Mycorrhizal Biotechnology has been used in rehabilitating degraded sites because mycorrhiza enables the plants to -

1. Resist drought and increase absorptive area
2. Tolerate extremes of pH
3. Resist disease infestation

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With reference to the usefulness of the by-products of the sugar industry, which of the following statements is/are correct?

1. Bagasse can be used as biomass fuel for the generation of energy.
2. Molasses can be used as one of the feedstocks for the production of synthetic chemical fertilizers.
3. Molasses can be used for the production of ethanol.

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Ball bearings are used in bicycles, cars, etc., because

The known forces of nature can be divided into four classes, viz, gravity, electromagnetism, weak nuclear force and strong nuclear force. With reference to them, which one of the following statements is not correct?

Consider the following minerals -

1. Calcium
2. Iron
3. Sodium

Which of the minerals given above is/are required by the human body for the contraction of muscles?

Rainbow is produced when sunlight falls on drops of rain. Which of the following physical phenomena are responsible for this?

1. Dispersion
2. Refraction
3. Internal reflection

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