Winds, Storms and Cyclones — Science STD 7 — Question

State the consequence when one food chain is disturbed in an ecosystem.

State the consequences, if plants do not get enough water.

Boojho had the following parts of a rose plant-a leaf, roots, a branch, a flower, a bud and pollen grains. Which of them can be used to grow a new rose plant?

Explain how the rotation of the Earth causes day and night.

Can a unisexual flower be self-pollinated?

Write the name of two indicators which occur naturally.

What are the four things essential for photosynthesis.

Wheat dough if left in the open, after a few days, starts to emit a foul smell and becomes unfit for use. Give reason.

Bleaching powder is mixed in water, why? Think and give appropriate reason for it.

What is hail?