Lenticels are involved in

1. transpiration

2. gaseous exchange

3. food transport

4. photosynthesis

Age of a tree can be estimated by?

1. its height and girth

2. biomass

3. number of annual rings

4. diameter of its heartwood

The common bottle cork is a product of

(1) Dermatogens

(2) phellogen

(3) xylem

(4) vascular cambium

Companion cells are closely associated with

(1) sieve elements

(2) vessel elements

(3) trichomes

(4) guard cells

Closed vascular bundles lack

1. ground tissue

2. conjunctive tissue

3. cambium

4. pith

Water containing cavities in vascular bundles are found in

1. sunflower
2. maize
3. Cycas
4. Pinus

Ground tissues includes

In land plants, the guard cells differ from other epidermal cells in having:-

1. mitochondria

2. endoplasmic reticulum

3. chloroplasts

4. cytoskeleton

The cork cambium, cork and secondary cortex are collectively called

1. phellogen

2. periderm

3. phellem   

4. phelloderm

The chief water conducting elements of xylem in gymnosperms are

1. vessels

2. fibres

3. transfusion tissue

4. tracheids