Prelims

In the grasslands, trees do not replace the grasses as a part of an eological succession because
of

Which one of the following is the correct sequence of ecosystems in the order of decreasing
productivity?

With reference to food chains in ecosystems, consider the following statements :
(1). A food chain illustrates the order in which a chain of organisms feed upon each other.
(2). Food chains are found within the populations of a species.
(3). A food chain illustrates the numbers of each organism which are eaten by others.
Which of the statements given above is/are correct?

Consider the following:
1. Photosynthesis
2. Respiration
3. Decay of organic matter
4. Volcanic action
Which of the above add carbon dioxide to the carbon cycle on earth?

Consider the following statements: 1. Biodiversity is normally greater in the lower latitudes as compared to the higher latitudes. 2. Along the mountain gradients, biodiversity is normally greater in the lower altitudes as compared to the higher altitudes. Which of the statements given above is/are correct?

Biodiversity forms the basis for human existence in the following ways:
1. Soil formation
2. Prevention of soil erosion
3. Recycling of waste
4. Pollination of crops
Select the correct answer using the code given below:

Some species of plants are insectivorous. Why?

Sustainable development is described as the development that meets the needs of the present without compromising the ability of future generations to meet their own needs. In this perspective, inherently the concept of sustainable development is intertwined with which of the following concepts?

From the point of view of evolution of living organisms, which one of the following is the correct sequence of evolution?

A pesticide which is a chlorinated hydrocarbon is sprayed on a food crop. The food chain is: Food crop – Rat -Snake – Hawk. In this food chain, the highest concentration of the pesticide would accumulate in which one of the following?