Which of the following is incorrect regarding pollen grains in angiosperms?
1. | The exine is made up of sporopollenin. |
2. | Generative cell divides meiotically to give rise to four gametes. |
3. | In over 60% of angiosperms, pollen grains are shed at the 2-celled stage. |
4. | Pollen grains of many species can cause severe allergies in humans. |
Identify the incorrectly matched pair:
1. |
Cleistogamous flowers |
Invariable autogamous |
2. |
Geitonogamy |
Functionally cross-pollination |
3. |
Wind pollination |
Common in grasses |
4. |
Pollination by water |
Seen in all aquatic plants |
To encourage cross-pollination, all the following devices will be useful in an angiosperm except:
1. | Self-incompatibility |
2. | Asynchrony between pollen release and stigma receptivity |
3. | Cleistogamous flowers |
4. | Dioecy |
Which of the following is incorrect regarding seeds in angiosperms?
1. | Mature seeds of peas and ground nuts are ex-albuminous. |
2. | Perisperm is seen in the mature seeds of black pepper and beet. |
3. | Dormant seeds have relatively higher moisture content than germinating seeds. |
4. | As ovules mature into seeds, the ovary develops into a fruit. |
Identify the incorrect statement regarding angiosperm:
1. | A typical anther is bilobed and dithecous |
2. | Cells of tapetum are nourishing to developing pollen grains |
3. | In over 60% of angiosperms pollen grains are shed at the 3-celled stage |
4. | It is possible to store many pollen grains by cryopreservation |
What functions as the embryonic root of the plant?
1. | A | 2. | B |
3. | C | 4. | D |
Consider the following statements:
I: | A monoecious plant bears either male or female flowers. |
II: | In monoecious plants, autogamy may be prevented but not geitonogamy. |
III: | Cucurbits and coconuts are monoecious plants. |
1. | I and II only | 2. | I and III only |
3. | II and III only | 4. | I, II, and III |
Which layer of the anther wall helps in its dehiscence?
1. | A | 2. | B |
3. | C | 4. | D |
The following diagram shows:
1. | Multicarpellary, syncarpus pistil of Papaver |
2. | Multicarpellary, apocarpus pistil of Papaver |
3. | Multicarpellary, apocarpous gynoecium of Michelia |
4. | Multicarpellary, syncarpous gynoecium of Michelia |
Match each item in Column I with one in Column II and select the correct answer from the codes given:
A. |
Pollen exine |
P. |
Cellulose and pectin |
B. |
Pollen intine |
Q. |
Sporopollenin |
C. |
Antipodals |
R. |
Nutrition to the embryo sac |
D. |
Synergids |
S. |
Pollen tube guidance |
A. |
B. |
C. |
D. |
|
1. |
P |
Q |
R |
S |
2. |
Q |
P |
S |
R |
3. |
Q |
P |
R |
S |
4. |
P |
Q |
S |
R |