The Discovery of PGRs

  • Four discovery were accidental one was with a planned experiment

  • Three discovery were accidental Two were with a planned experiment

  • Two discovery were accidental Three were with a planned experiment

  • .All five we're accidental

Phototropism is firstly studied by

1.Charles Darwin and his son Francis Darwin

2.Charles Darwin and his friend Francis Darwin

3.Charles Darwin and his brother Francis Darwin

4.Charles Darwin and his colleague Francis Darwin
  • 1
  • 2
  • 3
  • 4

……...is the site of transmittable influence that caused the bending of the entire……..

  • Coleorrhiza

  • Coleoptile

  • Auxin

  • Scutellum

Auxin was isolated by

  • F. W. Went

  • Charles Darwin

  • Francis Darwin

  • F. Skoog

Find the wrong match.

  • F. W. Went - Oat seedlings

  • Charles Darwin - Canary Grass

  • Francis Darwin - Canary Grass

  • E. Kurosawa- Orange

This picture suggests that

  • Tip of the coleorrhiza is the source of Auxin

  • Tip of coleoptile is the source of Auxin

  • Base of coleoptile is the source of Auxin

  • Base of coleorrhiza is the source of Auxin

Here arrows indicate

  • Source of Auxin

  • Direction of bending

  • Direction of light

  • Direction of cap removal

Foolish Seedling-

Find the odd one.

  • Bakane

  • Disease of Rice seedlings

  • Caused by viral pathogen

  • Gibberella fujikuroi

E. Kurosawa

  • Reported the appearance of symptoms of the disease in rice seedlings

  • In 1926

  • Used sterile filtrates of the fungus

  • All of these

Internodal segments of tobacco stems, the callus is actually

  • An undifferentiated cell

  • A mass of differentiated cell

  • A mass of undifferentiated cell

  • A differentiated cell

Find the incorrect statement.

F. Skoog and his co-workers obeserved that

  • Callus proliferated only if Auxin is there

  • Callus proliferated only if Auxin + extracts of vascular tissue was there

  • Callus proliferated only if Auxin + Yeast extract was there

  • Callus proliferated only if Auxin + coconut milk/DNA was there

Cytokinesis promoting substance was crystallised by

  • Skoog and Darwin

  • Skoog and Miller

  • Kurosawa

  • Cousins

Kinetin term was used for …..by…

  • Cytokinins, Darwin

  • Cytokinin, Skoog And Miller

  • ABA, Darwin

  • ABA, F. Skoog

Which of the following is not ABA?

  • Inhibitor-B

  • Abcission II

  • Dormin

  • Bakane

Three independent researches reported which of the following PGR?

  • ABA

  • Ethylene

  • Auxin

  • Cytokinin

Cousins confirmed the release of a volatile substance from ripened oranges that

  • Hastened the ripening of already ripened bananas

  • Hastened the ripening of unripened banana

  • Slowed the ripening of unripened bananas

  • Slowed the ripening of oranges

Auxin means

  • To escape

  • To slow

  • To grow

  • To fasten

Auxins was first isolated from

  • Human serum

  • Human urine

  • Human stool

  • Human saliva

Which of the following is not isolated from plants?

  • NAA

  • IAA3

  • IBA

  • GA3

Auxins

Find the odd one.

  • Initiate rooting in stem cuttings

  • Promote flowering e.g. Pineapples

  • Prevent fruit and leaf drop at early stages

  • Prevent the abscission of older mature leaves and fruits

In most higher plants, the growing apical bud inhibits the growth of …….. or axillary buds, a phenomenon called………….

  • Lateral, lateral Dominance

  • Lateral, Apical Dominance

  • Apical, Lateral Dominance

  • Apical, Apical Dominance

For tea plantations, hedge-making, which of the following PGR is used?

  • Auxins

  • Cytokinins

  • GA3

  • ABA

2,4-D widely used to

  • Kill dicot trees

  • Kill monocot weeds

  • Kill dicot weeds

  • Kill monocot shrubs

Which of the following is not a function performed by Auxin?

  • Controls Xylem differentiation

  • Helps in cell division and cell growth inhibition

  • Used as herbicide

  • Used to prepare weed free lawns by gardeners

Which of the following is not correct about Gibberellins?

  • Another kind of promotors PGR

  • There are more than 100 Gibberellins

  • Found in Fungi and higher plants

  • The first and most intensively studied form of Gibberellins is GA2

Which of the following is not a Physiological effect of Gibberellins?

  • Increase in the length of the grape stalks

  • They cause fruits like Apple to elongate and improve it's shape

  • They also delay senescence

  • They can shorten the market period for fruits

Which of the following is a Physiological effect of Gibberellins?

  • GA3 is used to speed up the malting process in brewing industry

  • They promote senescence

  • They shorten the market period

  • Induce parthenocarpy in tomatoes

Spraying sugarcane crop with gibberellins increases the length of the stem and increase the length by

  • 20 tonnes per Km

  • 20 tonnes per acre

  • 40 tonnes per acre

  • 40 tonnes per Km

Early seed production in…….. can be done by GAs

  • Pineapple

  • Grapes

  • Tomatoes

  • Conifers

Gibberellins does not  promote bolting in

  • Beet

  • Cabbage

  • Plants with rosette habit

  • Pineapple

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