Which one of the following statements is correct?
1. | The seed in grasses is not endospermic |
2. | Mango is a parthenocarpic fruit |
3. | A proteinaceous aleurone layer is present in maize grain. |
4. | A sterile pistil is called a staminode. |
Tracheids differ from the tracheary elements in:
1. Having casparian strips
2. Being imperforate
3. Lacking nucleus
4. Being lignified
Example of an edible underground stem is:
1. Carrot
2. Groundnut
3. Sweet potato
4. Potato
Which of the following structures performs the function of mitochondria in a bacteria?
1. | Nucleoid | 2. | Ribosomes |
3. | Cell wall | 4. | Mesosomes |
The solid linear cytoskeletal elements having a diameter of 6 nm and made up of a single type of monomer are known as:
1. Microtubules
2. Microfilaments
3. Intermediate filaments
4. Lamins
The osmotic expansion of a cell kept in water is chiefly regulated by:
1. Mitochondria
2. Vacuoles
3. Plastids
4. Ribosomes
During which phase(s) of the cell cycle, amount of DNA in a cell remains at 4 C level if the initial amount is denoted as 2C:
1. G0 and G1
2. G1 and S
3. Only G2
4. G2 and M
Match the following and select the correct answer:
Column I | Column II | ||
(a) | Centriole | (i) | Infoldings in mitochondria |
(b) | Chlorophyll | (ii) | Thylakoids |
(c) | Cristae | (iii) | Nucleic acids |
(d) | Ribozymes | (iv) | Basal body of cilia or flagella |
1. A-iv, B-ii, C-i, D-iii
2. A-i, B-ii, C-iv, D-iii
3. A-i, B-iii, C-ii, D-iv
4. A-iv, B-iii, C-i, D-ii
Dr. F. Went noted that if coleoptile tips were removed and placed on agar for one hour, the agar would produce a bending when placed on one side of freshly - cut coleoptile stumps. What is the significance of this experiment?
1. | It made possible the isolation and exact identification of auxin. |
2. | It is the basis for the quantitative determination of small amounts of growth-promoting substances. |
3. | It supports the hypothesis that IAA is auxin. |
4. | It demonstrates the polar movements of auxins. |
Deficiency symptoms of nitrogen and potassium are visible first in:
1. Senescent leaves
2. Young leaves
3. Roots
4. Buds