Decomposers are

• autotrophs

• autoheterotrophs

• organotrophs

• heterotrophs

What is the main cause for the extinction of some species in tropical forest?

• Deforestation

• Afforestation

• Pollution

• Soil erosion

53.

Biological concept of species is mainly based on

• reproductive isolation

• morphological features only

• methods of reproduction only

• morphology and methods of reproduction

Species can be identified on the basis of

• interbreed

• species diversity

• reproductive isolation

• None of the above

According to IUCN red list what is the status of red Panda (Athurus fulgens)?

• Vulnerable species

• Critically endangered species

• Extinct species

• Endangered species

Animals have the innate ability to escape from predation. Examples for the same are given below. Select the incorrect example

• enlargement of body size by swallowing air in puffer fish

• melanism in moths

• poison fangs in snakes

• colour change in chameleon

The plant that is characteristics component of mangrove vegetation

• Rhizophora mangel

• Ficus religiosa

• Mangifera indica

• Prosopis specigera

Biodiversity act of India was passed by the Parliament in the year

• 1996

• 1992

• 2002

• 2000

The species, which is going to become extinct due to lack of proper care would be called

• rare

• endangered

• vulnerable

• extinct

One of the following statements is incorrect with reference to biodiversity. Identify it.

• The areas with very few plant and animal species (low species richness) with no threatened species are called biodiversity hotspots.

• Biodiversity increases from higher altitudes to lower altitudes

• Biodiversity decreases from the equator to polar regions

• Depletion in genetic diversity of crop plants is mainly due to the introduction of better varieties with high yield, disease resistance, etc.