Tissues — Science STD 9 — Question

The conversion of NO₃ to N₂ is called:

1. Nitrification.
2. Denitrification.
3. ammonification.
4. Nitrogen fixation.

Whichofthefollowingisatypeofcell?

Sex organs are unicellular and non-jacketed in:

1. Algae.
2. Bryophytes.
3. Pteridophytes.
4. Gymnosperms.

Which of the labeled parts of the cell is its controlling centre:

Find out incorrect sentence:

Grass stem elongates by the activity of:

Simple epithelium is a tissue in which cells are:

1. Hardened and provide support to organs.
2. Continuously dividing to provide to form an organ.
3. Cemented directly to one another to form a single layer.
4. Loosely connected to one another to form an irregular layer.

Which of the following is a bacterial disease?

1. Hepatitis B.
2. Poliomyelitis.
3. Tetanus.
4. Malaria.

In angiosperms:

1. Xylem possess vessels.
2. Phloem has sieve tubes and companion.
3. Flowers are reproductive structures.
4. All the above.

Lysosomes are also called:

1. Suicide bags.
2. Digestive bags.
3. Demolition squads.
4. All the above.