AIIMS Biology Mock Test - 6


60 Questions MCQ Test AIIMS Mock Tests & Previous Year Papers | AIIMS Biology Mock Test - 6


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Attempt AIIMS Biology Mock Test - 6 | 60 questions in 60 minutes | Mock test for NEET preparation | Free important questions MCQ to study AIIMS Mock Tests & Previous Year Papers for NEET Exam | Download free PDF with solutions
QUESTION: 1

An important feature of Arthropoda is

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QUESTION: 2

The pelvic girdle of birds is attached to a complex structure formed by the fusion of last thoracic all lumbar and first caudal vertebrae called

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QUESTION: 3

Volkman's canals, connecting haversian canal to other haversian canal, are found in

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QUESTION: 4

In the following question, a statement of Assertion(A) is given followed by a corresponding statement of Reason(R).
Read the statements carefully, and mark the correct answer.
Assertion(A): Light is very important external factor of transpiration.
Reason(R): Light induces stomatal opening and darkness stomatal closure. Thus the rate of transpiration increased in light and decreases in dark.

Solution:

Light is a direct factor affecting the rate of transpiration. This plays a very important role in opening and closing of stomata which in turn controls the transpiration. In the majority of plants stomata open in the presence of light and close in darkness. A strong light increases transpiration probably due to its heating effect. As most of the transpiration occurs through stomata, the rate of transpiration falls down in the darkness.

QUESTION: 5

In the following question, a Statement of Assertion (A) is given followed by a corresponding Reason(R) just below it.Read the Statement carefully and mark the correct answer-
Assertion(A): Retenone is an extremely toxic insecticide.
Resaon (R): Retenone interrupts electron transport chain in the cells of insect body.

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QUESTION: 6

In the following question, a statement of Assertion(A) is given followed by a corresponding statement of Reason(R).
Read the statements carefully, and mark the correct answer.
Assertion(A): Study of biology requires basic knowledge of chemistry and physics.
Reason(R): Living organisms are made up of atoms and molecules which follow chemical and physical laws.

Solution:

The field of biology is getting advanced day by day to such an extent that basci knowledge of physics, chemistry and other sciences is necessarily required.All the living organisms are made up of atoms and molecules which follow certain laws associated with them. Therefore it becomes essential to have the knowledge of chemical and physical sciences also.

QUESTION: 7

In the following question, a statement of Assertion(A) is given followed by a corresponding statement of Reason(R).
Read the statements carefully, and mark the correct answer.
Assertion(A): Chromosomal aberrations are caused by a break in the chromosome or its chromatid.
Reason(R): Duplication, deficiency, transversion and translocations are the result of chromosomal aberrations.

Solution:

Chromosomal aberrations are disruptions in the normal chromosomal content of a cell, and are a major cause of genetic conditions in humans, such as Down syndrome. Strucural changes are caused by break in the chromosome or chromatid and can be of following types: (i) deficiency, involves loss of a part of chromosome, (ii) duplication, involves addition of a part of chromosome, (iii) inversion involves a reverse order of the genes in a part of chromosome and (iv) translocation, involves exchange of segments between non-homologous chromosomes.

QUESTION: 8

In the following question, a Statement of Assertion (A) is given followed by a corresponding Reason(R) just below it.Read the Statement carefully and mark the correct answer-
Assertion(A): High concentration of auxin inhibits root and shoot growth.
Reason (R): Ethylene is produced in high auxin concentration.

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QUESTION: 9

In the following questions, a statement of Assertion (A) is given followed by a corresponding Reason (R) just below it. Read the statements carefully and mark the answer-
Assertion (A): Lysosomes show stability in the living cell.
Reason (R): Lysosomal membrane is not digested by the lysosomal enzymes

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QUESTION: 10

In the following question, a statement of Assertion(A) is given followed by a corresponding statement of Reason(R).
Read the statements carefully, and mark the correct answer.
Assertion(A): Cattle breeds can be improved by superovulation and embryo transplantation.
Reason(R): Superovulation in high milk-yielding cows is induced by hormonal injection.

Solution:

Superovulation is an effort to increase the fertility of cattle breeds. Inducing an animal to ovulate multiple oocytes can translate into producing more offsprings from selected females. Superovulation and embryo transfer involves -Donor cows of particularly fine pedigree are treated with hormones to increase the number of eggs released at ovulation - multiple ovulation (MO), The cows are artificially inseminated using semen from a proven bull; After 6-7 days the embryos are flushed out non-surgically, using a catheter placed into the uterus. This is possible because, in cattle, there is a delay in embryos becoming implanted in the uterine wall. On average, 4-7 embryos are collected; The embryos may then be implanted into recipient cows whose oestrous cycle is at the correct receptive stage - usually as the result of hormonal manipulation; Embryos may be frozen and stored, using techniques similar to those applied to semen, (though precise control of the regime is somewhat more critical).Farmers may, of course, buy-in embryos from sources anywhere in the world to transfer to their own recipient cows. Embryo transfer has the potential to bring about genetic improvement twice as fast as AI alone.

QUESTION: 11

In the following question, a Statement of Assertion (A) is given followed by a corresponding Reason(R) just below it.Read the Statement carefully and mark the correct answer-
Assertion(A): Ginger has a prostrate growing rhizome.
Reason (R): Shoot growth is not affected by gravity.

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QUESTION: 12

In the following question, a statement of Assertion(A) is given followed by a corresponding statement of Reason(R).
Read the statements carefully, and mark the correct answer.
Assertion(A): Use of fertilizers greatly enhances crop productivity.
Reason(R): Irrigation is very important in increasing crop productivity.

Solution:

The direct application of fertilizers to crop or soils is a simple route to increase crop yield.Average yield per hectare has increased from 1.1 tons in 1950 to 2.3 tons in 1986 by the use of inorganic fertilizers.
Irrigation is very important in increasing crop productivity as water is an essential component of vital activities of a plant.

QUESTION: 13

In the following question, a Statement of Assertion (A) is given followed by a corresponding Reason(R) just below it.Read the Statement carefully and mark the correct answer-
Assertion(A): Cytokinins are antisenescent.
Reason (R): Effect of cytokinins is antagonistic of ethylene.

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QUESTION: 14

In the following question, a statement of Assertion(A) is given followed by a corresponding statement of Reason(R).
Read the statements carefully, and mark the correct answer.
Assertion(A): Pollution is always caused by human activites.
Reason(R): Pollution is not different from contamination.

Solution:

Pollution is an undesirable change in thephysical, chemical or biological characteristics of our air, water and land that may or will harmfully affect human lives or other organism. Pollution can be natural or man made. Natural pollution comes from volcanic reuptions, emission of natural gas, soil erosion, ultraviolet rays, etc. Most of the pollution is man-made. Contamination occurs due to the presence of harmful organisms or their porducts or undesirable porducts in a desirable product causing disease or discomfort, for the organism who consume it. Therefore pollution and contamination are two different things.

QUESTION: 15

In the following question, a Statement of Assertion (A) is given followed by a corresponding Reason(R) just below it.Read the Statement carefully and mark the correct answer-
Assertion(A): Flower of racemose inflorescence are pollinated by insects.
Reason (R): In racemose head inflorescence, the floretes are arranged in a centripetal fashion.

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QUESTION: 16

In the following question, a Statement of Assertion (A) is given followed by a corresponding Reason(R) just below it.Read the Statement carefully and mark the correct answer-
Assertion(A): In caducous plants, leaves are never formed.
Reason (R): In deciduous plants, all leaves fall together.

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QUESTION: 17

In the following question, a statement of Assertion(A) is given followed by a corresponding statement of Reason(R).
Read the statements carefully, and mark the correct answer.
Assertion(A): Soil particles, particularly clay and organic matter in soil, contain negative charges that attract positively-charged ions such as Ca++, K+ and Mg++.
Reason(R): This attraction keeps these ions at a soil level where they are available to plants.

Solution:

Minearal matter occurs in the form of particles in soil. The particels are irregular in outline and enclose spaces for circulation of air and water. Depending upon their size, mineral particles of the soil are called sand, slit and clay. Clay particles are chemically active. Water and chemical nutrients are abundant. Soil is the source of a number of essentail elements to the plnats. They are called plant nutrients or essential mineral elements.

QUESTION: 18

In the following questions, a statement of Assertion (A) is given followed by a corresponding Reason (R) just below it. Read the statements carefully and mark the answer-
Assertion (A): Smooth endoplasmic reticulum is also called a granular endoplasmic reticulum.
Reason (R): SER contains ribophorins.

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QUESTION: 19

In the following question, a statement of Assertion(A) is given followed by a corresponding statement of Reason(R).
Read the statements carefully, and mark the correct answer.
Assertion(A): Agricultural output increased several tims after introduction of DDT.
Reason(R): DDT was the first insecticide used on a wide scale.

Solution:

DDT or dichloro-diphenyl trichloroethane was the first important synthetic pesticide discovered in 1939 by a Swiss chemist Paul Muller. It was toxic to wide range of insect pests yet appeared to have low toxicity to mammals. It was persistent which means it do not break down rapidly in the environment, so that it did not have to be reapplied often. DDT was so effective at killing pests and thus boosting crops yield and was so inexpensive to make that its use quickly spread over the globe. Farmers used more and more DDT throughout the 1950 and 1960 to get an increased yield of crop.

QUESTION: 20

In the following question, a statement of Assertion(A) is given followed by a corresponding statement of Reason(R).
Read the statements carefully, and mark the correct answer.
Assertion(A): Thick cuticle is mostly present in disease resistant plants.
Reason(R): Disease causing agents cannot grow on cuticle and cannot invade the cuticle.

Solution:

The transformation of cellulose or pectic substances of the primary or secondary wall into cutin, which forms a continuous layer, called the cuticle. It generally forms the skin or outermost covering of the stem, leaves and some fruits. A thick cuticle layer serves as a barrier against fungal disease. Cuticle play a structural barrier and it contain substances of high wax content which the fungus finds difficult to penetrate.

QUESTION: 21

In the following question, a Statement of Assertion (A) is given followed by a corresponding Reason(R) just below it.Read the Statement carefully and mark the correct answer-
Assertion(A): Primary cambium is a lateral meristem.
Reason (R): Cork cambium is the secondary meristem.

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QUESTION: 22

In the following question, a statement of Assertion(A) is given followed by a corresponding statement of Reason(R).
Read the statements carefully, and mark the correct answer.
Assertion(A): Fruit juices taste bitter on being kept for some time.
Reason(R): Microorgnisms of the air spoil it quickely.

Solution:

Spoilage of fruit juice occurs due to fermetation. Fermetation is the major energy yielding process of several different microorganisms. They are capable of existing and breaking down organic compounds in the absence of oxygen.

QUESTION: 23

Polymer of α-D glucose is

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QUESTION: 24

The highest blood pressure in the aorta occurs when the

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QUESTION: 25

In eukaryotes the electron transport chain and enzymes of Krebs' or TCA cycle are found in-

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QUESTION: 26

Which ratio is constant for DNA ?

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QUESTION: 27

The following areas contain tonsils except which one?

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QUESTION: 28

The product of hybridization is known as

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QUESTION: 29

Which of the following plant seeds is used as jeweller's weight?

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QUESTION: 30

In the following question, a statement of Assertion(A) is given followed by a corresponding statement of Reason(R).
Read the statements carefully, and mark the correct answer.
Assertion(A): Gram-negative bacteria do not retain the stain when washed with alcohol.
Reason(R): The outer face of the outer membrane of Gram-negative bacteria contains lipopolysaccharides, a part of which is integrated into the membrane lipids.

Solution:

The Gram staining technique was discovered by Christian Gram.The cell wall of gram+ve bacteria contains both horizontal and vertical peptide linkages due to which mesh is dense and stain does not come out.But the cell wall of gram-ve bacteria has either horizontal or vertical peptide linkages, due to which mesh is loose and hence stain comes out when washed with alcohol.

QUESTION: 31

The cultivation of rice in India was originated in

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QUESTION: 32

Homo sapiens is included under the order

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QUESTION: 33

During translation initiation in prokaryotes, GTP is required for

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QUESTION: 34

DNA duplication or multiplication is known as

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QUESTION: 35

Lethal genes are

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QUESTION: 36

Which would result in haemolysis in foetus ?

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QUESTION: 37

Which is involved in body defence?

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QUESTION: 38

T-lymphocytes mature in

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QUESTION: 39

A disease transferred from mother to child through placenta is

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QUESTION: 40

Edward Jenner discovered

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QUESTION: 41

In Banana (musaceae) the inflorescence is

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QUESTION: 42

The smallest living cells without cell wall are

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QUESTION: 43

The difference in Gram-positive and Gram-negative bacteria is due to

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QUESTION: 44

Sink is related to

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QUESTION: 45

Which of the following will occur as a result of parasympathetic nervous system stimulation?

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QUESTION: 46

Formation of ATP in photosynthesis and respiration is an oxidation process which utilises the energy from

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QUESTION: 47

Maximum solar energy is trapped by

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QUESTION: 48

Technique for production of disease free plants is

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QUESTION: 49

Protoxylem is towards pith and metaxylem towards periphery. xylem is

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QUESTION: 50

 How many sperms are formed from a secondary spermatocyte? (AIIMS, 2008)

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QUESTION: 51

Simplest amino acid is

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QUESTION: 52

Bordered pits are found in

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QUESTION: 53

Monocarpic plant means

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QUESTION: 54

The carbon dioxide produced by a developing fetus is removed by the

Solution: Coz.. placenta is the connecting link b/w mother and foetus.
QUESTION: 55

Which hormone triggers the release of the egg from the developing follicle?

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QUESTION: 56

The pleural membranes begin to expand and stretch when

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QUESTION: 57

Which of the following molecules moves regularly from the nucleus to the cytoplasm ?

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QUESTION: 58

Rearing of bees is

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QUESTION: 59

Atlas vertebra of man is characterized by the presence of

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QUESTION: 60

In which condition gene ratio remains constant in a species

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