The Fundamental Unit of Life — Science STD 9 — Question

The common biofertilizers used in organic farming are:

The temperature remains constant during melting and all the ice changes into water. The enthalpy change associated with this process is due to _____________?

Centrosome occurs in:

Golgi apparatus is involved in synthesis of:

1. New membranes.
2. New membranes and lysosomes.
3. Cellulose.
4. Glucose.

A group of similar freely inter-breeding organisms constitutes a:

1. Species.
2. Genera.
3. Family.
4. Class.

Ozone hole over Antarctica appears during:

1. Spring.
2. Summer.
3. Autumn.
4. Winter.

Subatomic particles that are neutral in charge:

A homogeneous mixture is:

A satellite is launched in a circular orbit of radius R. Another satellite is also launched in an orbit of radius 1.1R. The period of the second satellite is larger than the first by approximately.

Colourless plastids are known as:

1. Leucoplasts.
2. Chromoplasts.
3. Chloroplasts.
4. None of the above.