Question 1

A group of cells alike in form, function and origin is called:

Accepted Answer

Correct answer is C

Question 2

Shoot apical meristem is found on the tip of:

Accepted Answer

Correct answer is A

Question 3

Companion cells are closely associated with:

Accepted Answer

Companion cells are connected with sieve elements by complex plasmodesmata. The sieve tubes are syncytes and allow free diffusion of soluble organic substances. The callose also plays important role. Usually the perforations in the sieve plates are surrounded by callose. The callose is soluble and disappears when the solute is dilute so that the solute can pass from one cell to another cell through the pores.

Question 4

Tunica corpus theory was proposed by:

Accepted Answer

This theory was proposed by Schmidt (1924). This theory recognizes only two zones in the apical meristems.

Question 5

Histogen theory was proposed by:

Accepted Answer

This concept was given by Hanstein (1870). According to this, there are 3 groups of initials in the shoot apex.

Question 6

Parenchymatous cells filling the space between dermal and vascular tissue is:

Accepted Answer

Correct answer is A

Question 7

Tracheids differ from other tracheary elements in:

Accepted Answer

Vessel is a long cylindrical tube like structure made of many cells, called vessel members, each with lignified walls and a large central cavity. Vessel members are interconnected through perforation in their common walls.

Question 8

Parenchyma is:

Accepted Answer

Correct answer is D

Question 9

Which of the following statements is/are true: (A) Uneven thickening of cell wall is characteristic of sclerenchyma. (B) Periblem forms the cortex of the stem and the root.(C) Tracheids are the chief water transporting elements in gymnosperms.(D) Companion cell is devoid of nucleus at maturity.(E) The Commercial cork is obtained from Quercus suber.

Accepted Answer

Correct answer is D

Question 10

Specialised parenchyma cells which store tannins, oils and crystals of calcium oxalate are called:

Accepted Answer

Idioblasts : Those parenchymatous cells in which waste products e.g., gum, resin, sugar, starch is accumulated.

Question 11

A mature sieve tube differs from vessel in:

Accepted Answer

The walls of vessels are lignified and hard and not very thick. Sieve tubes have thin cellulose walls.

Question 12

From evolutionary point of view, tracheids and sieve cells are more primitive than tracheae and sieve tubes respectively. The angiosperms have:

Accepted Answer

Correct answer is B

Question 13

Wood is a common name of:

Accepted Answer

Technically, wood is secondary xylem formed by vascular cambium during secondary growth.

Question 14

At maturity the sieve plates become impregnated with:

Accepted Answer

Correct answer is D

Question 15

Consider the following statements and choose the correct option.(i) The thread like cytoplasmic strands, running from one cell to other is known as plasmodesmata.(ii) Xylem and phloem constitute the vascular bundle of the stem.(iii) The first form xylem elements are described as metaxylem.(iv) Radial vascular bundles are mainly found in the leaves.

Accepted Answer

Correct answer is D

Question 16

Which of the following statement is true?

Accepted Answer

Correct answer is B

Question 17

Intraxylary phloem may also be called:

Accepted Answer

Internal or intraxylary phloem : It originates fron procambium and is primary phloem which occurs os inner side of primary xylem. It is primary anamolou structure. e.g., Members of Apocynaceae, Solanaceae.

Question 18

Interfascicular cambium develops from the cells of:

Accepted Answer

Correct answer is B

Question 19

Active division takes place in the cells of:

Accepted Answer

Cambium represents lateral meristem of plant which has actively dividing cells.

Question 20

The only plant cells without nuclei among the following are:

Accepted Answer

In sieve tubes, nucleus is present only in young stage and without nuclei at maturity.

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