pgt biology and Botany

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Free Biology Questions

Botany

1. Morphogenesis in plants is controlled by

(1) Auxins

(2) Gibberellins

(3) Cytokinins

(4) Abscisic acid

Ans. (4)

2. The non-auxin herbicide which is used to kill broad leaved plants in grass lawns is:

(a) Diquat

(b) Dinitrophenol

(c) Dalapon

(d) Dicamba

Ans. (c)

3. In tissue culture:

(a) Normal cells behave as cancer cell.

(b) Normal cells behave as normal cells

(C) Cancer cells behave as normal cells

(d) Cancer cells form callus

Ans. (a)

4. The plants of Cladophora crispata occur as:

(a) Epiphyte

(b) Endophyte

(c) Endozoic

(d) Epizoic

Ans. (d)

5. Which one of the following ratio is constant DNA of a species?

(a) A+T/G+C

(b) A+G/T+C

(c) A+C/T+G

(d) A+U/T+G

Ans. (a)

6. Mycorrhiza is:

(a) Association of root and bacteria

(b) Association of root and fungi

(c) Association of root and algae

(d) Parasitic root

Ans. (b)

Direction: In the following questions more than one of the answers given may be correct. Select the correct answers and mark it according to the code.

Codes:

(1) 1, 2 and 3 are correct

(2) 1 and 2 are correct

(3) 2 and 4 are correct ‘

(4) 1 and 3 are correct

7. Pollen tube of Cycas acts

(1) As an agent for carrying male. Gamete to the egg

(2) As a haustorium

(3) As endosperm

(4) As female cone

Ans. (2)

8. Which of the following conditions are necessary for the growth of the moulds, Mucor or Penicillium?

(1) Warmth

(2) Carbohydrate

(3) Water

(4) Light

Ans. (1)

9. Which of the following characteristics are associated with halophytes plants?

(1) Presence of pneumatophores

(2) Leaves and stem have hairy and waxy covering

(3) Shows viviparous germination

(4) Leaves show Heterophilly

Ans. (4)

10. The characteristic feature of leghaemoglobin are

(1) It is a source of energy

(2) It is a pinkish colour pigment found in nodules

(3) Activated by the presence of Mg²⁺ ions

(4) It protects nitrogen fixing enzyme nitrogenase from oxygen

Ans. (3)

11. Cyathium is characterized by

(1) Single female flower surrounded by many male flowers

(2) As involucres of bracts enclosing all the flowers

(3) Fleshy inflorescence axis with a pear shaped cavity inside

(4) Single male flower surrounded by many female flowers

Ans. (2)

12. Parietal placentation is found in the members of

(1) Family Cucurbitaceae

(2) Family Solanaceae

(3) Family Brassicaceae

(4) Family leguminosae

Ans. (4)

13. Which of the following is true regarding Guttation?

(1) Occurs through stomata

(2) Occurs through hydathodes

(3) Loss of pure water

(4) Occurs mostly during night and early morning

Ans. (3)

14. Which of the following statements are true for complementary genes?

(1) Both the genes interact to produce a complementary new trait

(2) Pair of nonallelic genes

(3) The F₂ ratio is generally 9: 7

(4) The F₂ ratio is generally 9: 3: 4

Ans. (1)

15. Coenzymes

(1) Act as a donor of groups of atoms added to the substrate

(2) Act as an acceptor of groups of atoms removed from the substrate

(3) Can not be easily separated from apoenzyme

(4) Do not act as prosthetic group

Ans. (2)

16. Suckers are

(1) Formed from the internodes of underground stem

(2) Formed from the node of underground stem

(3) Roots which are formed from the upper portion of nodes

(4) Roots which are formed from the lower portion of nodes

Ans. (3)

17. Non-cyclic photophosphorylation produces

(1) NADPH

(2) ATP and O₂

(3) ATP only

(4) O₂ only

Ans. (2)

18. C₄ pathway occurs

(1) Only in monocots

(3) In most of the dicats

(2) In monocots

(4) In few dicots

Ans. (3)

19. Link between glycolysis, Krebs’ cycle and ?-oxidation of fatty acid or carbohydrate and fat metabolism is

(1) Acetyl CoA

(2) A compound formed by oxidative de-carboxylation

(3) A 2-carbon compound

(4) oxaloacetic acid

Ans. (1)

20. The enzymes taking part in recombinant DNA technology are

(1) Restriction Endonuclease

(2) Ligase

(3) Reverse transcriptase

(4) Phosphates

Ans. (2)

21. The mode of asexual reproduction in bacteria are

(1) Formation of gametes

(2) Endospore formation

(3) Conjugation

(4) Zoospores formation

Ans. (3)

22. Acid rain is caused by

(1) Sulphur dioxide

(2) Hydrogen chloride

(3) Nitrogen oxides

(4) Phosphates

Ans. (1)

23. Censer mechanism is found in

(1) Aristolochia

(2) Antlrrhinum

(3) Papaver

(4) Cletnatis

Ans. (1)

24. Aerenchyma is present in which of the following plants?

(1) Neptunia

(2) Potamogeton

(3) Bryophyllum

(4) Vallesneria

Ans. (3)

25. One internodes long phylloclade is found in

(1) Ruscus

(2) Opuntia

(3) Asparagus

(4) Calotropis

Ans. (4)

Zoology

1. Lymphoid tissue is found in:

(a) Thymus

(b) Tonsils

(c) Lymph nodes

(d) All of these

Ans. (d)

2. Most widely used bioweapon is:

(a) Bacillus subtilis

(b) Pseudomonas putida

(c) Bacillus anthracis

(d) None of the above

Ans. (c)

3. The vitamin which is essential for blood clotting is

(a) Vitamin-A

(b) Vitamin-B

(c) Vitamin-C

(d) Vitamin-K

Ans. (d)

4. The female genital pore of Pheretima posthuma located upon the segment?

(a) 14^th

(b) 16^th

(c) 18^th

(d) 15^th

Ans. (a)

5. Polyp phase is absent in:

(a) Hydra

(b) Aurelia

(c) Physalia

(d) Obelia

Ans. (b)

6. In frog heart, there are cardiac muscles which consist of fibres called

(a) Purkinje fibres

(b) Myonemes

(c) Telodendria

(d) Columnae camae

Ans. (a)

7. Malpighian tubules are:

(a) Excretory organs of insects

(b) Excretory organs of frog

(c) Respiratory organs of insects

(d) Endocrine glands of insects

Ans. (a)

8. Pacemaker is:

(a) AV node

(b) SA node

(c) Bundle of His

(d) Purkinje fibres

Ans. (b)

9. LH and FSH are collectively called:

(a) Oxytocin

(b) Somatotrophins

(c) Luteotrophic

(d) Gonadotrophins

Ans. (d)

10. Who is known as “father of Endocrinology”?

(a) R.H. Whittaker

(b) Pasteur

(c) Einthoven

(d) Thomas Addison

Ans. (d)

11. Which of the following provides most evident proof of evolution?

(a) Fossils

(b) Morphology

(c) Embryo

(d) Vestigial organs

Ans. (a)

12. In Mollusca, eye is present over a stalk, called:

(a) Ostractum

(b) Operculum

(c) Ommatophores

(d) Osphradium

Ans. (c)

13. Among the following, colonial insects are:

(a) Locusts

(b) Mosquitoes

(c) White ants

(d) Bed bug

Ans. (c)

14. In Ascaris, the coelom is:

(a) Schizocoelom

(b) Pseudocoelom

(c) True coelom

(d) Haemocoelom

Ans. (b)

15. ‘Turbellarians’ are free living:

(a) Nematodes

(b) Cestodes

(c) Flat worms

(d) Trematodes

Ans. (c)

16. The characteristic larva of phylum ‘Coelenterata’ is:

(a) Planula

(b) Cysticercus

(c) Rhabdiform

(d) Wriggler

Ans. (a)

17. Podocytes are the cells, present in:

(a) Cortex of nephron

(b) Inner wall of Bowman4s capsule

(c) Outer wall of Bowman s capsule

(d) Wall of glomerular capillaries

Ans. (b)

18. In rabbit, head of epididymis present at the head of the testis is called:

(a) Vas deferens

(b) Cauda epididymis

(c) Gubernaculum

(d) Caput epididymis

Ans. (d)

19. Tendons and ligaments are specialized types of:

(a) Nervous tissue

(b) Muscular tissue

(c) Epithelial tissue

(d) Fibrous connective tissue

Ans. (d)

20. In blood, CO₂ is transported majorly as:

(a) Sodium carbonate

(b) Carboxyhaemoglobin

(c) Bicarbonate

(d) CO₂ as such

Ans. (c)

21. Animals undergoes inactive stage during winter, is known as

(a) Aestivation

(b) Hibernation

(c) Adaptation

(d) Acclimatization

Ans. (b)

22. Kupffer cells are present in:

(a) Liver

(b) Small intestine

(c) Pancreas

(d) Thyroid gland

Ans. (a)

23. The embryo at 16 celled stages is known as:

(a) Morula

(b) Gastrula

(c) Blastula

(d) Blastomere

Ans. (a)

24. Contractile vacuole in protozoan Amoeba is meant for:

(a) Respiration

(b) Excretion

(c) Locomotion

(d) Osmoregulation

Ans. (d)

25. In which of the following, putrefying bacteria is present?

(a) Intestine

(b) Colon

(c) Stomach

(d) Liver

Ans. (a)

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