11th Standard Syllabus & Materials

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11th Standard Botany - Tissue and Tissue System Book Back Questions

Published on: 12/09/2019

Botany - Tissue and Tissue System

Download Tamil Nadu 11th Standard Biology question papers, model tests, one-mark questions, important questions, and public exam papers in PDF format. Free study materials and answer keys for TN State Board students.

Questions + Answers key

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Std: 11th Standard - Biology

chapter: - Model Question paper

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Questions:

Multiple Choice Question

3 x 1 = 3

Grafting is successful in dicots but not in monocots because the dicots have _______.

(a)

Vascular bundles arranged in a ring

(b)

Cambium for secondary growth

(c)

Vessels with elements arranged end to end

(d)

Cork cambium

When a leaf trace extends from a vascular bundle in a dicot stem, what would be the arrangement of vascular tissues in the veins of the leaf?

(a)

Xylem would be on top and the phloem on the bottom

(b)

Phloem would be on top and the xylem on the bottom

(c)

Xylem would encircle the phloem

(d)

Phloem would encircle the xylem

In Gymnosperms, the activity of sieve cells are controlled by _____.

(a)

Nearby sieve tube members

(b)

Phloem parenchyma cells

(c)

Nucleus of companion cells

(d)

Nucleus of albuminous cells

Generic 2

1 x 2 = 2

Why the cells of sclerenchyma and tracheids become dead?

Generic 5

2 x 5 = 10

Distinguish the anatomy of dicot stem from monocot stem.

What are Sieve tubes ? Explain.

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Answers Key:

Multiple Choice Question

3 x 1 = 3

(b)
Cambium for secondary growth

(a)
Xylem would be on top and the phloem on the bottom

Generic 2

1 x 2 = 2

The cells of sclerenchyma & tracheids become dead because they lack protoplasm

Generic 5

2 x 5 = 10

S.No. Characters Dicot Stem Monocot Stem 1. Hypodermis Collenchymatous Sclerenchymatous 2. Ground tissue Differentiated into cortex, endodermis and pericycle and pith Not differentiated, but it is a continuous mass of parenchyma 3. Starch Sheath Present Absent 4. Medullary rays Present Absent 5. Vascular bundles (a) Collateral and open (a) Collateral and closed (b) Arranged in a ring (b) Scattered in ground tissue (c) Secondary growth occurs (c) Secondary growth usually does not occur.

(i) Sieve tubes are long tube like conducting elements in the phloem.
(ii) These are formed from a series of cells called sieve tube elements.
(iii) The sieve tube elements are arranged one above the other and form vertical sieve tube.
(iv) The end wall contains a number of pores and it looks like a sieve hence called as sieve plate.
(v) These elements show nacreous thickenings on their lateral walls with simple or compound sieve plates.
(vi) The function of sieve tubes are believed to be controlled by companion cells.
(vii) In mature sieve tube, Nucleus is absent and it contains a lining layer of cytoplasm with special protein called slime body in it.
(viii) In mature sieve tubes, the pores in the sieve plate are blocked by a substance called callose.
(ix) The conduction of food material takes place through cytoplasmic strands.
(x) Sieve tubes occur only in Angiosperms.