Matter in Our Surroundings — Science STD 9 — Question

Common between ostrich, penguin and kiwi is that all are …...... birds,

1. Running.
2. Migratory.
3. Flightless.
4. Four toed.

What charge do protons have?

Cell wall of fungi is made up of:

Which of the following vibrates when a musical note is produced by the cymbals in an orchestra?

1. Stretched strings.
2. Stretched membranes.
3. Metal plates.
4. Air columns.

Growing different crops in the same field in a pre planned succession is:

1. Crop management.
2. Crop rotation.
3. Intercropping.
4. Plant breeding.

The structure which forms a barrier between the protoplasm of the cell and its external environment in an animal cell, is:

Identify the sub-atomic particle(s) with no charge and relative mass equal to one among the following:

Is the commonest carrier of pathogens:

1. Mosquito.
2. Housefly.
3. Helminth.
4. None of these.

Lysosome arises from: