Tissues — Science STD 9 — Question

Set up an experiment to demonstrate the effect of low pressure and particulate nuclei over water vapours.

Of the following components of phloem is non-living:

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

Layers continue to produce eggs upto:

1. 350 days
2. 425 days
3. 500 days
4. 600 days

AIDS virus has:

1. Single strand DNA.
2. Double strand DNA.
3. Single strand RNA.
4. Double strand RNA.

Greenhouse is related to:

1. Global warming.
2. Terrace gardening.
3. Kitchen garden.
4. Increase growth of algae.

Lysosomes are also called:

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

Active divisions take place in the cells of:

1. Xylem.
2. Phloem.
3. Sclerenchyma.
4. Cambium.