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Biology 11 Chapter - 10
Form and Function in Plants -18
1.
The flowering substance in plants was named by chaila-khyan as?
a) Florigen
b) Auxin
c) Cytokinin
d) Gebberellin
2.
The photoreceptor which is involved in the photoperiodism is called as?
a) Phytochrome
b) Auxin
c) Florigen
d) Cytokinin
3.
The colour of phytochrome is?
a) Blue green
b) Yellow green
c) Red green
d) Dark brown
4.
The pr form of phytochrome strongly absorbs?
a) Red light
b) Far red light
c) Blue light
d) Violet light
5.
The pfr form of phytochrome absorbs?
a) Far red light
b) Red light
c) Violet light
d) Blue light
6.
Which one of the following is not true?
a) Pfr form is most stable
b) Pr form is most stable
c) Pfr triggers flowering
d) Pfr form is p730
7.
Pr is converted to pfr during?
a) Day
b) Night
c) Mid night
d) Late night
8.
The pr form of phytochrome is also known as?
a) P660
b) P630
c) P760
d) P730
9.
The pfr form of phytochrome?
a) Inhibit flowering in short day plants
b) Induce flowering in short day plants
c) Inhibit flowering in long day plants
d) None of these
10.
The promotion of flowering by exposure to low temperature is known as?
a) Vernalization
b) Photoperiodism
c) Phototropism
d) Geotropism
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