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
In which one of the following processes CO2 is not released?
1. Aerobic respiration in plants
2. Aerobic respiration in animals
3. Alcoholic fermentation
4. Lactate fermentation
Anoxygenic photosynthesis is characteristic of:
1. Rhodospirillum
2. Spirogyra
3. Chlamydomonas
4. Ulva