Question 1.
Mechanism of development was explained by
(a) Hans Dietrisch
(b) Spemann
(c) Both a and b
(d) Haemmerling
Answer
Answer: (c) Both a and b
Question 2.
Intercalary meristems are of
(a) Permanent nature
(b) Temporary nature
(c) Some are permanent some temporary
(d) None of these
Answer
Answer: (b) Temporary nature
Question 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
Answer: (a) Phase of cell division
Question 4.
Typical plant growth shows _________ curve.
(a) J-shaped
(b) S-shaped
(c) I-shaped
(d) Parabolic
Answer
Answer: (b) S-shaped
Explanation:
Typical plant growth represents sigmoid curve.
Question 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
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).
Question 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
Answer: (c) Autonomic movement of growth
Question 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
Answer: (c) Hypoblast is presumptive mesoderm
Question 8.
The stage of rapid cell division just after fertilization is
(a) Organogenesis
(b) Cleavage
(c) Gastrulation
(d) Growth
Answer
Answer: (b) Cleavage
Question 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
Answer: (a) presence of meristems
Explanation:
Plants growth throughout their life due to the presence of meristems at certain locations in their body.
Question 10.
Liver and pancreas arise from
(a) Foregut
(b) Midgut
(c) Hindgut
(d) None of these
Answer
Answer: (a) Foregut
Question 11.
Which one of the followings is a gaseous plant hormone?
(a) Ethylene
(b) Gibberellin
(c) IAA
(d) Abscisic acid
Answer
Answer: (a) Ethylene
Question 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
Answer: (c) refrigerated
Question 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
Answer: (c) surface area increase
Explanation:
Increase in surface area denotes the growth in a dorsiventral leaf.
Question 14.
Mechanism of development was explained by
(a) Hans Dietrisch
(b) Spemann
(c) Both a and b
(d) Haemmerling
Answer
Answer: (c) Both a and b
Question 15.
The ability to regain or recover the lost or injured part of body is
(a) Aging
(b) Regeneration
(c) Abnormal development
(d) Primary inductio
Answer
Answer: (b) Regeneration
Question 16.
Which growth hormone accerlates the malting process in brewing industry?
(a) Auxins
(b) Gibberellins
(c) Ethylene
(d) Cytokinins
Answer
Answer: (b) Gibberellins
Explanation:
Gibberellins especially GA3 is used to speed up the malting process in brewing industry.
Question 17.
Which plant growth regulator is the derivative of carotenoids?
(a) Auxin
(b) Gibberelic acid
(c) Cytokinin
(d) Abscisic acid
Answer
Answer: (d) Abscisic acid
Explanation:
Abscisic acid are the derivatives of carotenoids.
Question 18.
Typical plant growth shows _________ curve.
(a) J-shaped
(b) S-shaped
(c) I-shaped
(d) Parabolic
Answer
Answer: (b) S-shaped
Explanation:
Typical plant growth represents sigmoid curve.
Question 19.
Mobilisation of stored food in germinating seeds is triggered by
(a) auxins
(b) cytokinins
(c) gibberellins
(d) ethylene
Answer
Answer: (c) gibberellins
Question 20.
Cavity formed between somatic and splanchnic mesoderm is called
(a) Gastrocoele
(b) Blastocoele
(c) Coelom
(d) Neurocoele
Answer
Answer: (c) Coelom
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