Question 1

The main function of bulliform cells in grasses is :

Accepted Answer

Bulliform cells are large, empty, colourless cells present on the adaxial epidermis of grass leaves. When water is abundant, these cells absorb water, become turgid, and cause the leaf surface to be exposed. During water stress, they lose turgor pressure and become flaccid, which makes the leaves curl inwards to minimize water loss. Answer: to minimize water loss during water stress.

Question 2

Match List I with List II : List I List II A. Conjunctive tissue I. Specialised cells in the vicinity of guard cells B. Casparian strips II. Endodermal cells rich in starch C. Subsidiary cells III. Ti

Accepted Answer

Conjunctive tissue is the parenchymatous tissue present between the xylem and phloem in roots. Casparian strips are the water-impermeable, waxy suberin depositions present on the radial and tangential walls of endodermal cells. Subsidiary cells are the specialised epidermal cells present in the vicinity of guard cells. Starch sheath is the endodermis of a dicot stem, as its cells are rich in starch grains. Thus, the correct match is A-III, B-IV, C-I, D-II. Answer: A-III, B-IV, C-I, D-II

Question 3

Find the statement that is NOT correct with regard to the structure of monocot stem.

Accepted Answer

In monocot stem, hypodermis is sclerenchymatous.

Question 4

Which of the following simple tissues are commonly found in the fruit walls of nuts and pulp of pear?

Accepted Answer

Sclereids are commonly found in the hard parts of the plant such as fruit walls of nuts, or they occur in soft parts, i.e., pulp of the fruits, like pear.

Question 5

Given below are two statements: Statement I: In a dicotyledonous leaf, the adaxial epidermis generally bears more stomata than the abaxial epidermis. Statement II: In a dicotyledonous leaf, the adaxia

Accepted Answer

In a dicotyledonous leaf, adaxial epidermis (upper surface) generally bears very less stomata and may even lack stomata. It has less number of stomata in comparison to abaxial surface. The adaxially placed palisade parenchyma is made up of elongated cells, arranged vertically and parallel to each other.

Question 6

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 characterist of an

Accepted Answer

Collenchyma is also living tissue. Gymnosperm lack xylem vessels but presence of xylem vessels is the characteristic of angiospen

Question 7

Bulliform cells are responsible for

Accepted Answer

In grasses, certain adaxial epidermal cells along the veins modify themselves into large, empty, colourless cells. These are called bulliform cells. When the bulliform cells in the leaves have absorbed water and are turgid, the leaf surface is exposed. When they are flaccid due to water stress, they make the leaves curl inwards to minimise water loss.

Question 8

Formation of interfascicular cambium from fully developed parenchyma cells is an example for

Accepted Answer

The phenomenon of formation of interfascicular cambium from fully differentiated parenchyma cells is called dedifferentiation.

Anatomy of Flowering Plants — Previous Year Questions & Solutions