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Q. No.Majority of plants:
1.
Use abiotic agents for pollination
2.
Use biotic agents for pollination
3.
Do not use any agent for pollination
4.
Use both abiotic and biotic agents for pollination.
Subtopic: Pollination & Outbreeding Devices |
74%
Level 2: 60%+
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Pollens grains are long ribbon-like and are carried passively in water in:
| 1. | female plants remain submerged in water |
| 2. | male plants remain submerged in water |
| 3. | both male and female plants remain submerged in water |
| 4. | both male and female plants reach the surface of the water. |
Subtopic: Pollination & Outbreeding Devices |
Level 3: 35%-60%
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Double fertilization is:
| 1. | Seen in some flowering plants |
| 2. | In seen in many flowering plants |
| 3. | Is seen in both flowering and non-flowering plants |
| 4. | Is a unique event of flowering plants |
Subtopic: Double Fertilization |
84%
Level 1: 80%+
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Transfer of pollens from the anther to the stigma of the same flower is called:
| 1. | Autogamy | 2. | Geitonogamy |
| 3. | Xenogamy | 4. | Cleistogamy |
Subtopic: Pollination & Outbreeding Devices |
91%
Level 1: 80%+
Hints
In over 60 % of angiosperms, pollen grains are shed at:
| 1. | 2-celled stage | 2. | 3-celled stage |
| 3. | 4-celled stage | 4. | 1-celled stage |
Subtopic: Stamen: Male Gametophyte |
88%
Level 1: 80%+
Hints
The outer hard layer of the pollen wall is made up of:
| 1. | Callose, which is easily digested by enzymes |
| 2. | Sporopollenin, which is resistant to all enzymes |
| 3. | Hemicellulose, which is difficult to digest by enzymes |
| 4. | Calcium pectate, which is easily digested by enzymes |
Subtopic: Stamen: Microsporangium |
96%
Level 1: 80%+
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Syngamy in angiosperms results in the formation of:
| 1. | A haploid cell | 2. | A diploid cell |
| 3. | A triploid cell | 4. | A polyploid cell |
Subtopic: Double Fertilization |
84%
Level 1: 80%+
Hints
Whether a pollen grain will be able to germinate on a stigma is primarily decided by:
| 1. | The stage at which the pollen is shed |
| 2. | Recognition by the stigma |
| 3. | Maturity of the egg cell in the embryosac |
| 4. | Environmental conditions |
Subtopic: Pollination & Outbreeding Devices |
82%
Level 1: 80%+
Hints
Identify the incorrect statement regarding water-pollinated flowers:
| 1. | Pollination by water is rare and is seen in monocotyledons mostly |
| 2. | Pollen grains in most are covered by a mucilaginous covering |
| 3. | Produce nectar |
| 4. | Are not very colourful |
Subtopic: Pollination & Outbreeding Devices |
86%
Level 1: 80%+
Hints
The only type of pollination which during pollination brings a genetically different type of pollen grains to the stigma is:
| 1. | Chasmogamy | 2. | Cleistogamy |
| 3. | Geitonogamy | 4. | Xenogamy |
Subtopic: Pollination & Outbreeding Devices |
92%
Level 1: 80%+
Hints
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