- 1(current)
Q. No.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. |
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The germ pore in the pollen wall:
| 1. | is an aperture in the pollen intine that allows the pollen tube to exit. |
| 2. | is the name of the nucleus of the microspore mother cell. |
| 3. | is formed where sporopollenin is located in the exine. |
| 4. | is an aperture in the pollen exine that allows the pollen tube to exit. |
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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 |
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An organic substance that can withstand environmental extremes and cannot be degraded by any enzyme is:
| 1. | Cuticle | 2. | Sporopollenin |
| 3. | Lignin | 4. | Cellulose |
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Tapetum :
| I. | Is a layer of nutritive cells that are found within the microsporangium. |
| II. | The cells are usually bigger and normally have more than one nucleus per cell because mitosis is not normal in them. |
| III. | Helps in pollen wall formation, transportation of nutrients to the inner side of the anther, synthesis of callose enzyme for separation of microspore tetrads. |
Of the above statements, the correct ones are:
| 1. | I and II only | 2. | I and III only |
| 3. | II and III only | 4. | I, II, and III |
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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 |
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| I. | Exine is made up of sporopollenin |
| II. | Generative cell is bigger than the vegetative cell |
| III. | Generative cell divides meiotically to produce male gametes |
2. Only I and III are correct
3. Only II is correct
4. I, II and III are correct
Match each item in Column I with one in Column II and select your answer from the codes given:
|
Column I |
Column II |
||
|
A |
Stage at which more percent of angiosperms shed their pollen |
P |
3-celled |
|
B |
Pollen grains lose viability within 30 minutes of their release in |
Q |
2-celled |
|
C |
Persistent endosperm |
R |
Some cereals |
|
S |
Some members of Rosaceae |
||
|
T |
Coconut |
||
|
U |
Groundnut |
Codes:
|
A |
B |
C |
|
|
1. |
P |
S |
U |
|
2. |
P |
R |
T |
|
3. |
Q |
R |
T |
|
4. |
Q |
S |
U |
- 1(current)
Q. No.
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