Tissues — Science STD 9 — Question

While doing onion peeling experiment, what is the most common problem faced in it?

The cell organelles with membrane-bound cisternae located near the nucleus of the cell are:

Average size of human body cells is:

Which of the following is gaseous fumigant?

1. DDT.
2. Aluminium phosphide.
3. Ethylene dichloride.
4. Methyl bromide.

The term tissue was given by:

1. Robert Hooke
2. Mayer
3. Bichat
4. Leeuwenhoek

Wax glands of honey bee are present in:

1. Queen
2. Drones
3. Workers
4. Both (a) and (c).

Sun causes weathering of rocks through:

1. Mechanical force.
2. Physical phenomena.
3. Chemical changes.
4. Biological changes.

Phylum Chordata is named after the occurrence of:

1. Notochord.
2. Dorsal hollow nerve cord.
3. Occurence of postnatal tail.
4. Presence of gill slits.

A cell will swell up if:

What is the structural and functional unit of living organisms?