Vernalisation is the response due to
Options
(a) high temperature (b) optimum temperature (c) low temperature (d) extreme temperature
Correct Answer:
low temperature
Explanation:
Photoperiodism is the response of plants to the relative […]
Thigmotropic movement is best shown by
Options
(a) movement in roots (b) movement in tendrils (c) insectivorous plants (d) movement in Mimosa pudica
Correct Answer:
movement in tendrils
Explanation:
Thigmotropism is a directional […]
The plant responds to photoperiods due to the presence of
Options
(a) phytochromes (b) stomata (c) enzymes (d) phytohormones
Correct Answer:
phytochromes
Explanation:
Phytochrome is a pigment involved in the perception of photoperiodic […]
The plant hormone controlling fruit ripening is
Options
(a) ethylene (b) kinetin (c) I.A.A. (d) GA
Correct Answer:
ethylene
Explanation:
Ethylene (gaseous hormone) aids in ripening of climacteric fruits and dehiscence of dry […]
The most abundant naturally occurring plant hormone is
Options
(a) indole-3 acetic acid (b) ABA (c) cytokinin (d) IBA
Correct Answer:
indole-3 acetic acid
Explanation:
IAA brings about cell wall extension by activating […]
The low temperature treatment that shortens the period between sowing and the flowering is called
Options
(a) chemotaxy (b) freezing injury (c) vernalization (d) devermalization
Correct Answer:
vernalization
Explanation:
Photoperiodism is the response […]
The leaves of Mimosa pudica droop down, when touched, due to
Options
(a) nyctinasty (b) seismonasty (c) photonasty (d) epinasty
Correct Answer:
seismonasty
Explanation:
Nastic movements occur in response to a stinulus. It […]
The leaf of Mimosa on touching becomes flaccid and droops down. This is due to
Options
(a) water goes into pulvinus (b) water movement (c) based on water concentration (d) based on water […]
The ions extruded by auxin during cell wall extension is
Options
(a) potassium (b) sodium (c) magnesium (d) hydrogen
Correct Answer:
hydrogen
Explanation:
IAA brings about cell wall extension by activating proton pump […]
The hormone which prevents seed dormancy is
Options
(a) cytokinins (b) auxin (c) gibberellins (d) ethylene
Correct Answer:
gibberellins
Explanation:
Gibberelin is the hormone that breaks seed/bud dormancy. The tubers of potato reproduce […]
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