Management Of Natural Resources — Science STD 10 — Question

What is reactivity series of metals?

Out of xylem and phloem, which one carries materials:

1. Upwards as well as downwards?
2. Only upwards?

Explain why plaster of Paris should be stored in a moisture-proof container.

Rewrite the following statements after correction, if necessary:

1. Elements in the same period have equal valency.
2. The metallic character of elements in a period increases gradually on moving from left to right.

Focal length : Metre :: Power of a lens :………..

Organic waste is decomposed by micro-organism and as a result manure and……..are formed.

(1) Why do we have to bring a small object near the eyes in order to see it clearly?
(2) If we bring an object closer than 25 cm from the eyes, when can we not see it clearly even though it subtends a bigger angle at the eye?

Which one term in the following includes the others?
Air, flora, fauna, environment, water, sunlight, soil.

What is the purpose of Environmental Conservation Act, 1986?

What organs are attached to the two bronchi?