Function of sieve tubes are controlled by

The companion cells help in maintaining the ________ in the sieve tube.
1. Temperature gradient
2. Cellulose gradient
3. Pressure gradient
4. Ion gradient

Phloem parenchyma is absent in most of the
1. Dicotyledons
2. Monocotyledon
3. Desert plants
4. None of the above

Phloem in angiosperm is composed of

1. a,b,c,d
2. b,c,d,e
3. c,d,e,f
4. None

Phloem of gymnosperm consist of

In roots, the Protoxylem lies toward __________ and Metaxylem lies toward the _______ respectively.

Which component of Jute, Flax and Hemp are commonly used?

Phloem fibres are made up of

Resin, latex and mucilage are found in