Changes Around Us: Physical and Chemical — Science STD 7 — Question

What are sea the sea and the land breeze?

Consider the following organisms
Grass, birds, frog, crow, tiger, vulture, toadstool, deer.
Which of these
(i) can eat the dead animals?
(ii) can form a three step food chain?

What is water cycle?

Give examples of unisexual flower.

Choose the odd one out from each group and give reasons. stomach, liver, pancreas, salivary gland.

Explain how painting of an iron gate prevents it from rusting.

Silk fibre belongs to which class of organic substance?

In a mercury thermometer, the level of mercury rises when its bulb comes in contact with a hot object. What is the reason for this rise in the level of mercury?

Name the three types of cells present in blood.

Is the image formed by a plane mirror is always upright?