Force and Laws of Motion — Science STD 9 — Question

The nuclei of meristematic cells are:

An earth-like planet has a radius equal to double the earth's radius. The acceleration due to gravity on its surface will be:

If we release a magnet held in our hand, it falls to the ground. The force which makes the magnet fall down is an example of:

Which part of an atom is represented by the blue circles?

Intercellular connections in plant cells are called:

The boiling points of diethyl ether, acetone and n-butyl alcohol are 35°C, 56°C and 118°C, respectively. Which one of the following correctly represents their boiling points in kelvin scale:

Crop rotation helps in:

Among the following statement, point out the incorrect separation technique:

1. Separation of colloidal particles from solution-centrifugation.
2. Separation of two miscible liquids separating funnel.
3. Separation of pure substance from its impure form-crystallisation.
4. Separation of components with the help of same solvent-chromatogaphy.

Moon is revolving in a circular orbit with a uniform velocity V0​. If the gravitational force suddenly disappears, the moon will

The cell wall of which out of these is not made up of cellulose: