What is the role of medullary rays in plants?

Assertion $\left(\mathrm{A}\right):$ The peripheral region of the secondary xylem is lighter in colour and is known as the sapwood (alburnum).

Reason $\left(\mathrm{R}\right):$ It is involved in the conduction of water and minerals from root to leaf.

The correct answer is:

The trees growing in temperature regions show clear demarcation between spring wood and autumn wood. This is because

*Note- The incorrect answer was marked. It has been changed. 

The dendrochronology is based on $\underline{ }$

The transverse section of a plant shows following anatomical features:

(a) Large number of scattered vascular bundles surrounded by bundle sheath
(b) Large conspicuous parenchymatous ground tissue
(c) Vascular bundles conjoint and closed
(d) Phloem parenchyma absent

Identify the category of plant and its part:

Which of the following are the part of the Periderm?

I. Duramen

II. Phellogen

III. Phellem

IV. Phelloderm

V. Alburnum

The correct answer is

Match the following lists

The correct match is:

Assertion ($\mathrm{A}$): The spring wood has a greater number of Xylem vessels with wider lumens.

Reason ($\mathrm{R}$): During the spring season plant requires a large amount of water mineral salts.

Identify group of plants based on given anatomical characters in sequence.
$\mathrm{A})$ Bicollateral vascular bundles
$\mathrm{B})$ Bulliform cells
$\mathrm{C})$ Ring arrangement of vascular bundles

Answers respectively