NEET Botany Evolution Class 12 Questions

From evolutionary point of view, retention of the female gametophyte with developing young embryo on the parent sporophyte for some time, is first observed in

Which of the following statements are incorrect for Natural selection? (i) Natural selection is based on certain observations which are factual. (ii) Populations are stable in size except for seasonal fluctuation, means that there had been competition for resources. (iii) Variation is the most fundamental evolutionary factor and all variations are inherited to the progeny. (iv) Variations which are heritable and which make resource utilisation better for few (adapted to habitat better) will enable only those to reproduce and leave more progeny. (v) Herbicides, pesticides etc., resistant organisms/cells are appearing in a time scale of months or years and not centuries. (vi) Appearance of herbicides, pesticides etc., resistant organisms/cells are examples of evolution by anthropogenic action.

Match column I with column II

Match List I with List II with respect to chronology of evolution of life forms

In a species, the weight of newborn ranges from 2 to 5 kg. 97% of the newborn with an average weight between 3 to 3.3 kg survive whereas 99% of the infants born with weights from 2 to 2.5 kg or 4.5 to 5 kg die. Which type of selection process is taking place?

Among the following sets of examples for divergent evolution, select the INCORRECT option.

The similarity of bone structure in the forelimbs of many vertebrates is an example of

According to Hugo de Vries, the mechanism of evolution is

Artificial selection to obtain cows yielding higher milk output represents

Analogous structures are a result of

Which of the following had the smallest brain capacity?

Forelimbs of cat, lizard used in walking; forelimbs of whale used in swimming and forelimbs of bats used in flying are examples of

Random unidirectional change in allele frequencies that occur by chance in all populations and especially in small populations is known as :-

Genetic variation in a population arises due to :-