Which one of the following options gives one correct example each of convergent evolution and divergent evolution?
Options
(a) Eyes of octopus and mammals – Bones of forelimbs of vertebrates (b) Thorns of […]
The extinct human who lived 1,00,000 to 40,000 years ago in Europe, Asia and parts of Africa, With short stature, heavy eyebrows, retreating fore heads, large jaws with heavy teeth, stocky bodies, a lumbering gait […]
Evolution of different species in a given area starting from a point and spreading to other geographical areas is known as : [2012]
Options
(a) Adaptive radiation (b) Natural selection (c) Migration (d) […]
Which one of the following is a wrong statement?
Options
(a) Most of the forests have been lost in tropical areas (b) Ozone in upper part of atmosphere is harmful to animals (c) […]
Measuring Biochemical Oxygen Demand (BOD) is a method used for :
Options
(a) estimating the amount of organic matter in sewage water (b) working out the efficiency of oil driven automobile engines (c) […]
In an area where DDT had been used extensively, the population of birds declined significantly because:
Options
(a) birds stopped laying eggs (b) earthworms in the area got eradicated (c) cobras were feeding […]
Pheretima and its close relatives derive nourishment from :
Options
(a) sugarcane roots (b) decaying fallen leaves and soil organic matter (c) soil insects (d) small pieces of fresh fallen leaves of maize, […]
What is correct to say about the hormone action in humans
Options
(a) Glucagon is secreted by β-cells of islets of Langerhans and stimulates glycogenolysis (b) Secretion of thymosins is stimulated with ageing (c) […]
Which one of the following pairs of hormones are the examples of those that can easily pass through the cell membrane of the target cell and bind to a receptor inside it (Mostly in the […]
F₂ generation in a Mendelian cross showed that both genotypic and phenotypic ratios are same as 1 : 2 : 1. It represents a case of :
Options
(a) Co – dominance (b) […]
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