The number of chromosomes in the shoot-tip cells of a maize plant is 20. The number of chromosomes in the microspore mother cells of the same plant shall be:
1. 20
2. 10
3. 40
4. 15
The process of sexual reproduction which involves meiosis and syngamy is:
1. | Apomixis | 2. | Amphimixis |
3. | Agamospermy | 4. | Diplospory |
Grafting is not successful in monocots but is successful in dicots because they have:
1. Vascular bundles arranged in a ring
2. Cambium for secondary growth
3. Vessels with elements arranged end to end
4. Cork cambium
A scion is grafted on a stock. The quality of fruits produced will depend upon the genotype of:
1. Scion
2. Stock
3. Both 1. and 2.
4. None of the above
A prominent Indian botanist noted chiefly for his invention of the technique of test-tube fertilization of angiosperms is:
1. | Panchanan Maheshwari | 2. | M. S. Swaminathan |
3. | Gurdev Khush | 4. | Y. Subbarow |
Consider the two statements:
I: | Lifespan of living organisms are correlated with their body size |
II: | Almost always, larger the body size more will be the lifespan |
1. Both I and II are correct and II explains I.
2. Both I and II are correct but II does not explain I.
3. I is correct and II is incorrect.
4. Both I and II are incorrect.
Which of the following is not always true for sexual mode of reproduction?
I. Separate sexes in the species
II. Gamete formation
III. Fertilization
1. | Only I | 2. | Only III |
3. | Both I and III | 4. | Both II and III |
A plant with both male flowers and female flowers is called as:
1. | Unisexual | 2. | Bisexual |
3. | Dioecious | 4. | Monoecious |
A flower that produces only pollens is called as:
1. | Perfect flower | 2. | Staminode |
3. | Dioecious | 4. | Staminate |
Identify the incorrectly matched pair:
1. Cockroach - Unisexual animal
2. Chara - Monoecious plant
3. Marchantia - Dioecious plant
4. Sweet potato - Unisexual flower