Companion Cell

Q.

Which of the following tissues consist of living cells?

1. Vessels

2. Companion cell

3. Sclerenchyma

4. Tracheids

Q. What is the function of companion cell?

1. Providing energy to sieve elements for active transport

2. Loading of sucrose into sieve elements by passive transport

3. Maintaining pressure gradient in sieve tube

4. Loading of sucrose into sieve elements

Q. Phloem in gymnosperms lacks:

1. Both sieve tubes and companion cells
2. Albuminous cells and sieve cells
3. Sieve tubes only
4. Companion cells only

Q.

Which of the following tissues consist of living cells?

1. Vessels

2. Tracheids

3. Companion cell

4. Sclerenchyma

Q.

Companion cells are made up of

1. Collenchyma

2. Sclerenchyma

3. Parenchyma

4. Any of these

Q. A living mechanical tissue having pecto cellulosic wall thickening is

1. Sclerenchyma
2. Collenchyma
3. Parenchyma
4. Aerenchyma

Q. Which of the following statement(s) regarding the companion cell is/are incorrect?
I. These are closely associated with vessels.
II. They help in loading sugar into the phloem.
III. They help in maintaining the pressure gradient in tracheids.

1. Only I
2. Only II
3. I and III
4. I, II and III