Q61
The response of different organisms to environmental rhythms of light and darkness is called
Correct Answer
Option B
Solution
(b) Photoperiodism = response to the duration of light and dark periods.
Plant Growth and Development
Q62
If a tree flowers thrice in a year in Northern India, it is said to be
Correct Answer
Option D
Solution
(d) Flowering at all seasons means the tree is insensitive to both photoperiod and temperature.
Q63
Movement of leaves of Sensitive Plant, Mimosa pudica are due to
Correct Answer
Option B
Solution
(b) Seismonastic movement in Mimosa pudica is caused by sudden touch stimulus.
Q64
Anthesis is a phenomenon which refers to
Correct Answer
Option D
Solution
(d) Anthesis = the period when a flower is fully open and functional.
Q65
Opening of floral buds into flowers is a type of
Correct Answer
Option C
Solution
(c) Opening of floral buds is an autonomic growth movement (epinasty).
Q66
Senescence as an active developmental cellular process in a flowering plant is indicated in
Correct Answer
Option B
Solution
(b) Leaf abscission is the most prominent example of senescence as an active developmental process.
Q67
Coiling of garden pea tendrils around any support is an example of
Correct Answer
Option C
Solution
(c) Thigmotropism: directional growth in response to touch, e.g., pea tendrils.
Q68
Leaves of many grasses are capable of folding and unfolding because they have specialised
Correct Answer
Option C
Solution
(c) Bulliform (motor) cells in monocot leaves control rolling/unrolling by turgor changes.
Q69
Phytohormones are
Correct Answer
Option D
Solution
(d) Phytohormones are plant-synthesized regulators of physiological processes.
Q70
Typical growth curve in plants is
Correct Answer
Option D
Solution
(d) Plants show a sigmoid (S-shaped) growth curve.
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