In dicot stem, at some places the cambium forms a narrow band of parenchyma which passes through the secondary xylem and secondary phloem in radial direction these are called _________.

(1) Secondary medullary rays

(2) Rays

(3) Primary medullary rays

(4) Tertiary medullary rays

Dicotyledonous leaf is also known as

(1)Dorsiventral leaf

(2)Bi-facial leaf

(3)Both A and B

(4)Isobilateral leaf

The main parts of the lamina of the dorsiventaral leaf are

(1)epidermis

(2)mesophyll tissues

(3)vascular system

(4)All of the above

The tissues present between the adaxial and abaxial epidermis are

(1)mesophyll

(2)chlorophyll

(3)vascular bundle

(4)Both A and C

Which of the following is true for palisade parenchyma?

1. adaxially placed

2. elongated cells

3. vertically and parallely placed

4. All of the above

Secondary growth is because of

1. vascular cambium

2. cork cambium

3. lateral meristem

4. All of the above

The cells which are formed from vascular cambium towards the centre are____________and towards the periphery are _________________

(1)secondary xylem, secondary phloem

(2)bast, wood

(3)wood, bast

(4)Both A and C

The secondary xylem is produced more because

(1)cambium is more active towards the inner side

(2)cambium is more active towards the outer side

(3)xylem is more important than phloem

(4)All of the above

Primary xylem remains less or more intact towards the __________

(1) around the centre

(2) around the periphery

(3)outer to the pith

(4)Both A and C

Secondary growth occurs in

(1)dicot root and stem of angiosperms

(2)dicot root and stem of gymnosperms

(3)monocot roots

(4)Both 1 and 2