Subject: Ecological Theory

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?

With reference to the evolution of living organisms, which one of the following sequences is correct ?

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?

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:

With reference to the food chains in ecosystems, which of the following kinds of organism is/are
known as decomposer organism/organisms?
1.Virus
2.Fungi
3.Bacteria
Select the correct answer using the codes given below.

Which one of the following terms describes not only the physical space occupied by an
organism, but also its functional role in the community of organisms?