The
movement of entire organism or of motile organs and are induced by the external
stimuli, which influence their direction are called…….movements.
a) nasic
b) tactic
c) tropic
d) nutation
Explanation: the stimuli may light (phototactic), temperature (thermotactic) and chemical (chemotactic)
Photoperiodism:
According to photoperiodism, plants can be classified into…….types.
a) two
b) three
c) four
d) five
Explanation: 1. Short day plants, 2. Long day plants, and 3. Day neutral plants
Which of the following plants produce flowers in early spring?
a) short day plants
b) long day plants
c) day neutral plants
d) all of these
Explanation: when the day length is shorter than critical value
Which of the following is/are the example/s of short day plants?
a) tobacco, Dahlia
b) soya bean
c) Chyrsanthemum
d) all of these
Explanation: for short day plants the critical value is maximum for flowering
Which of the following plants produce flowers in summer?
a) short day plants
b) long day plants
c) day neutral plants
d) all of these
Explanation: when the day length is longer than critical value
