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4

Which type of plant tissue is being described by the given statements?
  1. It consists of long, narrow cells with thick and lignified cell walls having a few or numerous pits.
  2. They are dead and without protoplasts.
  3. On the basis of variation in form, structure, origin and development, it may be either fibres or sclereids.
  4. It provides mechanical support to organs.

A. Parenchyma

B. Sclerenchyma

C. Collenchyma

D. Chlorenchyma

Correct Answer :

B. Sclerenchyma


The given statements are associated with sclerenchyma plant tissue. Sclerenchyma cells are strengthening tissue in a plant, formed from cells with thickened, typically lignified, walls. Such cells occur in many different shapes and sizes, but two main types occur: fibres and sclereids. Fibres are greatly elongated cells whose long, tapering ends interlock, thus providing maximum support to a plant. They can be found almost anywhere in the plant body, including the stem, the roots, and the vascular bundles in leaves. Sclereids are extremely variable in shape and are present in various tissues of the plant such as the periderm, cortex, pith, xylem, and phloem.

Related Questions

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4

As secondary growth proceeds, in a dicot stem, the thickness of

A. sapwood increases.

B. heartwood increase.

C. both sapwood and heartwood increases.

D. both sapwood and heartwood remains the same.

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4

Which one of the followings option shows the correct labelling of the parts marked as A, B, C and D in the given figure a lenticel?

A. A Epidermis, B Secondary cortex, C Cork cambium, D Cork

B. A Pore, B Cork cambium, C Secondary cortex, D Cork

C. A Pore, B Cork, C Complimentary cells, D Cork cambium

D. A Epidermis, B Complimentary cells, C Cork cambium, D Secondary cortex

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4

During the formation of leaves and elongation of stem, some cells left behind from the shoot apical meristem, constitute the

A. lateral meristem

B. axillary bud

C. cork cambium

D. fascicular cambium

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4

T.S. of dicot stem is given below, certain parts have been marked by alphabets (A I). Choose the option which shows their correct labelling.

A. A Epidermis, B Epidermal hair, C Parenchyma, D Starch sheath, E Hypodermis (collenchyma), F Vascular bundle, G Bundle cap, H Medulla or pith, I Medullary rays

B. A Epidermal hair, B Epidermis, C Hypodermis (collenchyma), D Parenchyma, E Endoderm is (Starch Sheath), F Pericycle, G Vascular bundle, H Medullary rays, I Medulla or pith

C. A Epidermal hair, B Epidermis, C Hypodermis (collenchyma), D Starch sheath, E Parenchyma, F Vascular bundle, G Bundle cap, H Medulla or pith, I Medullary rays

D. A Epidermal hair, B Epidermis, C Parenchyma, D Hypodermis (collenchyma), E Starch sheath, F Vascular bundle, G Bundle cap, H Medulla or pith, I Medullary rays

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4

An organised and differentiated cellular structure having cytoplasm but no nucleus is called _________.

A. vessels

B. xylem parenchyma

C. sieve tubes

D. tracheids

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4

Match the terms given in column I with their features given in column II and choose the correct option.
Column-IColumn-II
(Terms)(Features)
A. Fibres(i) Cells are living and thin walled with cellulosic cell wall, store food materials in the form of starch or fat
B. Sclereids(ii) Main water conductive cells of the pteridophytes and the gymnosperms
C. Tracheids(iii) Thick walled, elongated and pointed cells, generally occurring in groups
D. Vessels(iv) Long cylindrical tube like structure and cells are devoid of protoplasm. Characteristic feature of angiosperms
E. Xylem parenchyma(v) Reduced form of sclerenchyma cells with highly thickened lignified cellular walls that form small bundles of durable layers of tissue in most plants.

A. A - (i), B - (ii), C - (iii), D - (iv), E - (v)

B. A - (iii), B - (v), C - (ii), D - (iv), E - (i)

C. A - (iii), B - (i), C - (v), D - (ii), E - (iv)

D. A - (v), B - (iv), C - (iii), D - (i), E - (ii)

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4

In stems, the protoxylem lies towards the _____________ and the metaxylem lies towards the ____________ of the organ.

A. centre; periphery

B. periphery; centre

C. periphery; periphery

D. centre; centre

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4

The length of different internodes in a culm of sugarcane is variable because of

A. size of leaf lamina at the node below each internode

B. intercalary meristem

C. shoot apical meristem

D. position of axillary buds

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4

T.S. of dicot leaf passing through the midrib is given below. Certain parts have been marked by alphabets (A to H). Choose the option showing their correct labelling.

A. A Epidermis, B Spongy mesophyll, C Palisade mesophyll, D Stomata, E Guard cells, F Phloem, G Metaxylem, H Protoxylem

B. A Epidermis, B Palisade mesophyll, C Spongy mesophyll, D Sub-stomatal cavity, E Stoma, F Phloem, G Xylem, H Bundle sheath

C. A Epidermis, B Palisade mesophyll, C Spongy mesophyll, D Stomata, E Guard cells, F Epidermis, G Xylem, H Phloem

D. A Epidermis, C Palisade mesophyll, C Spongy mesophyll, D Stomata, E Guard cells, F Phloem, G Metaxylem, H Protoxylem

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4

Apical, intercalary and lateral meristems are differentiated on the basis of

A. origin

B. function

C. position

D. development

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4

In land plants, the guard cells differ from other epidermal cells in having

A. cytoskeleton.

B. mitochondria.

C. endoplasmic reticulum.

D. chloroplasts.

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4

Match column-I with column-II and choose the correct option.
A. Spring wood orI. Lighter in colour early wood
B. Autumn wood orII. High density late wood
..III. Low density
..IV. Darker in colour
..V. Larger number of xylem elements
..VI. Vessels with wider cavity
..VII. Lesser number of xylem elements
..VIII. Vessels with small cavity

Which of the following combination is correct ?

A. A II, IV, VII, VIII; B I, III, V, VI

B. A I, II, VII, VIII; B III, IV, V, VI

C. A I, III, V, VI; B II, IV, VII, VIII

D. A I, III, VII, VIII; B II, IV, V, VI

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4

Which of the following pair of match is not correct?

A. Pith - Large and well developed in monocotyledonous root.

B. Root hairs - Helps in preventing water loss due to transpiration

C. Sieve tube elements - Its functions are controlled by the nucleus of companion cells.

D. Stomatal apparatus - Consists of stomatal aperture, guard cells and surrounding subsidiary cells

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4

The given figure shows apical meristem of root apex with few part marked as A, B and C. Identify the correct labelling of A, B and C.

A. A Vascular structure, B Protoderm, C Root cap

B. A Cortex, B Endodermis, C Root cap

C. A Cortex, B Protoderm, C Root cap

D. A Tunica, B Protoderm, C Root cap

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4

Cork cambium and vascular cambium are

A. the parts of secondary xylem and phloem.

B. the parts of pericycle.

C. lateral meristems.

D. apical meristems.

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4

Which one of the following statement is incorrect ?
  1. Epidermal cell has small amount of cytoplasm and a large vacuole.
  2. Waxy cuticle layer is absent in roots.
  3. Root hairs are unicellular, while stem hairs / trichomes are multicellular.
  4. Trichomes may be branched or unbranched, soft or stiff and prevent transpiration.
  5. Guard cells are dumbell shaped in dicots and beanshaped in monocots (e.g. grass).

A. Only (i)

B. Only (iv)

C. Only (iii)

D. Only (v)

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4

The vessel elements of angiosperms differ from other elements of xylem in having

A. simple pits on their radial walls.

B. bordered pits on their lateral walls.

C. simple and bordered pits on their end walls.

D. simple perforation on their end walls.

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4

Match the followings and choose the correct option
Column-IColumn-II
A. CuticleI. Guard cells
B. Bulliform cellsII. Outer layer
C. StomataIII. Waxy layer
D. EpidermisIV. Empty colourless cell

A. A III, B IV, C I, D II

B. A I, B II, C III, D IV

C. A III, B II, C IV, D I

D. A III, B II, C I, D IV

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4

Tissue(s) present in an annual ring is/are

A. secondary xylem and phloem.

B. primary xylem and phloem.

C. secondary xylem only.

D. primary phloem and secondary xylem.

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4

The apical meristem of the root is present

A. in all the roots.

B. only in radicals.

C. only in tap roots.

D. only in adventitious roots.

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4

Which of the following process helps the trichomes in preventing water loss?

A. Where companion cells helps in maintaining the pressure gradient in the sieve tubes.

B. Where plants absorb water through the roots and then give off water vapor through pores in their leaves.

C. Where activity of cork cambium builds pressure on the remaining layers peripheral to phellogen and ultimately these layers dies and slough off.

D. None of the above

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4

Match the elements of xylem given in column I with their character given in the column II and choose the correct option.
Column-IColumn-II
A. Xylem vesselsI. Store food materials
B. Xylem tracheidsII. Obliterated lumen
C. Xylem fibresIII. Perforated plates
D. Xylem parenchymaIV. Chisel-like ends

A. A IV; B III; C II; D I

B. A III; B II; C I; D IV

C. A II; B I; C IV; D III

D. A III; B IV; C II; D I

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4

Trees at sea do not have annual rings because

A. soil is sandy.

B. there is climatic variation.

C. there is no marked climatic variation.

D. there is enough moisture in the atmosphere.

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4

Which of the following are present in monocot root ?

A. conjoint, collateral, open polyarch vascular bundle.

B. exodermis, endarch, tetrarch closed vascular bundles.

C. suberized exodermis, casparian strip, passage cells, cambium.

D. suberized exodermis, polyarch xylem, pith.

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4

Main function of lenticel is

A. transpiration

B. guttation

C. gaseous exchange

D. both (a) & (c)

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4

A plant tissue when stained showed the presence of hemicellulose and pectin in cells wall of its cells. The tissue is called

A. collenchyma

B. sclerenchyma

C. xylem

D. meristem

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4

T.S. of monocot leaf is given below, certain parts have been marked by alphabets (A G). Which one is the option showing there correct labelling?

A. A Adaxial epidermis, B Xylem, C Mesophyll, D Sub-stomatal cavity, E Abaxial epidermis, F Stoma, G Phloem

B. A Adaxial epidermis, B Abaxial epidermis, C Xylem, D Sub-stomatal cavity, E Stoma, F Mesophyll, G Phloem

C. A Adaxial epidermis, B Phloem, C Mesophyll, D Sub-stomatal cavity, E Abaxial epidermis, F Xylem, G Stoma

D. A Adaxial epidermis, B Xylem, C Stoma, D Substomatal cavity, E Abaxial epidermis, F Phloem, G Mesophyll

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4

Read the following statements and answer the question.
  1. It has a sclerenchymatous hypodermis, a large number of scattered vascular bundles and a large parenchymatous ground tissue.
  2. Vascular bundles are conjoint and closed.
  3. Peripheral vascular bundles are generally smaller than the centrally located ones.
  4. Phloem parenchyma is absent, and water- containing cavities are present within the vascular bundles.

Which plant anatomy is being described by the above statements?

A. Dicotyledonous root

B. Monocotyledonous root

C. Dicotyledonous stem

D. Monocotyledonous stem

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4

Which of following helps bamboo and grasses to elongate ?

A. Apical meristems

B. Lateral meristems

C. Secondary meristems

D. Intercalary meristems

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4

Identify A, B and C in the given figure of shoot apical meristem

A. A Leaf primordium, B Shoot apical meristem, C Axillary bud

B. A Leaf primordium, B Shoot apical meristem, C Apical bud

C. A Root hair primordium, B Root apical meristem, C Axillary bud

D. A Root hair primordium, B Root apical meristem, C Terminal bud