12th Grade > Biology
GROWTH & REPRODUCTION IN PLANTS AND ANIMALS MCQs
Plant Growth And Development, Reproduction In Animals, Sexual Reproduction In Flowering Plants
Total Questions : 111
| Page 9 of 12 pages
Answer: Option C. -> Thigmotropism
:
C
Thigmotropism is the movement due to contact with a foreign body. In twinners and lianas, there is less growth on the side of contact and more growth on the branch away from the contact. Coiling of garden pea tendrils around any support is an example of thigmotropism.
:
C
Thigmotropism is the movement due to contact with a foreign body. In twinners and lianas, there is less growth on the side of contact and more growth on the branch away from the contact. Coiling of garden pea tendrils around any support is an example of thigmotropism.
:
The increase in growth per unit time is called growth rate. In arithmetic growth after mitotic cell division, one daughter cell continue to divide and the other cell differentiates and matures.
Answer: Option D. -> Cytokinin
:
D
Coconut milk factor is a cytokinin.Kinetin does not occur naturally in plants. Search for natural substances with cytokinin-like activities led to the isolation of zeatin from corn-kernels and coconut milk.
:
D
Coconut milk factor is a cytokinin.Kinetin does not occur naturally in plants. Search for natural substances with cytokinin-like activities led to the isolation of zeatin from corn-kernels and coconut milk.
Answer: Option C. -> Apical meristem
:
C
Primary growth in plants is due to apical meristems (root and shoot apical meristems)
:
C
Primary growth in plants is due to apical meristems (root and shoot apical meristems)
Answer: Option C. -> 99
:
C
In arithmetic growth, following mitotic cell division, only one daughter cell continues to divide while the other differentiates and matures.
N =100, N = n+1
100 = n+1
n =99
:
C
In arithmetic growth, following mitotic cell division, only one daughter cell continues to divide while the other differentiates and matures.
N =100, N = n+1
100 = n+1
n =99
Answer: Option B. -> Gibberellins
:
B
Genetic dwarfism is solved by the usage of gibberellins. Ethylene is a gaseous hormone, which induces ripening in unripe fruits. ABA cause ageing and abscission of leaves.
:
B
Genetic dwarfism is solved by the usage of gibberellins. Ethylene is a gaseous hormone, which induces ripening in unripe fruits. ABA cause ageing and abscission of leaves.
Answer: Option D. -> Secondary and lateral meristem
:
D
Cork cambium (phellogen) is a secondary and lateral meristem.
:
D
Cork cambium (phellogen) is a secondary and lateral meristem.
Answer: Option D. -> Secondary and lateral meristem
:
D
Cork cambium (phellogen) is a secondary and lateral meristem.
:
D
Cork cambium (phellogen) is a secondary and lateral meristem.
Answer: Option D. -> 1, 3 and 4 are correct
:
D
Genetically dwarf maize and pea plants can be made tall by gibberellins. They also promote bolting and flowering . In cucurbita and cannabis more male flowers than female flowers are formed by their action. Gibberellins are known for inducing seed germination as they mobilize reserve food material hence are widely used for malting process in brewing industry.
:
D
Genetically dwarf maize and pea plants can be made tall by gibberellins. They also promote bolting and flowering . In cucurbita and cannabis more male flowers than female flowers are formed by their action. Gibberellins are known for inducing seed germination as they mobilize reserve food material hence are widely used for malting process in brewing industry.
Answer: Option A. -> Auxins
:
A
Avena curvature test is a bioassay for examining the activity of auxin. In 1928, Went developed a method of quantifying auxin. His results suggested that the curvatures of stems were proportional to the amount of auxin in the agar (Went, 1928). This test was called the avena curvature test. Much of our current knowledge of auxin was obtained from its applications.
:
A
Avena curvature test is a bioassay for examining the activity of auxin. In 1928, Went developed a method of quantifying auxin. His results suggested that the curvatures of stems were proportional to the amount of auxin in the agar (Went, 1928). This test was called the avena curvature test. Much of our current knowledge of auxin was obtained from its applications.
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