Tissues — Science STD 9 — Question

Robert Hook was the first person to see cells in:

When we change a feeble sound to a loud sound, we increase its:

The conversion of a solid into vapours without passing through the liquid state is called:

Plasma membrane is:

Grass stem elongates by the activity of:

1. Primary meristem.
2. Secondary meristem.
3. Intercalary meristem.
4. Apical meristem.

Tissue is formed by the combination of:

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

In hydrogen peroxide (H₂O₂), the proportion of hydrogen and oxygen by mass is:

The efferent part of neqron is:

When a gas jar containing colourless air is kept upside down over a gas jar full of brown-coloured bromine vapour, then after sometime, the brown colour of bromine vapour spreads into the upper gas jar making both the gas jars appear brown in colour. Which of the following conclusion obtained from these observations is incorrect?

1. Bromine vapour is made of tiny particles which are moving.
2. Air is made up of tiny particles which are moving.
3. The particles of bromine are moving but those of air are not moving.
4. Even though bromine vapour is heavier than air, it can move up against gravity.