IMPORTANT QUESTIONS

1. Q61 What are electropositive atoms ? How does electropositivity vary along the period in the modern periodic table?

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2. Q62 Give reason for the following. Ionic compounds have a high melting point and boiling point.

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3. Q63 What is meant by pollination ? Name and differentiate between the two types of pollination.

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4. Q64 Write the main function of the sensory neuron?

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5. Q65 Why are traits acquired during the lifetime of an individual not inherited?

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6. Q66 What is meant by saying that the potential difference between two points is 1 V?

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7. Q67 Mention the respiratory unit of lungs and excretory unit of kidneys.

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8. Q68 Major amount of water is selectively reabsorbed by the tubular part of nephron in humans. What are the factors on which the amount of water reabsorbed depends?

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9. Q69 What is the cause of dispersion of light on passing through a prism?

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10. Q70 Why is the Government of India imposing a ban on the use of polythene bags ? Suggest two alternatives to use these bags and explain how this ban is likely to improve the environment.

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