Biology

97 questions in Science & Technology.

Asked in 2002, 2001, 2000, 1999

2002 · Q11 Science & TechnologyBiologyeasy

Among living organisms, which one of the following is the most responsible factor for bringing about the origin of a new species?

(a)Isolation
(b)Mutation
(c)Natural Selection
(d)Sexual Reproduction

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Official answer(a) Isolation

2002 · Q25 Science & TechnologyBiologyeasy

Ticks and mites are actually

(a)Arachnids
(b)Crustaceans
(c)Insects
(d)Myriapods

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Official answer(a) Arachnids

2002 · Q26 Science & TechnologyBiologymoderate

With reference to the blood in a normal person, which one of the following statements is correct?

(a)Compared to arteries, veins are less numerous and hold less of the body’s blood at any given time
(b)Blood cells constitute about 70 % of the total volume of the blood
(c)White Blood Cells (WBC) are made by lymph nodes only
(d)The blood has more platelets than WBC

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Official answer(d) The blood has more platelets than WBC

2002 · Q32 Science & TechnologyBiologymoderate

Consider the following plants: 1. Bougainvillea 2. Carnations 3. Cocoa 4. Grapes Which of these plants are propagated by stem cuttings?

(a)1 and 2
(b)2, 3 and 4
(c)1, 3 and 4
(d)1, 2, 3 and 4

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Official answer(d) 1, 2, 3 and 4

2002 · Q43 Science & TechnologyBiologymoderate

In the context of the organic evolution, the loss of limbs of snakes is explained by the phenomenon of

(a)use and disuse of organs
(b)adaptation to living in burrows
(c)natural selection
(d)inheritance of acquired characters

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Official answer(a) use and disuse of organs

2002 · Q65 Science & TechnologyBiologymoderate

With reference to the human body, consider the following statements: 1. The production of somatotropin goes up when a person exercises. 2. Men’s testes produce progesterone. 3. Women’s adrenal glands secrete testosterone. 4. Stress causes the adrenals to release very little cortisol compared to usual. Which of these statements are correct?

(a)2 4 3 1
(b)1 3 4 2
(c)2 3 4 1
(d)1 4 3 2

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Official answer(d) 1 4 3 2

2002 · Q100 Science & TechnologyBiologyeasy

In a bisexual flower, if androecium and gynaecium mature at different times, the phenomenon is known as

(a)Dichogamy
(b)Herkogamy
(c)Heterogamy
(d)Monogamy

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Official answer(a) Dichogamy

2002 · Q127 Science & TechnologyBiologymoderate

Which one of the following statements is correct?

(a)All echinoderms are viviparous
(b)Round worm has no circulatory system
(c)In bony fishes, swim bladder is usually present
(d)In cartilaginous fishes, fertilisation is internal

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Official answer(a) All echinoderms are viviparous

2002 · Q141 Science & TechnologyBiologymoderate

Assertion (A): Drinking of whisky increases the frequency of urination. Reason (R): Alcohol intake speeds up the secretion of vasopressin in the body.

(a)Both A and R are individually true and R is the correct explanation of A
(b)Both A and R are individually true but R is not a correct explanation of A
(c)A is true but R is false
(d)A is false but R is true

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Official answer(c) A is true but R is false

2001 · Q123 Science & TechnologyBiologyeasy

Which of the following cell organelles play the most significant role in protein synthesis?

(a)Lysosome and Centrosome
(b)Endoplasmic reticulum and Ribosome
(c)Golgi apparatus and Mitochondria
(d)Lysosome and Mitochondria

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Official answer(b) Endoplasmic reticulum and Ribosome

2001 · Q125 Science & TechnologyBiologyeasy

The cellular and molecular control of programmed cell death is known as

(a)Apoptosis
(b)Ageing
(c)Degeneration
(d)Necrosis

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Official answer(a) Apoptosis

2001 · Q126 Science & TechnologyBiologyeasy

Which organelle in the cell, other than nucleus, contains DNA?

(a)Centriole
(b)Golgi apparatus
(c)Lysosome
(d)Mitochondrion

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Official answer(d) Mitochondrion

2001 · Q127 Science & TechnologyBiologyeasy

Epiphytes are plants which depend on other plants for

(a)food
(b)mechanical support
(c)shade
(d)water

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Official answer(b) mechanical support

2001 · Q128 Science & TechnologyBiologyeasy

Antigen is a substance which

(a)destroys harmful bacteria
(b)is used to treat poisoning
(c)lowers body temperature
(d)stimulates formation of antibody

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Official answer(d) stimulates formation of antibody

2001 · Q131 Science & TechnologyBiologyeasy

Match List I with List II and select the correct answer using the codes given below the Lists: List I (Bone) I. Breast-bone II. Collar-bone III. Knee-cap IV. Shoulder blade List II (Name) A) Clavicle B) Patella C) Scapula D) Sternum

(a)I-D, II-A, III-C, IV-B
(b)I-A, II-D, III-C, IV-B
(c)I-A, II-D, III-B, IV-C
(d)I-D, II-A, III-B, IV-C

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Official answer(d) I-D, II-A, III-B, IV-C

2001 · Q132 Science & TechnologyBiologymoderate

Consider the following statements: I. Tapeworm is a hermaphrodite. II. Round-worm has separate sexes. III. Filaria is caused by a nematode. IV. Guinea worm is an annelid. Which of these are correct?

(a)I and II
(b)I, II and III
(c)III and IV
(d)II, III and IV

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Official answer(b) I, II and III

2001 · Q136 Science & TechnologyBiologyeasy

A man whose blood group is not known meets with a serious accident and needs blood transfusion immediately. Which one of the blood groups mentioned below and readily available in the hospital will be safe for transfusion?

(a)O, Rh-
(b)O, Rh+
(c)AB, Rh-
(d)AB, Rh+

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Official answer(a) O, Rh-

2001 · Q138 Science & TechnologyBiologymoderate

Match List I with List II and select the correct answer using the codes given below the Lists: List I (Substance) I. Ptyalin II. Pepsin III. Renin IV. Oxytocin List II (Physiological role) A) Converts angiotensinogen in blood into angiotensin B) Digests starch C) Digests proteins D) Hydrolyses fats E) Induces contraction of smooth muscles

(a)I-B, II-C, III-A, IV-E
(b)I-C, II-D, III-B, IV-E
(c)I-B, II-C, III-E, IV-A
(d)I-C, II-A, III-B, IV-D

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Official answer(a) I-B, II-C, III-A, IV-E

2000 · Q116 Science & TechnologyBiologyeasy

At which stage in its life-cycle does the silkworm yield the fibre of commerce?

(a)Egg
(b)Larva
(c)Pupa
(d)Imago

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Official answer(c) Pupa

2000 · Q120 Science & TechnologyBiologymoderate

Match List I (Endocrine glands) with List II (Hormones secreted) and select the correct answer using the codes given below the Lists: List I I. Gonads II. Pituitary III. Pancreas IV. Adrenal List II A) Insulin B) Progesterone C) Growth hormones D) Cortisone Codes:

(a)I-C, II-B, III-D, IV-A
(b)I-B, II-C, III-D, IV-A
(c)I-B, II-C, III-A, IV-D
(d)I-C, II-B, III-A, IV-D

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Official answer(c) I-B, II-C, III-A, IV-D

2000 · Q123 Science & TechnologyBiologyeasy

The sensation of fatigue in the muscles after prolonged strenuous physical work is caused by

(a)a decrease in the supply of oxygen
(b)minor wear and tear of muscle fibres
(c)the depletion of glucose
(d)the accumulation of lactic acid

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Official answer(d) the accumulation of lactic acid

1999 · Q106 Science & TechnologyBiologymoderate

Match the hormones in List I with items in List II and select the correct answer using the codes given below the Lists: List I I. Adrenaline II. Estrogen III. Insulin IV. Pheromones List II A) Anger, fear, danger B) Attracting partners through sense of smell C) Females D) Glucose Codes:

(a)I-C, II-A, III-D, IV-B
(b)I-A, II-C, III-B, IV-D
(c)I-A, II-C, III-D, IV-B
(d)I-C, II-A, III-B, IV-D

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Official answer(c) I-A, II-C, III-D, IV-B

1999 · Q107 Science & TechnologyBiologyeasy

Neem tree has acquired industrial importance as a source of

(a)biopesticide and anti-fertility compound
(b)anti-fertility compound, biofertilizer and anti-cancer drug
(c)biofertilizer, biopesticide and anti-fertility compound
(d)anti-cancer drug, biopesticide and biofertilizer

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Official answer(a) biopesticide and anti-fertility compound

1999 · Q115 Science & TechnologyBiologymoderate

For which one of the following is capillarity not the only reason?

(a)Blotting of ink
(b)Rising of underground water
(c)Spread of water drop on a cotton cloth
(d)Rising of water from the roots of a plant to its foliage

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Official answer(b) Rising of underground water

1999 · Q122 Science & TechnologyBiologyeasy

When ants bite, they inject

(a)glacial acetic acid
(b)methanol
(c)formic acid
(d)stearic acid

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Official answer(c) formic acid