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What is the correct answer?

4

Lignin is the important constituent in the cell wall of

A. phloem

B. parenchyma

C. xylem

D. cambium

Correct Answer :

C. xylem


Lignin is the important constituent in the cell wall of xylem. Xylem consists of four different types of elements- tracheids, vessels, and xylem parenchyma and xylem fibres. Wall of tracheids are highly thickened by the deposition of lignin, except at certain points called as pits.

Related Questions

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4

Which one of the following option shows the correct labelling of the parts marked as A, B, C and D in the given figure of a typical dicot root?

A. A Primary phloem, B Vascular cambium, C Secondary phloem, D Primary xylem

B. A Secondary phloem, B Vascular cambium, C Primary phloem, D Primary xylem

C. A Primary phloem, B Primary xylem, C Secondary phloem, D Vascular cambium

D. A Secondary phloem, B Primary xylem, C Primary phloem, D Vascular cambium

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4

Match column-I with column-II and select the correct option from the codes given below.
Column-IColumn-II
A. SteleI. Innermost layer of cortex
B. EndodermisII. Suberin
C. Casparian stripsIII. All the tissues exterior to vascular cambium
D. BarkIV. All the tissues inner to endodermis

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

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

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

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

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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

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

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4

A piece of wood having no vessels (trachea) must be belonged to

A. teak

B. mango

C. pine

D. palm

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4

Match the terms given in column I with their funciton given in column II and choose the correct option.
Column-IColumn-II
(Term)(Functions)
A. MeristemI. Photosynthesis, storage
B. ParenchymaII. Mechanical support
C. CollenchymaIII. Actively dividing cells
D. SclerenchymaIV. Stomata
E. Epidermal tissueV. Sclereids

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

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

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

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

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4

Cork is formed from

A. phellogen

B. vascular cambium

C. phloem

D. xylem

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4

Some vascular bundles are described as open because these

A. are surrounded by pericycle but not endodermis.

B. are capable of producing secondary xylem and phloem.

C. possess conjunctive tissue between xylem and phloem.

D. are not surrounded by pericycle.

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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

Xylem functions as a conducting tissue for water and minerals from _________to the ______and__________.

A. roots, stems, leaves

B. stems, roots, leaves

C. leaves, stems, roots

D. leaves, stems, leaves

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4

Identify types of vascular bundles in given figures A, B and C.

A. Radial; Conjoint closed; Conjoint open

B. Conjoint closed; Conjoint open; Radial

C. Conjoint open; Conjoint closed; Radial

D. Bicollateral; Concentric; Radial

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4

Which meristem helps in increasing girth?

A. Lateral meristem

B. Intercalary meristem

C. Primary meristem

D. Apical meristem

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4

Identify the types of simple tissue indicated by A, B, C and D and their function.

A. A Parenchyma, Photosynthesis, Storage and Secretion.

B. B Sclerenchyma Scleriods; Transport food material

C. C Collenchyma; Provides mechanical support to organs.

D. D Sclerenchyma Fibres; Provide Mechanical support to the growing parts of the plant such as young stem and petiole of a leaf.

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4

A narrow layer of thin walled cells found between phloem/ bark and wood of a dicot is

A. cork cambium

B. vascular cambium

C. endodermis

D. both (a) & (c)

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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

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

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 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

In the given columns, column I contain structures of female reproductive system and column II contain its feature. Select the correct match.
Column-IColumn-II
A. Lateral meristem(i) Fascicular vascular cambium, interfascicular cambium and cork cambium.
B. Apical meristem(ii) Produces dermal tissue, ground tissues and vascular tissue.
C. Bast fibres(iii) Generally absent in primary phloem but found in secondary phloem.
D. Sap wood(iv) Involved in the conduction of water and minerals from the root to leaf.

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

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

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

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

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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

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

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

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

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

A. origin

B. function

C. position

D. development

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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

Main function of lenticel is

A. transpiration

B. guttation

C. gaseous exchange

D. both (a) & (c)

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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

When we peel the skin of a potato tuber, we remove

A. periderm

B. epidermis

C. cuticle

D. leaves

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4

A student was given a tissue to observe under the microscope. He observes the tissue and concludes that the tissue is a type of simple plant tissue and provides mechanical support to young stem and petiole of leaf.
Identify the tissue.

A. Parenchyma

B. Collenchyma

C. Sclerenchyma

D. Xylem parenchyma

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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