Questions

Improve the given sentence if necessary.

This book is the more interesting of the three.

The nitrogen atom has 7 protons and 7 electrons,The nitride ion will have

Who said, " I therefore, want freedom immediately, this very night, before dawn, if it can be had

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?

Improve the bracketed part of the sentence.

She (has fallen out with) the boy she was supposed to marry.

Improve the given sentence if necessary.

We are doing this in the interest of the poors.

A periscope works by the principle of

According to John Maynard Keynes, employment depends upon