The Fundamental Unit of Life — Science STD 9 — Question

Which of the following have been artificially selected?

Cork cells are made impervious to water and gases by the presence of:

In angiosperms:

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

Choose the wrong statement:

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

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

Kranti, Pusa Agrani and pusa bold are improved varieties of:

1. Urad bean.
2. Sunflower.
3. Chick pea.
4. Mustard.

Onion peel is used to demonstrate:

Which one of the following fishes is a surface feeder?

1. Rohus
2. Mrigala
3. Common carps
4. Catlas

Delay in the observation of onion cells can lead to:

In higher chordates, notochord is transformed into:

1. Cranium.
2. Limbs.
3. Vertebral column.
4. Both (b) and (c).