Which one of the following pairs is wrongly matched?

• methanogens - gobar gas

• yeast - ethanol

• streptomycetes - antibiotic

• streptomycetes - antibiotic

The 'blue baby' syndrome results from

• excess of chloride

• methaemoglobin

• excess of dissolved oxygen

• excess of dissolved oxygen

Adaptive radiation refers to

• adaptations due to geographical isolation

• evolution of different species from a common ancestor

• migration of members of a species to different geographical areas

• migration of members of a species to different geographical areas

In pea plants, yellow seeds are dominant to green. If a heterozygous yellow seeded plant is crossed with a green seeded plant, what ratio of yellow and green seeded plants would you expect in F₁ generation?

• 50:50

• 9:1

• 1:3

• 1:3

Golden rice is a promising transgenic crop. When released for cultivation, it will help in

• alleviation of vitamin A deficiency

• pest resistance

• herbicide tolerance

• herbicide tolerance

If the mean and the median pertaining to a certain character of a population are of the same value, which of the following is most likely to occur

• a normal distribution

• a bi-modal distribution

• a T-shaped curve

• a T-shaped curve

A high density of elephant population in an area can result in

• Mutualism

• Intraspecific competition

• Interspecific competition

• Interspecific competition

When two species of different genealogy come to resemble each other as a result of adaptation, the phenomenon is termed

• divergent evolution

• microevolution

• co-evolution

• co-evolution

How does pruning help in making the hedge dense?

• It induces the differentiation of new shoots from the rootstock

• It frees axillary buds from apical dominance

• The apical shoot grows faster after pruning

• The apical shoot grows faster after pruning

Parthenocarpic tomato fruits can be produced by

• Removing androecium of flowers before pollen grains are released

• Treating the plants with low concentrations of gibberellic acid and auxins

• Raising the plants from vernalized seeds

• Raising the plants from vernalized seeds