Improvement in Food Resources — Science STD 9 — Question

Sound is produced when:

Permanent tissues differ from meristematic tissue in:

1. Inability to divide.
2. Attainment of definite shape and size.
3. Performing a distinct function.
4. All the above.

Potential energy and kinetic energy are types of:

The term 'Fisheries' refers to ___________________:

Which of the following statements is not true for Nostoc:

Which of the following components of phloem is absent in monocot stem:

1. Sieve tubes.
2. Companion cells.
3. Bast fibers.
4. Phloem parenchyma.

Which of the following does not have a fixed melting point/ boiling point?

1. Gold.
2. Ethanol.
3. Air.
4. Oxygen.

The botanical name if Sunn hemp is:

1. Crotalaria juncea.
2. Lens culinaris.
3. Trifolium alexandrium.
4. Sesbania aculeate.

When a gas jar full of air is placed upside down on a gas jar full of bromine vapours, the red-brown vapours of bromine from the lower jar go upward into the jar containing air. In this experiment:

1. Air is heavier than bromine.
2. Both air and bromine have the same density.
3. Bromine is heavier than air.
4. Bromine cannot be heavier than air because it is going upwards against gravity.

The scientist who proposed the first letter (or first letter and another letter) of the Latin or English name of an element as its symbol, was: