What would be the number of chromosomes in the cells of the aleurone layer in a plant species with 8 chromosomes in its synergids?
1. 16
2. 24
3. 32
4. 8
Pineapple (annanas) fruit develops from:
| 1. | a unilocular polycarpillary flower |
| 2. | a multipistillate syncarpous flower |
| 3. | a cluster of compactly borne flowers on a common axis |
| 4. | a multilocular monocarpillary flower |
Golden rice is a promising transgenic crop. When released for cultivation, it will help in:
1. alleviation of vitamin-A deficiency
2. pest resistance
3. herbicide tolerance
4. producing a petrol-like fuel from rice
Parthenocarpic tomato fruits can be produced by:
| 1. | removing androecium of flowers before pollen grains are released |
| 2. | treating the plants with low concentrations of gibberellic acid and auxins |
| 3. | raising the plants from vernalised seeds |
| 4. | treating the plants with phenylmercuric acetate |
How does pruning help in making the hedge dense?
| 1. | It includes the differentiation of new shoots from the rootstock |
| 2. | It frees axillary buds from apical dominance |
| 3. | The apical shoot grows faster after pruning |
| 4. | It releases wound hormones |
The 'blue baby' syndrome results from:
1. excess of chloride
2. methaemoglobin
3. excess of dissolved oxygen
4. excess of TDS (Total Dissolved Solids)
Praying mantis is a good example of:
1. Mullerian mimicry
2. Warning colouration
3. Social insects
4. Camouflage
Which one of the following statements is correct?
| 1. | Neurons regulate endocrine activity, but not vice versa |
| 2. | Endocrine glands regulate neural activity and the nervous system regulates endocrine glands |
| 3. | Neither hormones control neural activity nor the neurons control endocrine activity |
| 4. | Endocrine glands regulate neural activity, but not vice versa |
Examination of the blood of a person suspected of having anaemia, shows large, immature, nucleated erythrocytes without haemoglobin. Supplementing his diet with which of the following, is likely to alleviate his symptoms?
1. Thiamine
2. Folic acid and cobalamine
3. Riboflavin
4. Iron compounds
Farmers in a particular region were concerned that pre-mature yellowing of leaves of a pulse crop might cause a decrease in the yield. Which treatment could be most beneficial to obtain maximum seed yield?
| 1. | Frequent irrigation of the crop |
| 2. | Treatment of the paints with cytokinins along with a small dose of nitrogenous fertilizer |
| 3. | Removal of all yellow leaves and spraying the remaining green leaves with 2,4,5-trichlorophenoxy acetic acid |
| 4. | Application of iron and magnesium to promote the synthesis of chlorophyll |
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