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Q. No.A typical angiosperm anther is:
1. Bilobed and polythecous
2. Unilobed and monothecous
3. Multilobed and monothecous
4. Bilobed and dithecous
Subtopic: Stamen: Anther | Stamen: Microsporangium |
95%
From NCERT
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Tapetum:
| 1. | is the outermost layer in the wall of microsporangium |
| 2. | helps in the protection of the pollen grains |
| 3. | helps in dehiscence of anther |
| 4. | has cells that generally have more than one nucleus |
Subtopic: Stamen: Anther |
82%
From NCERT
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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%
From NCERT
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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 |
87%
From NCERT
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‘Germ pore’ in pollen in angiosperms:
| 1. | is a part of pollen intine where sporopollenin is present |
| 2. | is a part of pollen intine where sporopollenin is absent |
| 3. | is a part of pollen exine where sporopollenin is present |
| 4. | is a part of pollen exine where sporopollenin is absent |
Subtopic: Stamen: Male Gametophyte |
77%
From NCERT
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Identify the incorrect statement regarding Parthenium hysterophorus:
| 1. | Its pollens are a very common cause of severe respiratory allergies. |
| 2. | It was introduced in India accidentally as a contaminant in wheat. |
| 3. | It is a native of tropical America |
| 4. | It is non-invasive and limited to certain pockets in India only |
Subtopic: Stamen: Male Gametophyte |
78%
From NCERT
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At what temperature pollens can be stored for years in liquid nitrogen?
| 1. | 0°C | 2. | -100°C |
| 3. | -196°C | 4. | 4°C |
Subtopic: Stamen: Microsporangium | Stamen: Male Gametophyte |
98%
From NCERT
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Pollen grains lose viability within 30 minutes of their release in some members of:
| 1. | Rosaceae | 2. | Leguminosae |
| 3. | Poaceae | 4. | Solanaceae |
Subtopic: Stamen: Male Gametophyte |
75%
From NCERT
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The correct description of the structure shown in the figure would be:
| 1. | Anatropous ovule; 1 – Nucellus; 2 – Chalaza; 3 – Raphe; 4 – Funiculus |
| 2. | Orthotropous ovule; 1 – Nucellus; 2 – Micropyle; 3 – Raphe; 4 – Funiculus |
| 3. | Anatropous ovule; 1 – Nucellus; 2 – Chalaza; 3 – Funiculus; 4 – Raphe |
| 4. | Anatropous ovule; 1 – Nucellus; 2 – Micropyle; 3 – Raphe; 4 – Funiculus |
Subtopic: Pistil: Ovule |
66%
From NCERT
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When the embryosac develops from a single functional megaspore [the other three get generate], it is called as:
| 1. | Monosporic | 2. | Bisporic |
| 3. | Trisporic | 4. | Tetrasporic |
Subtopic: Pistil: Ovule |
92%
From NCERT
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