Respiratory and Circulatory Systems — LOOKING AROUND ENVIRONMENTAL STUDIES STD 4 — Question

Gravitational force only pulls and never pushes.

Fish lay thousands of eggs but only a few hatch.

Cutting down of trees increases pollution.

Amphibians breathe through lungs when on land and through moist skin when in water.

Ice cubes, if kept in the open for some time, changes into water.

Plants growing in plains mostly have broad leaves.

What is gravity? How is it useful?

Classify the following fruits as growing on trees or bushes, and growing on creepers: [Apples, grapes, pears, muskmelons, chickoos, watermelons, pomegranates, mangoes, jujubes.]

Stars are glowing balls of fire but we cannot feel their heat.

We can understand the work that some people do by looking at the clothes they are wearing.