The permissible use of the technique amniocentesis is for:
| 1. | detecting sex of the unborn foetus |
| 2. | artificial insemination |
| 3. | transfer of the embryo into the uterus of a surrogate mother |
| 4. | detecting any genetic abnormality |
During mitosis ER and nucleolus begin to disappear at:
| 1. | late prophase |
| 2. | early metaphase |
| 3. | late metaphase |
| 4. | early prophase |
The free-living, anaerobic nitrogen-fixer is:
1. Beijerinckia
2. Rhodospirillum
3. Rhizobium
4. Azotobacter
DNA or RNA segment tagged with a radioactive molecule is called:
| 1. | vector | 2. | probe |
| 3. | clone | 4. | plasmid |
Darwin's finches are a good example of:
1. industrial melanism
2. connecting link
3. adaptive radiation
4. convergent evolution
The signals for parturition originate from:
1. placenta only
2. placenta as well as developed foetus
3. oxytocin released from maternal pituitary
4. fully developed foetus only
What is true about RBCs in humans?
| 1. | They carry about 20-25 per cent of CO2 |
| 2. | They transport 99.5 per cent of O2 |
| 3. | They transport about 80 per cent oxygen only and the rest 20 per cent of it is transported in dissolved state in blood plasma |
| 4. | They do not carry CO2 at all |
Which stages of cell division do the following figures A and B represent respectively?
| 1. | Metaphase- Telophase | 2. | Telophase- Metaphase |
| 3. | Late anaphase- Prophase | 4. | Prophase- Anaphase |
The main arena of various types of activities of a cell is:
| 1. | Plasma membrane | 2. | Mitochondria |
| 3. | Cytoplasm | 4. | Nucleus |
The common nitrogen-fixer in paddy fields is:
1. Rhizobium
2. Azospirillum
3. Oscillatoria
4. Frankia
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