A male human is heterozygous for autosomal genes A and B and is also hemizygous for hemophilic gene h. What proportion of his sperm will be ABH?

India's wheat yield revolution in the 1960s was possible primarily due to:

1. Increased chlorophyll content

2. Mutations resulting in plant height reduction

3. Quantitative trait mutations

4. Hybrid seeds

The most likely reason for the development of resistance against pesticides in insects damaging a crop is:

1. Genetic recombination

2. Directed mutations

3. Acquired heritable changes

4. Random mutations 

The following ratio is generally constant for a given species:

A self-fertilizing trihybrid plant forms:

Lichens are a well-known combination of an alga and a fungus where the fungus has:
1. An epiphytic relationship with the alga
2. A parasitic relationship with the alga
3. A symbiotic relationship with the alga
4. A saprophytic relationship with the alga

Which of the following is expected to have the highest value (gm/$m^2$ /yr) in a grassland ecosystem: 

1. Tertiary production
2. Gross production (GP)
3. Net production (NP)
4. Secondary production 

Lack of independent assortment of two genes A and B in the fruit fly Drosophila is due to:

1. Recombination

2. Linkage

3. Crossing over

4. Repulsion 

In your opinion, which is the most effective way to conserve the plant diversity of an area:

1. By creating a biosphere reserve

2. By creating a botanical garden

3. By developing a seed bank

4. By tissue culture method

If by radiation all nitrogenase enzymes are inactivated, then there will be no:
1. Fixation of atmospheric nitrogen
2. Conversion from nitrate to nitrite in legumes
3. Conversion from ammonium to nitrate in soil
4. Fixation of nitrogen in legumes