Companion Cell

Q.

Which of the following tissues consist of living cells?

1. Tracheids

2. Companion cell

3. Sclerenchyma

4. Vessels

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. Providing water to phloem

4. Loading of sucrose into sieve elements

Q.

Companion cells are made up of

1. Collenchyma

2. Sclerenchyma

3. Parenchyma

4. Any of these

Q. Which of the following statements is/are true?
I. Protoxylem and metaxylem is found in secondary xylem
II. In exarch condition, the protoxylem is towards the periphery
III. Tracheids are the chief water transporting elements in gymnosperms
IV. Companion cell is devoid of the nucleus at maturity

1. I and IV only
2. II and III only
3. III and IV only
4. II and IV only

Q. Companion cells are associated with

1. cambium
2. xylem
3. sieve tubes
4. collenchyma

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

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. 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.

Companion cells are made up of

1. Collenchyma

2. Sclerenchyma

3. Parenchyma

4. Any of these