Questions

Read the passage carefully and choose the best answer to each question out of the four alternatives.

Genetic variation is the cornerstone of evolution, without which there can be no natural selection, and so a low genetic diversity decreases the ability of a species to survive and reproduce, explains lead author Yoshan Moodley, Professor at the Department of Zoology, University of Venda in South Africa.

Two centuries ago, the black rhinoceros – which roamed much of sub Saharan Africa – had 64 different genetic lineages; but today only 20 of these lineages remain, says the paper. The species is now restricted to five countries, South Africa, Namibia, Kenya, Zimbabwe and Tanzania. Genetically unique populations that once existed in Nigeria, Cameroon, Chad, Eritrea, Ethiopia, Somalia, Mozambique, Malawi and Angola have disappeared. The origins of the 'genetic erosion' coincided with colonial rule in Africa and the popularity of big game hunting. From the second half of the 20th century, however, poaching for horns has dramatically depleted their population and genetic diversity, especially in Kenya and Tanzania.

From the second half of the 20th century what has caused a dramatic fall in black rhinoceros population?

In which of the following animals is respiration done by skin?

Improve the bracketed part of the sentence.

Perhaps a greater challenge they face is (improving the wounds of the civil war), Iraq is a divided country today.

If a sum of money at simple interest doubles in 6 years, it will become  4 times in

Who has become the first Indian woman to scale Mount Everest for the fourth time  ? 

Improve the bracketed part of the sentence.

The footballers (has been) arguing with the coach since morning.

Panchayatiraj form of rural government was first adopted by 

Which of the following is present in the largest amount in terms of percent by mass in the earth's crust