Biology Class 11th Chapter 15 mcqs

1. Mechanism of development was explained by

(a) Hans Dietrisch

(b) Spemann

(c) Both a and b

(d) Haemmerling

Answer: (c) Both a and b

2. Intercalary meristems are of

(a) Permanent nature

(b) Temporary nature

(c) Some are permanent some temporary

(d) None of these

Answer: (b) Temporary nature

3. Cells of fibers and tracheids elongate during

(a) Phase of cell division

(b) Phase of cell elongation

(c) Phase of cell maturation

(d) Phase of cell differentiation

Answer: (a) Phase of cell division

4. Typical plant growth shows _________ curve.

(a) J-shaped

(b) S-shaped

(c) I-shaped

(d) Parabolic

Answer: (b) S-shaped

5. Exponential growth of the plants is express as W1 = W0 ert r represents

(a) ability of the plant to produce new cells

(b) efficiency index

(c) relative growth rate

(d) all of the above

Answer: (d) all of the above

6. Opening of floral buds into flowers, is a type of:

(a) Autonomic movement of variation

(b) Autonomic movement of locomotion

(c) Autonomic movement of growth

(d) Paratonic movement of growth

Answer: (c) Autonomic movement of growth

7. Which one is incorrect?

(a) Epiblast is presumptive ectoderm and mesoderm

(b) Hypoblast is presumptive endoderm

(c) Hypoblast is presumptive mesoderm

(d) Upper layer of cells in blastoderm is epiblast

Answer: (c) Hypoblast is presumptive mesoderm

8. The stage of rapid cell division just after fertilization is

(a) Organogenesis

(b) Cleavage

(c) Gastrulation

(d) Growth

Answer: (b) Cleavage

9. Plants grow throughout their life due to

(a) presence of meristems

(b) presence of vascular cambium

(c) presence of xylem and phloem

(d) presence of tracheids

Answer: (a) presence of meristems

10. Liver and pancreas arise from

(a) Foregut

(b) Midgut

(c) Hindgut

(d) None of these

Answer: (a) Foregut

11. Which one of the followings is a gaseous plant hormone?

(a) Ethylene

(b) Gibberellin

(c) IAA

(d) Abscisic acid

Answer: (a) Ethylene

12. To prevent over – ripening, bananas should be

(a) given a dip in ascorbic acid

(b) maintained at room temperature

(c) refrigerated

(d) stored at the top of refrigerator

Answer: (c) refrigerated

13. Growth in dorsiventral leaf is measured in terms of

(a) length of leaf

(b) increase in cell number

(c) surface area increase

(d) none of these

Answer: (c) surface area increase

14. Mechanism of development was explained by

(a) Hans Dietrisch

(b) Spemann

(c) Both a and b

(d) Haemmerling

Answer: (c) Both a and b

15. The ability to regain or recover the lost or injured part of body is

(a) Aging

(b) Regeneration

(c) Abnormal development

(d) Primary induction

Answer: (b) Regeneration

16. Which growth hormone accerlates the malting process in brewing industry?

(a) Auxins

(b) Gibberellins

(c) Ethylene

(d) Cytokinins

Answer: (b) Gibberellins

17. Which plant growth regulator is the derivative of carotenoids?

(a) Auxin

(b) Gibberelic acid

(c) Cytokinin

(d) Abscisic acid

Answer: (d) Abscisic acid

18. Typical plant growth shows _________ curve.

(a) J-shaped

(b) S-shaped

(c) I-shaped

(d) Parabolic

Answer: (b) S-shaped

19. Mobilisation of stored food in germinating seeds is triggered by

(a) auxins

(b) cytokinins

(c) gibberellins

(d) ethylene

Answer: (c) gibberellins

20. Cavity formed between somatic and splanchnic mesoderm is called

(a) Gastrocoele

(b) Blastocoele

(c) Coelom

(d) Neurocoele

Answer: (c) Coelom