Tissues — Science STD 9 — Question

Where and how are clouds formed?

Name the following:

1. Smallest cell organelle.
2. Largest cell organelle.
3. ER studded with ribosomes.
4. Functional segments of the DNA molecule.

Why antibiotics effective against bacteria but not against viruses?

What provisions are made by local authorities for solid waste management ?

In a cluster of hutments, many people are suffering from malaria. Mention the unhygienic conditions that must be prevailing in that locality. How does a doctor confirm malaria?

Write a note on kingdom Fungi.

Name the plant tissue which show the following features?

1. Made up of living cells showing thickening; provide mechanical support to the plant.
2. Made up of dead cells showing thickening; provide mechanical support to the plant; are made of one type of cells.
3. Made up of living cells containing green coloured chloroplasts, possesses intercellular space.

1. Name the phenomenon which helps fresh water unicellular organisms (e.g. Amoeba) continuously gain water in their bodies. Also, name the mechanisms by which these organisms throw out excess of water from their bodies.
2. Give at least two examples in plants where similar phenomenon in used to gain water.

Describe structure and functions of Golgi apparatus.