FREE NEET Biology Practice MCQ Test: Anatomy Of Flowering Plants Exercise 3 Questions Answers With Detailed Explanations [PDF]

Answer: (d)

Answer: (d)

Answer: (c)

Answer: (a)

Answer: (b)

Simple permanent tissue found in plants is Parenchyma and, xylem and phloem are complex permanent tissues. Epidermis is a part of epidermal tissue system.

Answer: (a)

Trichomes is a small hair or other outgrowth from the epidermis of a plant stem, typically unicellular and glandular. Trichomes that often cover the plant body are the result of divisions of epidermal cells. They may be branched or unbranched and soft or stiff. The trichomes help in preventing water loss due to transpiration. Transpiration is a process where plants absorb water through the roots and then give off water vapor through pores in their leaves.

Answer: (d)

Answer: (b)

Secondary cortex is also called phelloderm. Cork cambium. cork and secondary cortex are collectively called periderm.

Answer: (a)

Answer: (b)

The root apex and shoot apex are meristematic in nature. These meristematic tissues are embryonic in origin. It is primary in origin because it developes from embryonic tissues. It is also primary in function because it forms the primary structure of the plant cell, the root apex and shoot apex, that live till the death of the whole plant. Hence, plants have the feature of indefinite growth.

Answer: (c)

Answer: (b)

Lenticels are raised pores in the stem of a woody plant that allows gas exchange between the atmosphere and the internal tissues. Parenchymatous cells are usually present in cortex. The ground tissue system is divided into three main zones- cortex, pericycle and pith. The conjoint vascular bundles usually have the phloem located only on the outer side of the xylem.

Answer: (d)

Answer: (d)

Answer: (d)

Answer: (a)

The protoxylem differentiates in the parts of the primary body that have not completed their growth and differentiation. In fact in the shoot, the protoxylem matures among actively elongating tissues and is, therefore subjected to stresses. In the root, the protoxylem elements persist longer because here they mature beyond the region of maximum growth. In this differentiation annular and spiral thickening take place.

Answer: (a)

Answer: (c)

Divisions of cells in both primary as well as secondary meristems, the newly formed cells become structurally and functionally specialized and lose the ability to divide. Such cells are termed as permanent or mature cells and constitute the permanent tissues.

Answer: (d)

In most of the gymnosperms, like conifers and cycads, vessels are absent and the wood is made entirely of tracheids. Such wood is known as nonporous. In angiosperms, on the other hand, the wood consists of both tracheids and vessels. The wide vessels appear as pores between otherwise small sized tracheary elements. Such a wood is known as porous. In porous wood, if vessels have essentially equal diameters and are uniformly distributed throughout the ring, the wood is known as diffuse porous. It is characteristic of plants growing in tropics.

Answer: (b)

Collenchyma is living mechanical tissue, found beneath the epidermis (i.e., hypodermis) of herbaceous dicot stem. The intercellular spaces in this tissue are absent because in intercellular spaces at the corner of cells thickenings of cellulose and pectin develop due to which the cell wall become rigid and thick at corners.