Which of the following is/are a marine plant pollinated by water?
1. | Vallisneria | 2. | Hydrilla |
3. | Zostera | 4. | Both 1 and 2 |
In angiosperms, triple fusion results in the formation of:
1. | Zygote | 2. | Endosperm |
3. | Nucellus | 4. | PEC |
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 |
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 |
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 |
Yucca plant is pollinated by:
1. | Gecko lizard | 2. | Honey bees |
3. | Pronuba moth | 4. | Wind |
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 |
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 |
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 |