Transport across Cells

Q.

Groups of cells working together to perform a specific function in organisms are called ___ .

Q.

In aquatic plants, large air cavities are present in parenchyma to give buoyancy to the plants to help them float. Such a parenchyma type is called __________ .

1. permanent tissue

2. aerenchyma

3. sclerenchyma

4. xylem

Q.

Assertion (A): Apoplast is a non-living system, while (B) symplast is a living system.
Reason (R): Apoplast uses intercellular spaces for movement, while symplast crosses the cell wall and cell membranes.

1. Both A & B are true and R explains A

2. Both A & B are true and R doesn't explain A

3. A is true and B is false

4. Both A & R are false

Q. The water essential for photosynthesis is absorbed by the and transported to all parts of the plant by the .

1. xylem
2. phloem
3. root
4. leaf
5. stem

Q.

Which of the following are the characteristics of muscular tissue?

1. Striated muscle fibre

2. Smooth muscle fibre

3. Neuron

4. Parenchyma cells

Q.

Food is ___ transported through the phloem to all parts of the plant.

1. uni-directionally

2. downwardly

3. bi-directionally

4. horizontally

Q.

Differences in the water potential in the cells of root epidermis is the driving force behind the movement of water to the root xylem.

1. True

2. False

Q.

Which of the following is/are methods by which water is transported across the plant?

1. They are live cells.
2. Parenchyma of stem and roots store nutrients and water.
3. It consists of relatively unspecialized cells with thin cell walls.
4. All of the above

Q. Aerenchyma cells are parenchymatous with air spaces between them.

Q. Xylem transport is unidirectional.

1. False
2. True

Q.

Aerenchyma assist the plants in

1. attachment to the soil bed

2. mechanical strength

3. floating in water

4. exchange of gases

Q.

Rise of water in roots at the cost of energy is called as

-diffusion

--osmosis

---capillarity

----active transport

Q. 'P-protein' is a constituent of

1. Sieve tube elements
2. Pericycle
3. Xylem parenchyma
4. Parenchyma

Q. Which one of the following is a non-protoplasmic cell inclusion?

1. Ribosomes
2. Mitochondria
3. Lysosomes
4. Cystoliths