Large, empty colourless cells of the adaxial epidermis along the veins of grass leaves are

Large, empty colourless cells of the adaxial epidermis along the veins of grass leaves are

In the figure, which component has thin outer walls and highly thicked inner walls?

Given below are two statements :
Statement I : Parenchyma is living but collenchyma is dead tissue.
Statement II : Gymnosperms lack xylem vessels but presence of xylem vessels is the characteristic of angiosperms.
In the light of the above statements, Choose the correct answer from the options given below:

Match list I with list II.

Grass leaves curl inwards during very dry weather. Select the most appropriate reason
from the following

You are given a fairly old piece of dicot stem and a dicot root. Which of the following anatomical structures will you use to distinguish between the two?

Tracheids differ from other tracheary elements in :

Read the following statements about the vascular bundles:
(A) In roots, xylem and phloem in a vascular bundle are arranged in an alternate manner along the different radii.
(B) Conjoint closed vascular bundles do not possess cambium
(C) In open vascular bundles, cambium is present in between xylem and phloem
(D) The vascular bundles of dicotyledonous stem possess endarch protoxylem
(E) In monocotyledonous root, usually there are more than six xylem bundles present
Choose the correct answer from the options given below:

Given below are two statements :
Statement I : Endarch and exarch are the terms often used for describing the position of secondary xylem in the plant body.
Statement II : Exarch condition is the most common feature of the root system.
In the light of the above statements, choose the correct answer from the options given below :

Large, empty colourless cells of the adaxial epidermis along the veins of grass leaves are