Acids, Bases and Salts — Science STD 7 — Question

What is the end product of anaerobic respiration?

Fill in the blanks.

The rhythmic expansion and contraction of the heart is called ______.

Define wool.

Why should you breathe through your nose and not your mouth?

Name the process by which water molecules continuously change to vapour.

What do you meant by the white fleece of the lamb?

Give examples of some acids and bases.

Two organisms are good friends and live together. One provides shelter, water, and nutrients while the other prepares and provides food. Such an association of organisms is termed as:

What are the characteristics of a shadow?

Give the name of respiratory organs in following animals.

1. Fish.
2. Human being.