Due to improper/indiscriminate disposal of old and used computers or their parts, which of the following are released into the environment as e-waste?

1. Beryllium 2. Cadmium 3. Chromium 4. Heptachlor 5. Mercury 6. Lead 7. Plutonium

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Improper handling and storage of cereal grains and oilseeds result in the production of toxins known as

aflatoxins which are not generally destroyed by normal cooking process . Aflatoxins are produced by

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

Consider the following:

1. Electromagnetic radiation

2. Geothermal energy

3. Gravitational force

4. Plate movements

5. Rotation of the earth

6. Revolution of the earth

Which of the above are responsible for bringing dynamic changes in the surface of the earth?

The Narmada river flows to the west, while most other large peninsular rivers flow to the east. Why?

1. It occupies a linear rift valley.

2. It flows between the Vindhyas and the Satpuras.

3. The land slopes to the west from central India.

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Variations in the length of daytime and nighttime fromseason to season are due to