In the case of peppered moth (Biston betularia), the black-coloured form became dominant over the light-coloured form in England during the industrial revolution. This is an example of:
1.
natural selection, whereby the darker forms were selected
2.
appearance of the darker coloured individuals due to very poor sunlight
3.
protective mimicry
4.
inheritance of darker colour character acquired due to the darker environment
Oxygenic photosynthesis occurs in:
1. Chromatium
2. Oscillatoria
3. Rhodospirillum
4. Chlorobium
The genetic defect-Adenosine Deaminase (ADA) deficiency may be cured permanently by:
| 1. | periodic infusion of genetically engineered lymphocytes having functional ADA cDNA |
| 2. | administering adenosine deaminase activators |
| 3. | introducing bone marrow cells producing ADA into cells at early embryonic stages |
| 4. | invitro cell culture therapy |
The annular and spirally thickened conducting elements generally develop in the protoxylem when the root or stem is:
1. maturing
2. elongating
3. widening
4. differentiating
In barley stem, vascular bundles are:
1. open and scattered
2. closed and scattered
3. open and in a ring
4. closed and radial
Sickle cell anaemia is:
| 1. | an autosomal linked dominant trait |
| 2. | caused by substitution of valine by glutamic acid in the globin chain of haemoglobin |
| 3. | caused by a change in base pair of DNA |
| 4. | characterized by elongated sickle like RBCs with a nucleus |
If a live earthworm is pricked with a needle on its outer surface without damaging its gut, the fluid that comes out is:
1. excretory fluid
2. coelomic fluid
3. haemolymph
4. slimy mucus
Which one of the following has maximum genetic diversity in India?
1. Teak
2. Mango
3. Wheat
4. Tea
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