Phytochrome is a 

  • flavoprotein

  • glycoprotein

  • lipoprotein

  • chromoprotein

The Avena curvature is used for bioassay of 

  • GA3

  • IAA

  • Ethylene

  • ABA

Auxin can be bioassayed by

  •  Avena coleoptile curvature

  • hydroponics

  • potometer

  • lettuce hypocotyl elongation

What causes a green plant exposed to the light on only one side, to bend toward the

source of light as it grows?

  • Green plants need light to perform photosynthesis

  • Green plants seek light because they are phototropic

  • Light stimulates plant cells on the lighted side to grow faster

  • Auxin accumulates on the shaded side, stimulating greater cell elongation there

The most widely used compound as source of Ethylene is

  • Ethephon

  • Etiope

  • Ethyl Methyl carbon

  • Epitope

Dr. F Went noted that if coleoptile tips were removed and placed on agar for one hour, the agar would produce a bending when placed on one side of freshly cut coleoptile stumps. Of what significance is this experiment?

  • It made possible the isolation and exact identification of auxin.

  • It is the basis for quantitative determination of small amounts of growth-promoting substances

  • It demonstrated polar movement of auxins

  • It supports the hypothesis that IAA is auxin

A few normal seedlings of tomato were kept in a dark room. After a few days they were

found to have become white-coloured like albinos. Which of the following terms will you

use to describe them?

  • Mutated

  • Embolised

  • Etiolated

  • Defoliated

Which one of the following growth regulators is known as "stress hormone" ?

  • abscisic acid

  • Ethylene

  • GA3             

  • lndole acetic acid

During seed germination its stored food is mobilised by.

  • ethylene

  • cytokinin
  • ABA
  • gibberellin

Phototropic curvature is the result of uneven distribution of.

  • gibberellin

  • phytochrome

  • cytokinins

  • auxin

Photoperiodism was first characterised in :-

  • tobacco

  • potato

  • tomato 

  • cotton

Coiling of garden pea tendrils around any support is an example of 

  • thigmotaxis
  • thigmonasty 
  • thigmotropism
  • thermotaxis

One of the synthetic auxin is 

  • NAA

  • IAA

  • GA

  • IBA

Which one of the following acids is a derivative of carotenoids?

  • Indole-butyric acid

  • Indole-3-acetic acid

  • Gibberellic acid

  • Abscisic acid

Senescence as an active developmental cellular process in the growth and functioning of a flowering plant, is indicated in

  • vessels and tracheid differentiation

  • leaf abscission

  • annual plants

  • floral parts

Importance of day length in flowering of plants was first shown in 

  • Lemna

  • tobacco

  • cotton

  • Petunia

Opening of floral buds into flowers, is a type of:-

  • autonomic movement of locomotion

  • autonomic movement of variation

  • paratonic movement of growth

  • autonomic movement of growth

“Foolish seedling" disease of rice led to the discovery of:-

  • GA

  • ABA

  • 2,4-D

  • IAA

Which one of the following pairs, is not correctly matched?

  • Abscisic acid - Stomatal closure

  • Gibberellic acid - Leaf fall

  • Cytokinin - Cell division 

  • IAA - Cell wall elongation

How does pruning help in making the hedge dense:-

  • It induces the differentiation of new shoots from the rootstock

  • It frees axillary buds from apical dominance

  • The apical Shoot grows faster after pruning

  • It releases wound hormones

An enzyme that can stimulate germination of barley seeds is:-

  • α-amylase   

  • lipase

  • protease     

  • invertase

Vernalization is the process of

  • flower induction by high temperature treatment

  • inhabitation of flowering by low temperature treatment

  • flower induction by light treatment

  • acceleration of the ability of a plant to produce flowers by chilling treatment

Parthenocarpy in grapes is induced by:-

  • cytokinins

  • gibberellins

  • topoisomerases

  • primase

Phytochromes play a role in 

  • seed germination

  • flowering 

  • photomorphogenesis

  • photosynthesis.

Induction of flowering by low temperature in plants is 

  • cryobiology

  • vernalization 

  • phototropism

  • pruning.

Which of the following statements is correct regarding short day plants (SDPs)?

  • They can flower in complete darkness if supplied with exogenous nutrients.

  • They are the same as long day plants.

  • They do not have a critical photoperiod.

  • All of these.

Bud dormancy is induced by:-

  • ABA

  • ethylene

  • IAA

  • gibberellic acid.

Pruning of plants promotes branching because the auxillary buds get sensitized to:-

  • ethylene

  • gibberellin

  • cytokinin

  • indole acetic acid

Phytohormones are?

  • hormones regulating growth from seed to adulthood

  • growth regulators synthesised by plants and influencing physiological process

  • hormones regulating flowering

  • hormones regulating secondary growth

Refer the given figures on photoperiodism and select the correct option.
  • 1
  • 2
  • 3
  • 4
0:0:1


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