NSMQ TRUE OR FALSE PAST QUESTION (BIOLOGY).

Contest

The fibrous root system is assumed to have evolved before the taproot system in evolutionary history.

True

Plants with fibrous root systems usually have leaves with parallel venation.

True

The fibrous root system begins as a tap root from the radicle, but as the plant grows, the radicle degenerates, and no primary root is seen

True

The complete process of spermatogenesis occurs in different stages that take place in different structures within the male reproductive system.

True

Spermatogenesis in males start before the birth of the male child

False

Spermatogenesis is a continuous process that begins with puberty and continuous until death.

True

Contest

Amphibians have a narrower range of color spectrum whereas reptiles have a wider range of the color spectrum.

True

Reptiles tend to secrete highly toxic substances on their skin for protection against predators whereas amphibians have hard scales all over the skin for protection.

False

Amphibians undergo metamorphosis whereas reptiles do not experience any larval stages.

True

Contest

Mosses, algae, lichens and other lower organisms adapted to dry habitats always have cells with large volume

False

Buds of higher plants are completely devoid of vacuoles and are quite resistant to drought.

True

The characteristics of the cells of xerophytic plants are that they are relatively small in size with small vacuoles.

True

Contest

Plants with evergreen leaves whose epidermis is heavily cutinized or with waxy cell walls show greater resistance of desiccation under conditions of extreme soil dryness.

True

In angiosperms, reproductive organs are more sensitive to drought than vegetative organs

True

One of the most important adaptations of true xerophytes is the production of extensive root system in proportion to shoot system.

True

Contest

The most abundant lipid which is present in the plasma membrane is a phospholipid which contains a polar head group attached to two hydrophobic fatty acid tails.

True

The peripheral proteins in the plasma membrane function as to provide fluidity as well as mechanical support to the structure of the cell.

True

The plasma membrane generates and distributes signals in and outside of the cell for the proper functioning of the cell and all the organelles.

True

Contest

Heterotrophs make up the decomposers in the food chain that feed on the dead and decaying biomass in the environment.

True

Autotrophs obtain the reduced organic compounds from heterotrophs and oxidize them to produce energy.

False

Animals make up the most important group of heterotrophs in the environment as these occupy the maximum number of trophic levels in the food chain.

True

Contest

The most prominent function of platelets is to initiate blood coagulation,

True

Platelets are the most abundant cells in mammalian blood

False

Platelets are anucleated cells and thus do not have any nucleus

True

Contest

Pollen grains undergo dehydration to reduce their mass so that they can be easily moved from one flower to another.

True

Pollination is an internal process occurring inside the parts of the plants.

False

Pollination is a genetic and biochemical process.

False

Contest

Anaerobic respiration is comparatively longer than aerobic respiration

False

Complete oxidation of carbohydrates takes place during anaerobic

False

There is an exchange of gases during aerobic respiration where oxygen is released, and carbon dioxide is.

False

Contest

Gymnosperms are the flowering plants that are the largest and most diverse groups of plants in the kingdom Plantae.

False

Gymnosperms do not have stigma and style.

True

In Gymnosperms, the primary mode of dispersion is animals

False

Contest

Indicate whether the following statements are true or false with respect to the DNA molecule

It is formed in the nucleolus, and then moves to specialized regions of the cytoplasm depending on the type of DNA formed

False

DNA is more versatile than RNA, capable of performing numerous, diverse tasks in an organism

False

DNA’s mutation rate is relatively lower than that of RNA

True

Contest

Oxygen levels are higher in arterial blood than venal blood

True

The walls of arteries are much stronger and rigid than that of veins

True

Arteries contain valves to help keep blood flowing in the right direction

False.

Contest

The scapula is part of the pectoral girdle

False

The scapula is part of the pelvic girdle

False

The scapula is part of the appendicular skeleton

True

Contest

For growth to occur in organisms, the rate of food storage must be low

False

For growth to occur in organisms, the rate of catabolism must exceed that of anabolism

False

For growth to occur in organisms, the rate of anabolism must be equal to that of catabolism

False

Contest

In a food chain, each succeeding level in a forward direction represents a decrease in the number of individuals

True

In a food chain, each succeeding level in a forward direction represents a loss in the total energy being transferred

True

In a food chain, each succeeding level in a forward direction represents a decrease in the biomass of individuals

True

Contest

Indicate whether the following are true or false with respect to the offspring of a cross between an albino female and a genetically normal male.

All albino

False

All are genetically normal

False

Half albino and half normal

False

Contest

Plants are the only known organisms that possess cell wall

False

Certain prokaryotes, algae, slime moulds, water moulds, and fungi also have cell walls

True

Unlike those of plants and algae, fungal cell walls lack cellulose entirely and contain chitin

True

Contest

Eutrophic water resources usually harbour fewer larger organisms like fishes and birds when compared to non-eutrophic waters.

True

Although eutrophication is commonly caused by human activities, it can also be a natural process.

True

Natural eutrophication is often a much more rapid process than anthropogenic or cultural eutrophication

False

Contest

In the internal structure of plants, a wide pith in the centre is common to dicot stems and monocot stems

False

In the internal structure of plants, a wide pith in the centre is common to dicot roots and monocot roots

False

In the internal structure of plants, a wide pith in the centre is common to dicot roots and monocot stem

False

Contest

Indicate whether the following are true or false with regard to respiratory system of humans.

Humidifies the air

True

Warms up the air

True

Removes pathogens from the air

False

Contest

In Angiosperms, the dominant stage is diploid

True

In ferns, the dominant stage is diploid.

True

In Bryophytes, the dominant stage is diploid

False

Contest

Plants hybridize much more frequently and successfully than animals do.

True

Offspring produced by hybridization may be fertile, partially fertile, or sterile.

True

Hybridization is the process of interbreeding between individuals of different species (interspecific hybridization) or genetically divergent individuals from the same species (Intraspecific hybridization)

True

Contest

Comparative anatomy requires the use of carbon dating to prove that evolution has occurred

False

Biochemical similarities in organisms require the use of carbon dating to prove that evolution has occurred

False

Fossil records require the use of carbon dating to prove that evolution has occurred

True

Contest

Homozygous alleles produce only one type of gamete

True

Homozygous individuals are seldom pure and produce different genotypes on selfing

False

Homozygous individuals can carry either dominant or recessive alleles, but not both.

True

Contest

Hibernation is a state of inactivation in mature endothermic

False

Hibernation is characterized by low body-temperature, slow breathing and heart-rate, and low metabolic rate

True

Hibernation functions to conserve energy when sufficient food is not available.

True

Contest

Dinoflagellates are multicellular algae with protective covering

False

Dinoflagellates are found in both freshwater and marine ecosystems.

True

Some dinoflagellates are toxic and responsible for red tides and outbreaks of shellfish poisoning

True

Contest

Climax communities are poor colonizers but good competitors

True

Climax communities are responsible for soil formation, and modifies the environment favouring colonization.

False

Climax community is a stable community where invasion of other species will not generally happen for a long period.

True

Contest

The exposure to carbon monoxide is harmful to animals because it reduces carbon dioxide transport

False

The exposure to carbon monoxide is harmful to animals because increases carbon dioxide transport

False

The exposure to carbon monoxide is harmful to animals to because it reacts with oxygen to produce poisonous compounds.

False

Contest

Indicate whether the following are true or false with respect to secondary succession.

Numerous intermediate communities are formed during primary succession

False

The pioneer species of secondary succession enter the ecosystem from the outside environment

False

It is initiated either due to a biological factor or an external agent.

False (external factor)

Contest

Animals are multicellular, eukaryotic organisms, which are heterotrophic, meaning they obtain nutrition from inorganic sources

False

Most animals are diploid, meaning they have two copies of all genetic information for most of their life cycle.

True

Animal cells are characterized by their lack of a rigid cell wall exhibited by fungi and plants.
True

Contest

Sepals and petals are two types of reproductive structures in a flower.

False

Sepals and petals are responsible for protecting the reproductive structures of a flower.

True

Petals are green in colour while Sepals have bright colours.

False

Contest

Indicate whether the following are true or false with respect to the functions of the respiratory system of mammals.

It humidifies the air

True

It removes all disease causing microorganisms

False

It cools the air

False

Contest

Under the Linnaean classification system, plants and animals are sorted into groups based on number and size

False

Under the Linnaean classification system, plants and animals are sorted into groups based on form and size

False

Under the Linnaean classification system, plants and animals are sorted into groups based on form and structure.

True

Contest

State whether the following are true or false with respect to the countercurrent flow of water and blood in the gills of fishes.

It allows blood and water to flow in the same direction

False

It hampers the diffusion of oxygen and carbon dioxide between the blood and water

False

It results in uneven supply of oxygen reaching the blood vessels in the gills

False

Contest

The Law of segregation describes the behaviour of homologous

False

The Law of independent assortment describes the behaviour of alleles.

True

The law of segregation is the second law of Mendelian inheritance.

False

Contest

In most the monocotyledonous plants, the radicle elongates to form the primary root that grows into the soil.

False

In monocotyledonous plants, the primary root gives out lateral roots of several orders, which are referred to as secondary roots and tertiary roots

False

In monocotyledonous plants, the primary root does not live long and gets replaced by a large number of roots.

True

Contest

Indicate whether the following are true or false with respect to heartbeat of mammals.

It is the rhythmic contraction and relaxation in aorta and its main arteries

False

It is regulated by the nervous and endocrine systems

True

It is initiated in the pacemaker regions and spreads to the rest of the heart through a conduction pathway.

True

Contest

The stomach is the organ where the digestion of protein begins.

True

The small intestine is the place where digestion of protein ends.

True

Gastric juice consists of hydrochloric acid, mucus, rennin and pepsinogen

True

Contest

Crossing over refers to the tendency of genes on a chromosome to remain.

False

Crossing over helps to maintain a newly improved variety.

False

The frequency of crossing over between two genes increases when they are closely placed.

False

Contest

Primary consumers are the animals that feed on primary producers.

True

Primary consumers occupy the second trophic level of the energy pyramid

True

Primary consumers have the highest amount of biomass in a food chain

True

Contest 21b

Both echinoderms and chordates develop a true body cavity known as coelom.

True

Echinoderms exclusively live in marine habitats but chordates live in all biomes

True

The adult forms of echinoderms show radial symmetry while chordates show bilateral symmetry.

True

Contest

Mammals are warm-blooded animals, maintaining their body temperature independent from the external environment through their endothermic metabolism

True

Mammals and amphibians represent two classes of the phylum Chordata.

True

Amphibians have several vertebrae, allowing the head to move in a wide range, but the neck of mammals consists of a single vertebra, limiting the head movement.

False

The main nitrogenous waste of amphibians and mammals is urea

False

Contest

Ligaments connect muscle to muscle

False

Ligaments connect bone to tendon

False

Ligaments connect muscle to tendon

False

Ligaments connect bone to muscle

False

Contest

Hypogynous and epigynous flower are two types of flowers classified based on the level of the flower stalk

False

Hypogynous flower refers to the flowers having the floral parts, such as sepals, petals, and stamens, borne on the receptacle beneath the ovary while epigynous flowers refer to the flowers having the floral parts, attached to or near the upper part of the ovary.

True

The main difference between hypogynous and epigynous flower is that the hypogynous flowers have an inferior ovary while epigynous flowers have a superior ovary.

False

A hypogynous flower contains a convex or conical receptacle while the epigynous flower contains a flask-shaped receptacle.

True

Contest

The primary function of bone marrow is mineral storage

False

The primary function of bone marrow is detoxification of compounds

False

The primary function of bone marrow is protection

False

The primary function of bone marrow is blood cell production

False

Contest

In mammals, the bronchi are tubes in the lungs which branch off from the larger bronchiole that enter each lung.

False

Bronchioles are small airways in the respiratory tract, and lead directly to the alveolar ducts which house the alveoli responsible for exchanging gases with the blood

True

The bronchioles carry carbon dioxide rich air into the lungs and carry out oxygen rich air of the lungs

False

Contest

Dominant genes are always expressed wherever they are present.

True

A dominant gene will overpower all other genes to be the only one expressed.

False

Two dominant genes can be expressed together in a situation of co-dominance.

True

Contest

Indicate whether the following statements are true or false with respect to the mammalian eye

The rods detect colour, whereas cones detect only shades of gray.

False

When light enters the retina, it passes the ganglion cells and bipolar cells before reaching photoreceptors at the rear of the eye.

True

The cornea is a protective layer on the front of the eye.

True

Contest

A person of ‘O’ blood group has anti ‘A’ and anti ‘B’ antibodies in his blood plasma.

True

A person of ‘B’ blood group can’t donate blood to a person of ‘A’ blood group

True.

Blood group is designated on the basis of the presence of antibodies in the blood plasma.

True

Contest

Indicate whether the following are true or false with respect to events observed during mitosis

Chromatin condensation

True

Movement of centrioles to opposite poles

True

Crossing over

False

Contest

Tight junctions are connections that allow for the direct passage of molecules between two cells.

False (Gap junctions)

Gap junctions consist of a number of transmembrane channels called pores that are found in a closely packed arrangement

True

Depending on the type of gap junction in question, molecules can pass evenly in both directions, or asymmetrically.

True

Contest

A conjoint and open vascular bundle will be observed in the transverse section of Monocot root

False

A conjoint and open vascular bundle will be observed in the transverse section of Monocot stem

False

A conjoint and open vascular bundle will be observed in the transverse section of Dicot root.

False (Ans. Dicot stem)

Contest

Indicate whether the following statements are true or false during the cardiac cycle of the mammalian heart.

The volume of blood pumped out by the right and left ventricles is different.

False

The volume of blood received by each atrium is different.

False

The volume of blood received by the aorta and pulmonary artery is different.

False

Contest

The cytoskeleton aids in cell division

True

The cytoskeleton organizes the cell and keeps the cell’s organelles in place

True

The cytoskeleton aids in the movement of organelles throughout the cell.

True

Contest

Codominance and incomplete dominance are examples of non Mendelian inheritance

True

Codominance occurs when the phenotype is intermediate to the phenotype of the parents

False

In non-Mendelian inheritance, the resulting phenotype of the offspring is different from the phenotypes of either parent.

True

Contest

The Head of humerus bone articulates with acetabulum of pectoral girdle

False

The Head of humerus bone articulates with a cavity called acetabulum of pelvic girdle.

False

The head of humerus bone articulates with a glenoid cavity of pelvic girdle.

False

Contest

Fibres are likely to be absent in secondary phloem

False

Fibres are likely to be absent in secondary xylem

False

Fibres are likely to be absent in primary phloem

False

Contest

In an open circulatory system, the blood is not enclosed in blood vessels but is pumped into a cavity called a hemocoel.

True

An open circulatory system uses as much energy as a closed system to operate.

False

Arthropods, including insects, crustaceans, and most mollusk have an open circulatory system

True

Contest

Indicate whether the following are true or false with respect to the fate of primary xylem in a dicot root showing extensive secondary grow.

It gets surrounded by primary phloem

False

It may or may not get crushed

False

It is retained in the centre of the axis

True

Contest

When a bright light shines in the eye of humans the radial fibres in the iris contract.

False

When a bright light shines in the eye of humans, impulses travel in the optic nerve

True

When a bright light shines in the eye of humans, the pupil becomes larger.

False

Contest

Indicate whether the following statements are true or false with respect to the cause of the blind spot in the field of vision

There are no nerves in the blind spot

False

The image is not formed on the blind spot

False

There are no sensory cells in the blind spot

True

Contest

Indicate whether the following arrangements are true or false with respect to the correct sequence of events of fungal sexual cycle

Karyogamy, Plasmogamy and Meiosis

False

Meiosis, Plasmogamy and Karyogamy

False

Plasmogamy, Karyogamy and Meiosis

True

Contest

Indicate whether the following are true or false with respect to cells in which mitosis is unlikely to occur.

A sperm cell

True

An epithelial cell of a villus

False

A hair cell

True

Contest

When a protein-digesting enzyme is mixed with starch solution glucose will be produced

False

When a protein-digesting enzyme is mixed with starch solution amino acids will be produced

False

When a protein-digesting enzyme is mixed with starch solution it will digest the starch

False

Contest

Transpiration draws dissolved salts up the stem of plants

True

Transpiration draws food up the stem of plants

False

Transpiration speeds up photosynthesis in flowering plants

False

Contest

The tissues of marine fishes are hypotonic to their environment

True

Marine fishes lose water to the environment primality through their gills

True

Marine fishes must prevent a potential increase in the volume of their cells.

False

Contest

Food can travel up or down the stem in the xylem.

False

Food can travel up the stem in the phloem.

True

Food can travel down the stem in the phloem.

True

Contest

Indicate whether the following statements are true or false with respect to the effect of antidiuretic hormone on the nephron.

It increases water permeability of the descending limb of the loop of Henle.

False

It decreases water permeability of the collecting ducts.

False

It decreases water permeability of the descending limb of the loop of Henle

False. (It increases water permeability of the collecting ducts).

Contest

An anticodon is a sequence of three nucleotides forming a unit of genetic code in an RNA molecule that signals the termination of translation

False

An anticodon is a sequence of three nucleotides forming a unit of genetic code in an RNA molecule that signals the start of translation

False

An anticodon is a sequence of three nucleotides forming a unit of genetic code in a transfer RNA molecule, corresponding to a complementary codon in messenger RNA.

True

Contest

State whether the following are true or false with respect to the reason why carbohydrate loading increases the performance of long distance athletes.

It increases fat storage

False

It increases fatty acid levels in the blood

False

It increases the blood’s capacity to deliver oxygen

False

Contest

Nitrification is an anerobic process that occurs in soil by various aerobic microorganisms like bacteria and some archaea

False

Nitrifying bacteria play an important role in wastewater treatment where different nitrogen compounds are converted into nitrates and then nitrogen before removing the gas out of the water.

True

Nitrification is a process consisting of reduction

False

Contest

Indicate whether the following are true or false with respect to flowering plants having elaborate mechanisms to prevent pollen from the same individual from germinating on its own female reproductive parts.

To prevent double fertilization and the formation of endosperms.

False

To prevent the fertilization of one egg inside of an ovule. with multiple pollen tube cells that result in the formation of an embryo with abnormal sets of chromosomes

False

To prevent cross-species fertilization and production of dysfunctional hybrid offspring.

True

Contest

In humans, a decrease in temperature promotes the release of oxygen from the haemoglobin

False

In humans a decrease in carbon dioxide promotes the release of oxygen from the haemoglobin

False

In humans a decrease in carbonic anhydrase promotes the release of oxygen from the haemoglobin

False

Contest

Self-pollination is the more advantageous of the two types of pollination since it provides species with greater genetic diversity.

False

Maturation of pollen and ovaries at different times and heterostyly are methods plants have developed to avoid cross–pollination.

False

The placement of male and female flowers on separate plants or different parts of the plant are also barriers to self-pollination.

True

Contest

Indicate whether the following statements are true or false with respect to characteristics of capillary blood vessels.

They are repeatedly branched.

True

They have small diameter.

True

They are permeable to salts (ions)

True

Contest

When tracing blood flow through the human heart, it is usually easiest to start at the vena cavae.

True

Deoxygenated blood enters the right atrium through the superior and inferior vena cavae.

True

From the right atrium blood is pumped to the right ventricle and then to the pulmonary arteries, which carry it to the lungs for reoxygenation.

True

Contest

Indicate whether the following are true or false with respect to tracheid and vessel elements of angiosperms.

Only tracheid have a thick secondary wall containing lignin.

False

Only vessels have a thick secondary wall containing lignin

False

The end walls of tracheids are highly reduced or even absent, whereas the end walls of vessels retain their primary cell wall.

False

Contest

Closed circulatory systems are usually seen in invertebrate animals

False

Closed circulatory systems allow blood to flow in one direction

True

Most vertebrates and some invertebrates have a closed circulatory system.

True (some invertebrates, like this annelid earthworm, have a closed circulatory system)

Contest

The liver converts glucose in the blood to glycogen when there is release of adrenaline from the adrenal gland into the bloodstream

False (Adrenaline causes the liver to convert its glycogen store to glucose)

The skeletal muscles relax when there is release of adrenaline from the adrenal gland into the bloodstream

False

The rate and depth of breathing increases when there is release of adrenaline from the adrenal gland into the bloodstream

True

Contest

Indicate whether the following are true or false with respect to geotropism

Gravity sensing occurs in root hairs

False

Plants that grow in water do not respond to gravity

False

If plants are flipped upside down, they are not able to respond to gravity

False

Contest

As an animal gets larger, its surface area grows more rapidly than its volume

False

As an animal gets larger, its volume and surface area increase in perfect proportion

False

The greater the surface area-to-volume ratio of an animal, the more heat it loses relative to its volume.

True

Contest

Indicate whether the following are true or false with respect to why the quality of forested habitats decline when fragmented.

Trees on the edge of the fragments are frequently blown down

True

The edges of the forest are exposed to more sunlight, which increases temperature and decrease humidity

True

Weedy species from the deforested area invade the edge.

True

Contest

Indicate whether the following statements are true or false with respect to the nephron

The Bowman’s capsule surrounds the glomerulus.

True

The loop of Henle is between the proximal and distal convoluted tubules.

True

The loop of Henle empties into the distal convoluted tubule.

True

Contest

Indicate whether the following are true or false with respect to why island species are particularly vulnerable to extinction after human colonization.

They are relatively easy to hunt to extinction because their distribution is limited.

True

They are relatively easy to hunt to extinction, because their total population size is often small.

True

They often have a lot of predators that prey on several species.

False

Contest

Indicate whether the following statements are true or false with respect to the mammalian respiratory system.

When mammals breathe in, air travels from the pharynx to the trachea.

True

The bronchioles branch into bronchi.

False

Gaseous exchange between the lung and blood takes place in the alveolus.

True

Contest

Density dependent population regulation results when only birth rates change with respect to density.

False

Density dependent population regulation results when only death rates change with respect to density

False

Density dependent population regulation results when diseases spread in populations at all densities.

False

Contest

Indicate whether the following are true or false with respect to the human heart.

The walls of the right ventricle are thicker than the walls of the left ventricle.

False

Blood returns to the heart from the lungs in the vena cava.

False

The second heart sound is due the closing of the aortic valve.

True

Contest

Most marine invertebrates are osmoreguators.

False

Bony marine fishes are hypertonic osmoreguators

False

Mammals are hypotonic osmoregulators.

False

Contest

Indicate whether the following statements are true or false with respect to individuals that are homozygous for an allele.

They are true breeding with respect to the allele.

True

The parents were certainly homozygous for the allele

False

Each of their gametes contains one copy of the allele.

True

Contest

Some phagocytes travel in the circulatory system.

True

Lysosomes play an important role in the function of phagocytes.

True

Although phagocytes are important, an animal can do perfectly well without them

False

Contest

The tricuspid valve prevents backflow of blood from the pulmonary artery into the right ventricle

False

2. The tricuspid valve prevents backflow of blood from the right atrium into the left atrium.

False

3. The tricuspid valve prevents backflow of blood from the right atrium into the right ventricle

False

Contest

Indicate whether the following statements are true or false with respect to codominance

An individual’s parents have blood types A and B, and the individual has AB blood type.

True

A child of a parent with blue eyes and a parent with brown eyes, and has brown eyes.

False

A cross between two plants that produce a yellow and a blue flower, and the flowers produced by the progeny plants are either yellow with blue spots or blue with yellow spots.

True

Contest

Indicate whether the following statements about the kidney are true or false.

The cortex covers the capsule.

False

The renal pelvis drains into the ureter.

True

Nephrons are in the renal cortex.

True

Contest

Plants lose water (and turgor pressure) via transpiration through the stomata in the leaves and replenish it via negative pressure in the roots.

False

Positive pressure inside plant cells is contained by the cell wall, producing turgor pressure, which is responsible for maintaining the structure of leaves

True

The taller the plant, the taller the water column, and the more influential gravity potential becomes

True

Contest

DNA nucleotide differences between organisms indicate how closely organisms are.

True

DNA nucleotide differences between organisms indicate that evolution has occurred

True

DNA nucleotide differences between organisms explain why there are phenotypic differences

True

Contest

A vestigial trait is an attribute that has lost its function but has been retained through evolution.

True

A trait that makes an organism better suited for a habitat is an adaptation.

True

Structures that arise in organisms that share a common ancestor, but perform different functions are called homologous structures.

True

Contest

The plasma membrane provides the cell with structure, and separates the internal components of the cell from the environment outside of the cell

True

The plasma membrane is made up a single layer of phospholipids which has proteins and cholesterols throughout.

False

The plasma membrane contains integral membrane proteins that are only loosely attached to the lipid bilayer

False

Contest

Indicate whether the following are true or false with respect to the reasons why it is difficult to design a vaccine for viruses with high mutation rate such as the cold and flu viruses.