Q. No.The correct sequence of layers in the wall of an anther from outside to inside is:
1.
Tapetum – Middle Layers – Endothecium – Epidermis
2.
Epidermis – Endothecium – Tapetum – Middle layers
3.
Epidermis – Endothecium – Middle layers – Tapetum
4.
Tapetum – Endothecium – Middle layers – Epidermis
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 |
Match the structure in Column-I with the description in Column-II and choose your answer from the codes given below:
| Column-I | Column-II | ||
| A. | Stigma | a. | Landing platform for pollen grains |
| B. | Ovary | b. | Basal bulged part of the pistil |
| C. | Placenta | c. | Part of the ovary where funiculus attaches |
| D. | Ovule | d. | Megasporangium |
Codes
| A | B | C | D | |
| 1. | a | b | c | d |
| 2. | a | c | b | d |
| 3. | b | a | d | c |
| 4. | d | c | b | a |
Identify the incorrectly matched pair:
| Cell | Ploidy | |
| 1. | Cells of nucellus | Diploid |
| 2. | Megaspore mother cell | Haploid |
| 3. | Functional megaspore | Haploid |
| 4. | Cells of female gametophyte | haploid |
In angiosperms:
1. Pollen grains are motile but the egg cell is non-motile.
2. Pollen grains are non-motile but the egg cell is motile.
3. Both pollen grain and egg cell are non-motile.
4. Both pollen grain and egg cell are motile.
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 |
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 |
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 |
Syngamy in angiosperms results in the formation of:
| 1. | A haploid cell | 2. | A diploid cell |
| 3. | A triploid cell | 4. | A polyploid cell |
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