B&C

According to Robert May, the global species diversity is about

• 50 million

• 7 million

• 1.5 million

• 20 million

Which of the following is not a cause for loss of biodiversity?

• Destruction of habitat

• Invasion by alien species

• Setting up of zoological parks

• Over-exploitation of natural resources

Species diversity ______ as one moves from equator to pole.

• Increases

• Decreases

• first increases then decreases

• first decreases then increases

The extinction of passenger pigeon was due to

• increased number of predatory birds

• over exploitation by humans

• non-availability of the food

• deforestation

Which of the following is characterised by presence of less seasonal variations?

• Tropics

• Temperate

• Coniferous forests

• Deserts

Rivet popper hypothesis was given by

• Paul Ehrlich

• Alexander von Humboldt

• David Tilman

• Charles Darwin

Introduction of Nile Perch in Lake Victoria of South Africa resulted in

• excessive growth of water weeds

• elimination of water weeds

• elimination of many species of cichlid fish

• excessive growth of cichlid fish.

Read the following statements and select the correct answers.

Statement I: Out of every 10 animals on this planet, 7 are insects.

Statements II: The number of fungi species in the world is more than the combined total of the species of fishes, amphibians, reptiles and mammals.

• Only statement I is incorrect

• Only statement II is incorrect

• Both the statements are incorrect

• Both the statements are correct

Colombia has nearly 1,400 species of birds compare to New York which has 105 species, because Colombia

• Is situated at 41° N latitude

• Have more people involved in domestication of birds

• Is situated near the equator

• Exists somewhere in the mid of polar region

Tropical area has all the following characteristics, except

• More solar radiation available

• More constant and predictable environment

• Undergone frequent glaciations in the past

• Having greater species diversity