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Biology Test 8 (Part - II)

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Which of the following is not a hormone?

  1. GA3

  2. Ethylene

  3. Phytochrome

  4. Auxins


Correct Option: C

The phenomenon of photoperiodism was discovered in a variety of

  1. tomato

  2. tobacco

  3. wheat

  4. rice


Correct Option: B

The term vernalization was coined by

  1. Gregory

  2. Melchers

  3. Lysenko

  4. Purvis


Correct Option: C

In vernalization, chilling treatment is given to the dormant seeds by keeping them at

  1. 15؛C to 20؛C

  2. 0؛C to 5؛C

    • 5؛C to 0؛C
    • 10؛C to - 5؛C

Correct Option: B

Which of the following prevents premature fall of the fruit?

  1. NAA

  2. Ethylene

  3. GA3

  4. Zeatin


Correct Option: A

Phytotron is a device by which

  1. electrons are bombarded

  2. protons are liberated

  3. plants are grown in controlled environment

  4. mutations are produced in plants


Correct Option: C

A plant hormone that induces morphogenesis in plant tissue culture is

  1. abscisic acid

  2. gibberellin

  3. cytokinin

  4. ethylene


Correct Option: C

Optimum growth occurs in

  1. blue light

  2. red light

  3. white light

  4. green light


Correct Option: C

Movement of auxin is

  1. centripetal

  2. basipetal

  3. acropetal

  4. both 2 and 3


Correct Option: B

Which of the following is a day neutral plant?

  1. Tobacco

  2. Tomato

  3. Wheat

  4. Oat


Correct Option: B

When a microspore mother cell with 40 chromosomes undergoes meiosis, each of the four resulting cells has

  1. 80 chromosomes

  2. 40 chromosomes

  3. 20 chromosomes

  4. 10 chromosomes


Correct Option: C

Meiotic division in an ovule takes place in

  1. nucellus

  2. megaspore mother cell

  3. megaspore

  4. archesporium


Correct Option: B

Male gametes are formed from

  1. generative cell

  2. tube cell

  3. body cell

  4. prothallial cell


Correct Option: A

The Polygonum type of embryo sac is

  1. bisporic eight-nucleate

  2. monosporic four-nucleate

  3. tetrasporic sixteen-nucleate

  4. monosporic eight-nucleate


Correct Option: D

If pollens of a flower fall on the stigma of another flower belonging to the same plant, it is

  1. ecologically cross-pollination

  2. genetically and ecologically cross-pollination

  3. genetically self-pollination and ecologically cross-pollination

  4. none of these


Correct Option: C

Make suitable pair:

 
A. Movement of curvature

a. Growth movement

B. Movement of locomotion

b. Turgor pressure

C. Movement of variation

c. Tactic movement

  1. Aa, Bb, Cc

  2. Ab, Ba, Cc

  3. Aa, Bc, Cb

  4. Aa, Bc, Ca


Correct Option: C
Explanation:

 Movement of curvature is due to growth movement. Movement of locomotion is due to tactic movement. Movement of variation is due to turgor pressure.

Synergids are

  1. tetraploid

  2. triploid

  3. diploid

  4. haploid


Correct Option: D

Insect-pollination flowers usually possess

  1. brightly coloured pollen

  2. dry pollens with smooth surface

  3. sticky pollens with rough surface

  4. large quantities of pollen


Correct Option: C

'Xenia' refers to the effect of pollen on

  1. endosperm

  2. flower

  3. somatic tissue

  4. root


Correct Option: A

Hydrophily is best demonstrated by

  1. nelumbium

  2. vallisneria

  3. eichhornia

  4. nymphaea


Correct Option: B

Lever mechanism or turn pipe mechanism for pollination is a characteristic feature of

  1. antirrhinum

  2. ocimum

  3. salvia

  4. ficus


Correct Option: C

The formation of fruits without fertilization is known as

  1. parthenocarpy

  2. parthenogenesis

  3. polyembryony

  4. polygamy


Correct Option: A

Maximum growth occurs in

  1. lag phase

  2. senescent phase

  3. exponential phase

  4. decline phase


Correct Option: C

Garner and Allard are related with

  1. photolysis

  2. photophosphorylation

  3. phototropism

  4. photoperiodism


Correct Option: D

The growth of pollen tubes towards ovules is due to

  1. geotropism

  2. thigmotropism

  3. chemotropism

  4. hydrotropism


Correct Option: C
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