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Current Affairs January 2024

What is the correct answer?

4

Read the following statements and answer the question.
  1. It is the pattern of arrangement of leaves on the stem or branch.
  2. It is usually of three types - alternate, opposite and whorled.
  3. It is meant for getting maximum amount of light. statements?

A. Phyllotaxy

B. Venation

C. Inflorescencew

D. Aestivation

Correct Answer :

A. Phyllotaxy


The statements describe the phyllotaxy condition of plants. Phyllotaxy is the arrangement of leaves on an axis or stem. The facilitate the leaves to obtain maximum light for photosynthesis.

Related Questions

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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

Fibrous root system is found in

A. monocotyledonous plants.

B. dicotyledonous plants.

C. bryophytes.

D. gymnosperms.

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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

Fibrous root system is better adopted than tap root system for

A. transport of organic matter.

B. absorption of water and minerals.

C. storage of food.

D. anchorage of plant to soil.

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4

Floral features are chiefly used in angiosperms identification because

A. flowers are of various colours.

B. flowers can be safely pressed.

C. reproductive parts are more stable and conservative than vegetative parts.

D. flowers are good materials for identification.

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4

Alternate type of phyllotaxy is found in

A. china rose

B. mustard

C. sunflower

D. all of these

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4

When a flower has both androecium and gynoecium, it is known as__________.

A. asexual

B. bisexual

C. unisexual

D. multisexual

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4

Which of the following statement(s) is/are correct about calyx?

A. Calyx is the outermost whorl of the flower and are called sepals.

B. Sepals are green, leaf like and protect the flower in the bud stage.

C. The calyx may be gamosepalous (sepals free) or polysepalous (sepals united).

D. Both (a) and (b)

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4

Match the column-I containing types of aestivation with their examples given in column-II and choose the correct option.
Column - IColumn-II
(Type of aestivation)(Examples)
A. ValvateI. Cotton
B. TwistedII. Calotropis
C. ImbricateIII. Bean
D. VexillaryIV. Gulmohar

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

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

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

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

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4

Consider the following statements regarding the root system of angiosperms and choose the correct option given below.
  1. In monocots, the fibrous root system arises from the base of the stem.
  2. The region of elongation is called the root hair region.
  3. In sweet potato, the adventitious roots get swollen and store food.
  4. The stems of maize and sugarcane have supporting roots called prop roots.

A. (i) and (ii) are correct but (iii) and (iv) are wrong.

B. (ii) and (iii) are correct but (i) and (iv) are wrong.

C. (ii) and (iv) are correct but (i) and (iii) are wrong.

D. (i) and (iii) are correct but (ii) and (iv) are wrong.

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4

Which of the following statement(s) is /are correct?
  1. Many plants belong to family fabaceae are good ornamentals (Tulip, Gloriosa), source of medicine (Aloe) and vegetables (Asparagus).
  2. The plumule and radicle are enclosed in sheaths which are called coleorhiza and coleoptile respectively.
  3. A flower having either only stamens or only carpels is unisexual.
  4. Basal, alternate, linear, exstipulate with parallel venation types of leaves is found in the family liliaceae.

A. Only (i)

B. Both (i) and (ii)

C. Both (iii) and (iv)

D. All of these

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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

Study the following statements and select the correct option
  1. Buds are present in axil of leaflets of the compound leaf.
  2. Pulvinus leaf-base is present in some leguminous plants.
  3. In Alstonia, the petioles expand, become green and synthesize food.
  4. Opposite phyllotaxy is seen in guava.

A. (ii) and (iv) are correct but (i) and (iii) are incorrect.

B. (i) and (iii) are correct but (ii) and (iv) are incorrect.

C. (i) and (iv) are correct but (ii) and (iii) are incorrect.

D. (ii), (iii) and (iv) are correct but (i) is incorrect.

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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

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

Stilt roots occur in __________ .

A. groundnut

B. rice

C. sugarcane

D. wheat

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4

Which of the following is the green expanded part of leaf with vein and veinlets?

A. Petiole

B. Node

C. Stipule

D. Lamina

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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

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4

A scar on the seed coat through which the developing seeds attached to the fruit is called as ________.

A. testa

B. tegmen

C. hilum

D. micropyle

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4

The region of the stem where leaves are born are called ____________ while ____________ are the portions between two ____________.

A. nodes, nodes and internodes

B. nodes, internodes and nodes

C. internodes, nodes and nodes

D. internodes, internodes and nodes

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4

Which one of the following characteristics is not related to gynoecium?

A. It is the female reproductive part of the flower.

B. It is composed of stamens.

C. Stigma is usually at the tip of the style and is the receptive surface for pollen grains.

D. Each ovary bears one or more ovules attached to a flattened, cushion like placenta.

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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

Leaves of dicotyledonous plants possess _________ venation, while _________ venation is the characteristic of most monocotyledons.

A. reticulate and parallel

B. parallel and reticulate

C. reticulate and perpendicular

D. obliquely and parallel

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4

The main function(s) of root system is/are

A. absorption of water and minerals from the soil

B. storing reserve food material

C. synthesis of plant growth regulators

D. All of the above

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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

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

Main function of leaf is

A. exchange of gases

B. increase the beauty of a tree

C. manufacturing of food

D. nerve impulse induction

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4

Identify the kind of phyllotaxy shown in the given figures A, B, and C. 
q9

A. A-Alternate, B - Opposite, C - Whorled

B. A- Whorled, B - Opposite, C -Alternate

C. A-Alternate, B - Whorled, C - Opposite

D. A-Whorled, B -Alternate, C - Opposite

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4

The region of the root-tip which is involved in the formation of root hairs by epidermal cells is called the

A. region of maturation.

B. region of meristematic activity.

C. region of elongation.

D. none of the above.

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4

Statement-1 : Ginger has a prostrate-growing rhizome.
Statement-2 : Shoot growth is not effected by gravity.

A. Statement-1 and statement-2 are true and Statement-2 is a correct explanation for statement-1.

B. Statement-1 and statement-2 are true but statement-2 is a correct explanation for statement-1.

C. Statement-1 is true and statement-2 is false.

D. Both the statements are false.