Is Matter Around Us Pure? — Science STD 9 — Question

Name the tissue and write characteristic feature of following.
Has prominent middle lamella.

What is a mixture? Give two example of mixtures.

Name two factors on which shape of the cell depends.

Why do we feel lighter when we swim?

Name the following:

1. Simplest sponges.
2. Commonly known as bath sponge.

What would you observe when:
A mixture of iron filings and sulphur powder is heated strongly.

Describe a method to separate a mixture of camphor and sand.

A body floats in kerosene of density 0.8 × 10³ kg/m³ up to a certain mark. If the same body is placed in water of density 1.0 × 10³kg/m³, will it sink more or less? Give reason for your answer.

Give one example of each:

1. Asymmetry, radial symmetry and bilateral symmetry.
2. Acoelomate, pseudocoelomate and haemocoelomate.

Explain why do spinach look green, papaya yellow and edible part of water melon red?