Primary xylem is of two types, they are-

1.	Protoxylem and metaxylem
2.	Xylem parenchyma and xylem fibres
3.	Tracheids and vessels
4.	Simple xylem and complex xylem

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

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

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

Resin, latex and mucilage are found in

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

Phloem fibres are made up of

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