Q4. Consider the following:

I. Cigarette butts
II. Eyeglass lenses
III. Car tyres

How many of them contain plastic?

Which of the following are nitrogen-fixing plants? 1. Alfalfa??2. Amaranth 3. Chick pea??4. Clover 5. Purslane (Kulfa)?6. Spinach Select the correct answer using the code given below:

In case of which one of the following biogeochemical cycles, the weathering of rocks is the main source of release of nutrient to enter the cycle?

Which one of the following is the best description of the term ‘ecosystem’?

Which of the following adds/add carbon dioxide to the carbon cycle on the planet Earth? 1. Volcanic action?2. Respiration 3. Photosynthesis?4. Decay of organic matter Select the correct answer using the code given below.

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?

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?

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

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

Which of the following leaf modifications occurs/occur in desert areas to inhibit water loss? 1. Hard and waxy leaves 2. Tiny leaves or no leaves 3. Thorns instead of leaves Select the correct answer using the codes given below.

Which of the following can be threats to the biodiversity of a geographical area? 1. Global warming 2. Fragmentation of habitat 3. Invasion of alien species 4. Promotion of vegetarianism Select the correct answer using the codes given below:

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 codes given below:

Three of the following criteria have contributed to the recognition of Western Ghats-Sri Lanka and Indo-Burma regions as hotspots of biodiversity: 1. Species richness 2. Vegetation density 3. Endemism 4. Ethno-botanical importance 5. Threat perception 6. Adaptation of flora and fauna to warm and humid conditions Which three of the above are correct criteria in this context?

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?

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 hotspots are located only in tropical regions 2. India has four biodiversity hotspots i.e., Eastern Himalayas, Western Himalayas, Western Ghats and Andaman and Nicobar Islands. Which of the statements given above is/are correct?

Consider the following regions: 1. Eastern Himalayas 2. Eastern Mediterranean region 3. North-western Australia. Which of the above is/are Biodiversity Hotspot(s)?

Which one of the following organisms is likely to show the highest concentration of DDT, once it has been introduced into the ecosystem?

The final Agent Orange raid in Vietnam took place in 1970– areas have begun to bloom again. But 19 years after the war’s end, it seems plain that Agent Orange is killing and maiming human beings, something it never intended to do. The apparent toxic fallout from those clouds–is a crop of human miseries including cancers, miscarriages and birth defects-that may persist for decades." The offensive substance referred to in this quotation is:

Which one of the following does provide the best estimate of world’s biological diversity?

Which of the following strongly threatens biodiversity?

Chlorophyll is a naturally occurring chelate compound in which central metal is

Which one of the following plants can fix nitrogen from air?

Match: List I List II A. Deforestation 1. Vacuoles B. Cellular structure 2. Maize C. Cross pollination 3. Soil erosion D. Nitrogen fixation 4. Legumes A B C D

Consider the following statements regarding ‘bioremediation’. It involves the use of bacteria and fungi to 1. Clean up aquifers 2. Clean up toxic dumps 3. Clean up oil spills 4. Cure bacterial and fungal disease

The type of crop which is able to fix nitrogen from air is known as

Plants take nitrogen in the form of

Photosynthesis generally occurs in which portions of the plant?

Why DDT is banned in western countries?

The final product of photosynthesis is

Which of the following is a weed killer?

Which of the following is an insecticide?

Chlorophyll is a/an

Green plants in the sea are useful for the respiration of fish because

Which of the following crops helps in nitrogen fixation?