Phloem in angiosperms is composed of all the following except:
1. Sieve cells
2. Companion cells
3. Phloem parenchyma
4. Phloem fibers
The nucleus of companion cells controls the functions of:
1. Sieve cells
2. Sieve tubes
3. Albuminous cells
4. Phloem parenchyma
Phloem fibers [bast fibers] are:
1. | made up of collenchyma and generally not seen in primary phloem |
2. | made up of collenchyma and generally not seen in secondary phloem |
3. | made up of sclerenchyma and generally not seen in primary phloem |
4. | made up of sclerenchyma and generally not seen in secondary phloem |
Which of the following components of the phloem tissue in angiosperms loses protoplasm and becomes dead at maturity?
1. Sieve tube elements | 2. Companion cells |
3. Phloem parenchyma | 4. Phloem fibers |