Q.1. Mechanism of development was explained by

1. Hans Dietrisch
2. Spemann
3. Both a and b
4. Haemmerling

Answer: (c) Both a and b
Explanation: Both a and b

Q.2. Intercalary meristems are of

1. Permanent nature
2. Temporary nature
3. Some are permanent some temporary
4. None of these

Answer: (b) Temporary nature
Explanation: Intercalary meristems are of temporary nature

Q.3. Cells of fibers and tracheids elongate during

1. Phase of cell division
2. Phase of cell elongation
3. Phase of cell maturation
4. Phase of cell differentiation

Answer: (a) Phase of cell division
Explanation: Phase of cell division

Q.4. Typical plant growth shows _________ curve.

1. J-shaped
2. S-shaped
3. I-shaped
4. Parabolic

Answer: (b) S-shaped
Explanation: Typical plant growth represents sigmoid curve

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

1. ability of the plant to produce new cells
2. efficiency index
3. relative growth rate
4. all of the above

Answer: (d) all of the above
Explanation: r is the relative growth rate and also measures the ability of the plant to produce new plant material (efficiency index).

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

1. Autonomic movement of variation
2. Autonomic movement of locomotion
3. Autonomic movement of growth
4. Paratonic movement of growth

Answer: (c) Autonomic movement of growth

Q.7. Which one is incorrect?

1. Epiblast is presumptive ectoderm and mesoderm
2. Hypoblast is presumptive endoderm
3. Hypoblast is presumptive mesoderm
4. Upper layer of cells in blastoderm is epiblast

Answer: (c) Hypoblast is presumptive mesoderm
Explanation: Upper layer of cells in blastoderm is epiblast

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

1. Organogenesis
2. Cleavage
3. Gastrulation
4. Growth

Answer: (b) Cleavage

Q.9. Which one of the followings is a gaseous plant hormone?

1. Ethylene
2. Gibberellin
3. IAA
4. Abscisic acid

Answer: (a) Ethylene
Explanation: Ethylene

Q.10. To prevent over – ripening, bananas should be

1. given a dip in ascorbic acid
2. maintained at room temperature
3. refrigerated
4. stored at the top of refrigerator

Answer: (c) refrigerated
Explanation: refrigerated

Q.11. Growth in dorsiventral leaf is measured in terms of

1. length of leaf
2. increase in cell number
3. surface area increase
4. none of these

Answer: (c) surface area increase
Explanation: Increase in surface area denotes the growth in a dorsiventral leaf

Q.12. Plants grow throughout their life due to

1. presence of meristems
2. presence of vascular cambium
3. presence of xylem and phloem
4. presence of tracheids

Answer: (a) presence of meristems
Explanation: Plants growth throughout their life due to the presence of meristems at certain locations in their body.

Q.13. Mechanism of development was explained by

1. Hans Dietrisch
2. Spemann
3. Both a and b
4. Haemmerling

Answer: (c) Both a and b
Explanation: Haemmerling

Q.14. The ability to regain or recover the lost or injured part of body is

1. Aging
2. Regeneration
3. Abnormal development
4. Primary inductio

Answer: (b) Regeneration
Explanation: Regeneration

Q.15. Which growth hormone accerlates the malting process in brewing industry?

1. Auxins
2. Gibberellins
3. Ethylene
4. Cytokinins

Answer: (b) Gibberellins
Explanation: Gibberellins especially GA3 is used to speed up the malting process in brewing industry

Q.16. Which plant growth regulator is the derivative of carotenoids?

1. Auxin
2. Gibberelic acid
3. Cytokinin
4. Abscisic acid

Answer: (d) Abscisic acid
Explanation: Abscisic acid are the derivatives of carotenoids.

Q.17. Typical plant growth shows _________ curve.

1. J-shaped
2. S-shaped
3. I-shaped
4. Parabolic

Answer: (b) S-shaped
Explanation: Typical plant growth represents sigmoid curve.

Q.18. Mobilisation of stored food in germinating seeds is triggered by

1. auxins
2. cytokinins
3. gibberellins
4. ethylene

Answer: (c) gibberellins

Q.19. Cavity formed between somatic and splanchnic mesoderm is called

1. Gastrocoele
2. Blastocoele
3. Coelom
4. Neurocoele

Answer: (c) Coelom

Q.20. IAA is naturally occurring plant hormone called

1. Gibberlin
2. Auxin
3. Cytokinin
4. Absicic acid

Answer: (b) Auxin
Explanation: Auxin

Q.21. Auxin is synthesised from in apical meristem from amino acid

1. Isoleucine
2. Methionine
3. Niacin
4. Tryptophan

Answer: (d) Tryptophan

Q.22. Growth regulator which induces parthenocarpy

1. IAA
2. ABA
3. Cytokinin
4. Ethylene

Answer: (a) IAA

Q.23. Formation of seedless fruit without act of fertilisation

1. Parthenocarpy
2. pseudocarpy
3. Apomixis
4. Parthenogenesis

Answer: (a) Parthenocarpy
Explanation: Parthenocarpy

Q.24. The major site for production of gibberellin is

1. Embryos
2. Roots
3. Young leaves
4. All of these

Answer: (d) All of these

Q.25. Gibberellin is isolated from

1. Brian et al
2. Went
3. Yabuta
4. Kurosawa

Answer: (a) Brian et al
Explanation: Brian et al