Which type of cavity is  present within the vascular bundles of monocot stem

(1)air cavity

(2)water cavity

(3) Both A and B

(4) Food cavity

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
1. Albuminous cells and Sieve cells
2. Sieve tubes and companion cells
3. Phloem parenchyma and phloem fibres
4. None of the above

Function of sieve tubes are controlled by
1. Nucleus of sieve tube
2. Nucleus of companion cell
3. Nucleus of parenchyma
4. No function as they are dead cells

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
1. Phloem parenchyma
2. Xylem parenchyma
3. Phloem pits
4. None of the above

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
1. Parenchymatous cells
2. Sclerenchymatous cells
3. Collenchymatous cells
4. None of the above