Unique Academic Board Solutions for Exercise 2: Previously Asked Questions

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

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

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 adds/add carbon dioxide to the carbon cycle on the planet Earth?
1. Volcanic action            2. Respiration
3. Photosynthesis            4. Decay of organic
Select the correct below:

Which one of the following is the best description of the term 'ecosystem'?

What can be the impact of excessive/inappropriate use of nitrogenous fertilisers in agriculture?
1. Proliferation of nitrogen-fixing microorganisms in soil can occur.
2. Increase in the acidity of soil can take place.
3. Leaching of nitrate to the ground-water can occur.
Select the correct answer using the code given below:

Consider the following:
1. Carbon monoxide
2. Methane
3. Ozone
4. Sulphur dioxide
Which of the above are released into atmosphere due to the burning of crop/biomass residue?