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4

Which of the following is a modified stem for the protection of plants from browsing animals?

A. Tendrils

B. Thorns

C. Rhizome

D. Tuber

Correct Answer :

B. Thorns


Thorn is a stiff, sharp-pointed woody projection on the stem or other part of a plant. Thorns are found in many plants such as Citrus, Bougainvillea. They protect plants from grazing animals.

Related Questions

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4

During the post-fertilization period, the ovules develops into ___A____ and the ovary matures into a ___B ____.

A. A - seeds; B - fruit

B. A - fruit; B - seeds

C. A - flower; B - seed

D. A - seeds; B - flower

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4

Match the following stem modifications given in column I with their examples given in column II and select the correct combination from the options given below.
(Stem Modifications)(Found in)
A. Underground stemI. Euphorbia
B. Stem tendrilII. Opuntia
C. Stem thornsIII. Potato
D. Flattened stemIV. Citrus
E. Fleshy cylindrical stemV. Cucumber

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

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

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

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

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4

The part of the root which is most active in water absorption is called

A. root cap

B. maturation zone

C. meristematic zone

D. zone of elongation

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4

Roots develop from parts of the plant other than radicle are called

A. tap roots

B. fibrous roots

C. adventitious roots

D. nodular roots

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4

Which of the following groups of plants have underground stems?

A. Potato, ginger, turmeric, Euphorbia, zaminkand

B. Potato, ginger, turmeric, zaminkand, Colocasia

C. Potato, Citrus, Opuntia, zaminkand, Colocasia

D. Potato, cucumber, watermelon, zaminkand, Colocasia

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4

Aleurone layer helps in

A. storage of food in endosperm.

B. protection of embryo.

C. utilization of stored food.

D. all of the above.

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4

The X is small and situated in a groove at one end of the endosperm. It consists of one large and shield shaped cotyledon known as Y and a short axis with a plumule and a Z. Identify X, Y and Z.

A. X - Scutellum, Y - Embryo, Z - Radicle

B. X - Embryo, Y - Scutellum, Z - Radicle

C. X - Scutellum, Y - Radicle, Z - Embryo

D. X - Radicle, Y - Embryo, Z - Scutellum

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4

Matching colmun I with column II and choose the correct option.
Column IColumn II
A. ColeorhizaI. Grapes
B. Food storing tissueII. Mango
C. Parthenocarpic fruitIII. Maize
D. Single seeded fruitIV. Radicle developing from monocarpellary superior ovary
E. MembranousV. Endosperm seed coat

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

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

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

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

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4

X is the outermost whorl of the flower and contains Y. Y is green, leaf like and protect the other whorls of the flower. Identify X and Y.

A. X - Calyx; Y - Sepals

B. X - Corolla; Y - Petals

C. X - Gynoecium; Y - Fruit

D. X - Androecium; Y - Ovary

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4

Which part of plant is generally green when young and later often become woody and dark brown?

A. stem

B. seed

C. leaves

D. flower

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4

Identify the inflorescence shown by the given figures A and B. 
q5

A. A-Cymose, B-Racemose

B. A-Racemose, B-Cymose

C. A-Racemose, B-Racemose

D. A-Cymose, B-Cymose

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4

Which is not a stem modification ?

A. Rhizome of ginger

B. Corm of Colocasia

C. Pitcher of Nepenthes

D. Tuber of potato

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4

The main purpose of phyllotaxy for the leaves is to provide sufficient_______.

A. soil

B. air

C. water

D. light

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4

Most prominent function of inflorescence is

A. dispersal of seeds.

B. formation of more fruits.

C. formation of pollen grains.

D. dispersal of pollens.

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4

Read the following statements and answer the questions.
  1. Gynoecium is situated in the centre and other parts of the flower are located on the rim of the thalamus almost at the same level.
  2. Ovary is half-inferior.
  3. Examples are plum, rose and peach.

Which condition of flowers is being described by the above statements ?

A. hypogyny

B. perigyny

C. epigyny

D. none of these

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4

Match the column I with column II and choose the option which shows their correct match.
Column IColumn II
A. Placentation(i) Arrangement of flowers on the rachis
B. Aestivation(ii) Modified shoot for sexual reproduction
C. Inflorescence(iii) Arrangement of various whorls in the bud
D. Flower(iv) Arrangement of ovules within an ovary

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

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

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

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

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4

Which one of the following option shows the correct labelling of the structure marked as A, B, C & D? 
q10

A. A - Gynoecium, B - Megasporophyll, C - Ovule, D - Thalamus

B. A - Gynoecium, B - Stamen, C - Seed, D - Thalamus

C. A - Microsporophyll, B - Stamen, C - Ovule, D - Thalamus

D. A - Gynoecium, B - Stamen, C - Ovule, D - Thalamus

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4

Identify the different types of aestivation (A, B, C and D) in corolla and select the correct option. 
q6

A. A-Valvate, B-Twisted, C-Imbricate, D-Vexillary

B. A-Vexillary, B-Valvate, C-Twisted, D-Imbricate

C. A-Imbricate, B-Vexillary, C-Valvate, D-Twisted

D. A-Twisted, B-Imbricate, C-Vexillary, D-Valvate

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4

A sterile stamen is known as

A. staminode

B. anther

C. pollen grain

D. filament

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4

Which of the following is not the characteristic features of fabaceae?

A. Tap root system, compound leaves and raceme inflorescence.

B. Flowers actinomorphic, twisted aestivation and gamopetalous.

C. Stamens 10, introrse, basifixed, dithecous.

D. Monocarpellary, ovary superior and bent stigma.

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4

Stilt roots occur in __________ .

A. groundnut

B. rice

C. sugarcane

D. wheat

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4

Match column I with column II and choose the correct option.
Column-IColumn-II
A. Bud in theI. Pitcher plant axil of leaf and venus fly trap
B. Outer layer ofII. Cacti seed coat
C. SpinesIII. Testa (modified leaves)
D. Leaves modifiedIV. Simple leaf to catch insects
E. Fleshy leavesV. Garlic and onion with stored food

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

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

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

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

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4

It is a proteinous layer and the outer covering of endosperm which separates the embryo. Identify the layer.

A. Tegmen

B. Scutellum

C. Hyaline layer

D. Aleurone layer

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4

The region of the root-tip whose cells undergo rapid elongation and enlargement and are responsible for the growth of the root in length is called the

A. region of maturation.

B. region of elongation.

C. region of meristematic activity.

D. root-hairs.

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4

The mature seeds of plants such as gram and peas, possess no endosperm, because

A. these plants are not angiosperms.

B. there is no double fertilization in them.

C. endosperm is not formed in them.

D. endosperm gets used up by the developing embryo during seed development.

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4

Identify the correct families of the given plant species (A, B and C) 
q14

A. A - Liliaceae, B - Compositae, C - Malvaceae

B. A - Fabaceae, B - Solanaceae, C - Liliaceae

C. A - Compositae, B - Malvaceae, C - Liliaceae

D. A - Solanaceae, B - Fabaceae, C - Liliaceae

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4

Seeds are regarded as products of sexual reproduction because they

A. can be stored for long time.

B. are result of fusion of pollen tube.

C. are result of fusion of gametes.

D. give rise to new plants.

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4

Prop roots of banyan tree are meant for

A. respiration.

B. absorption of water from soil.

C. providing support to big tree.

D. all of the above.

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4

Fibrous root system is found in

A. monocotyledonous plants.

B. dicotyledonous plants.

C. bryophytes.

D. gymnosperms.

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4

A branch in which each node bearing a rossette of leaves and a tuft of roots is found in aquatic plants like _________ and _________.

A. Hydrilla and Pistia

B. Eichhornia and Hydrilla

C. Pistia and Eichhornia

D. Pistia and Vallisneria