AIIMS Biology Mock Test - 7


60 Questions MCQ Test AIIMS Mock Tests & Previous Year Papers | AIIMS Biology Mock Test - 7


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This mock test of AIIMS Biology Mock Test - 7 for NEET helps you for every NEET entrance exam. This contains 60 Multiple Choice Questions for NEET AIIMS Biology Mock Test - 7 (mcq) to study with solutions a complete question bank. The solved questions answers in this AIIMS Biology Mock Test - 7 quiz give you a good mix of easy questions and tough questions. NEET students definitely take this AIIMS Biology Mock Test - 7 exercise for a better result in the exam. You can find other AIIMS Biology Mock Test - 7 extra questions, long questions & short questions for NEET on EduRev as well by searching above.
QUESTION: 1

Afferent nerve fibre carries impulses from

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QUESTION: 2

Haemoglobin containing red blood is absent in

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QUESTION: 3

'Birds are glorified reptiles'. This statement was made by:

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QUESTION: 4

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): Savannas show rich species diversity.
Reason (R): The biome is prone to fires.

Solution:
QUESTION: 5

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): 'Lac Operon Model' is applicable only to E.coli.
Reason(R): E.coli lacks a definite nucleus.

Solution:

In E. coli, synthesis of β galactosidase, an enzyme meant for hydrolysis of lactose into glucose and galactose, has been studied in considerable detail.
Lactose → β galactosidase glucose + galactose
If β galactosides (e.g., lactose) are not supplied to E. coli cells, the presence of β galactosidase is hardly detectable, but as soon as lactose in added, production of enzyme β galactosidase increases as much as 10,000 times. The enzyme quantity again fall down as quickly as the substance (i.e. lactose) is removed. Such enzymes, whose synthesis can be induced by adding, substrate are known as "inducible enzymes". F. Jacob and J. Monod in 1961, on the basis of their study on the inducible system for the synthesis of β galactosidase enzyme in E. coli, proposed a model in order to explain the induction or repression of enzyme synthesis. The model is popularly known as "operon model", E. coli like other bacteria has incipient nucleus, i.e. nucleoid.

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): Indiscriminate exploitation of economically important wild plants may lead to their extinction.
Reason(R): Non-conservation of their germplasm is responsible for this.

Solution:

In modern era a high yielding variety developed at one place is immediately distributed to all parts of the globe. Naturally the low yielding wild varities are discarded. The discarded wild varieties automatically disappear. They and their genes cannot be regained.

QUESTION: 7

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): Flowering in plants occurs only when the length of dark period is suitable.
Reason (R): The flowers are the receptors of the photoperiodic stimulus.

Solution:

Assertion is correct But reason is incorrect because receptors for photoperiodic stimulus are present at LEAVES.

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): Cytokinins are antisenescent.
Reason (R): Effect of cytokinins is antagonistic of ethylene.

Solution:
QUESTION: 9

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): Phloem translocates mostly carbohydrates.
Reason (R): Glucose is the most translocated carbohydrates.

Solution:
QUESTION: 10

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): Unisexual flowers have separate male and female flowers.
Reason (R): Both monoecious or dioecious plants have unisexual flowers.

Solution:
QUESTION: 11

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: 12

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): Helobial endoperms is found in monocots.
Reason (R): Two champers are formed in this endosperm.

Solution:
QUESTION: 13

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): Nitrogen-fixing bacteria in legume root nodules survive in oxygen-depleted cells of nodules.
Reason(R): Legheamoglobin completely removes oxygen from the nodule cells.

Solution:

Symbiotic nitrogenfixation occurs in lgume plants.It takes place in the Rhizobium bacteroids which are located within root nodules cells.Rhizobium is an aerobic bacteria and hence it survives in presence of oxygen. But the important enzyme nitrogenase that reduces N2 is oxygen sensitive. It can only function at low oxygen concentration. This low concentration of oxygen in bacteroid is provided by leghaemoglobin.
Leghaemoglobin is a form of haemoglobin found in the nitrogen fixing root nodules of legume.They bound oxygen and thus protect the nitrogen fixing enzyme, nitrogenase. It regulates oxygen diffusion to bacteroids and nitrogenase.

QUESTION: 14

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): Compound umbel is branched.
Reason (R): In compound umbel, both involucre and involucels are present.

Solution:
QUESTION: 15

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: 16

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): Hair cells on the basilar membrane (organ of Corti) are responsible for hearing.
Reason(R): Pressure waves, which begin at the oval windows, cause the basilar membrane to vibrate so that the cilia of the hair cells touch the tectorial membrane. This causes the hair cells to initiate nerve impulses, which are carried by the auditory nerve to the brain.

Solution:

Hair cells on the basilar membrane is responsible for hearing. In the cochlear duct of the internal ear, the basilar papila forms a basilar membrane with hair cells constituting an organ of Corti, the fibres are embedded in a tectorial membrane lying above the organ of Corti which is sensitive to vibrations of high freequency.
Pressure waves at oval window causes vibration in basialr membrane, which in turn creates vibrations in the cilia of hair cells touching tectorial membrane. This vibration initiates nerve impulse in auditory nerve, which sends this impulse to the brain.

QUESTION: 17

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.

Solution:
QUESTION: 18

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): Far-red light is used in lightbreak reaction.
Reason (R): The most effective wavelengths of light are 620 and 660 nm in including flowering.

Solution:
QUESTION: 19

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): The chalazal cells of the embryo sac are called antipodal cells.
Reason (R): They play nutritive role for embryo sac.

Solution:
QUESTION: 20

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): Phytoplankton is the pioneer stage of hydrosere.
Reason (R): Zooplankton appears after phytoplankton.

Solution:
QUESTION: 21

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): Virus-free plants can be produced from virus infected plants by means of meristems tissue culture.
Reason(R): The virus fails to grow during the growth of host tissue in the artificial medium.

Solution:

Pathogen free clones of plants can be obtained through shoot-tip culture because shoot apical meristem is usually free of the pathogens.The shoot tips are virus free also and as shoot tips are grown in artificial medium, virus cannot grow there. Virus can grow in host cells only.

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): Leguminous plants are best preferred for rotation of crops.
Reason(R): They have root nodules which have nitrogen fixing bacterium Clostridium.

Solution:

Usually non-leguminous crops like wheat, rice, millets etc. are rotated with leguminous crops gram , pea, pulses, beans, groundnut, alfalfa, clover, etc. Leguminous plants bear nodulated roots. The root nodules contain nitrogen fixing bacteria of the genus Rhizobium. The bacteria convert molecular nitrogen into salts of nitrogen. The later enrich the leguminous crop as well as soil. Therefore, crop rotation maintains the nitrogen fertility of the soil when legume crop is rotated with others.

QUESTION: 23

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: 24

Glucose is

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QUESTION: 25

Blockages in which of the following blood vessels reduces blood flow to the heart muscle?

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QUESTION: 26

Largest amount of phosphate bond energy is produced in the process of respiration during

Solution: A) Glycolysis...because in it.ATP is formed in it which contains high energy phosphate bond which on braking release energy.
QUESTION: 27

At the junction between the esophagus and the stomach, the epithelial lining changes abruptly from __________________ to _________________.

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QUESTION: 28

Radio tracer techniques show that DNA is in

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QUESTION: 29

Eucalyptus belongs to the family

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QUESTION: 30

A drug from the root of the following plant cures the mental disorders:

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QUESTION: 31

In which of the following, protonephridia or flame cells are the excretory structures? 
A. Platyhelminthes, Planaria
B. Cephalochordates, Amphioxus 
C. Rotifers and some annelids.

Solution:

In Platyhelminthes, the excretory system is consists of peculiar flame cells or protonephridia which are meant to excretion and osmoregulation. Ammonia is the chief excretory waste.

QUESTION: 32

The first fossil of African ape was discovered by

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QUESTION: 33

The term 'central dogma' was coined by

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QUESTION: 34

Reverse transcriptase is also known as

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QUESTION: 35

Pleiotropic gene has

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QUESTION: 36

Duchenne muscular dystrophy is a

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QUESTION: 37

Blood group O has

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QUESTION: 38

Antibodies are produced by

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QUESTION: 39

AIDS virus enters the human body through

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QUESTION: 40

Universal recipient blood group is

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QUESTION: 41

Beggiatoa

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QUESTION: 42

The ratio of female to male flowers is 1 : α. It is found in

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QUESTION: 43

Heterocysts, specialised for nitrogen fixation, occur in certain

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QUESTION: 44

Which one of the following categories of organisms do not evolve oxygen during photosynthesis ?

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QUESTION: 45

Sensory receptors initiate nerve impulses in

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QUESTION: 46

In which of the following process the light energy is convered into chemical energy

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QUESTION: 47

ATP formation in chloroplast and mitochondrion is explained by

Solution:

Chemiosmotic coupling hypothesis is the most widely accepted explanation for oxidative phosphorylation in mitochondria and photophos- phorylation in thylakoid membranes. Mitchell proposed the idea of chemiosmotic coupling.
He suggested that a concentration gradient of protons is established across the mitochondrial membrane because there is an accumulation of hydrogen ions on one side of the mitochondrial membrane. The proton accumulation is necessary for energy transfer to the endergonic ADP phosphorylation process.

QUESTION: 48

A person feels extremely thirsty, drinks large amount of water, feels tired and weak. These the are symptoms of

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QUESTION: 49

Which one contains only living cells ?

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QUESTION: 50

The tissue taking part in translocation of food is

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QUESTION: 51

The phenomenon, where the pollutants pass in higher concentrations through the food chains and accumulate to the maximum in the final consumer, is called

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QUESTION: 52

The storage protein is

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QUESTION: 53

Anemophillous flowers have

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QUESTION: 54

Cryptorchidism is a condition in which testes are

Solution:

Cryptorchidism is a congenital disorder when one or both of a newborn's testicles fail to descend into the scrotum. Although this condition may occur on both sides, it more commonly affects the right testis. Because the testicles normally descend into the scrotum during the eighth month of gestation, undescended testicles most commonly affect newborns

QUESTION: 55

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

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QUESTION: 56

The pleural membranes function to

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QUESTION: 57

Pelvic girdle of man consists of

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QUESTION: 58

Transcriptional control in eukaryotes may involve changes in :

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QUESTION: 59

Mammalia is a

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QUESTION: 60

Hexaploid Wheat developed through

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