Natural Resources — Science STD 9 — Question

Abdul, while driving to school, computes the average speed for his trip to be 20km h⁻¹. On his return trip along the same route, there is less traffic and the average speed is 30km h⁻¹. What is the average speed for Abdul’s trip?

In agricultural practices, higher input gives higher yield. Discuss how?

Why are leguminous crops desirable in crop rotation?

Name any three water pollutants.

Diagrammatically show the difference in three types of muscle fibres.

Why taking an antibiotic is not effective in the common cold?

Write down two main functions of:

1. Endoplasmic reticulum.
2. Lysosome.

Differentiate between sclerenchyma and parenchyma tissues. Draw a well-labeled diagram.

Non metals are usually poor conductors of heat and electricity. They are non-lustrous, non-sonorous, non-malleable and are coloured.

1. Name a lustrous non-metal.
2. Name a non-metal which exists as a liquid at room temperature.
3. The allotropic form of a non-metal is a good conductor of electricity. Name the allotrope.
4. Name a non-metal which is known to form the largest number of compounds.
5. Name a non-metal other than carbon which shows allotropy.
6. Name a non-metal which is required for combustion.