Plant Growth and Development

The Avena curvature is used for bioassay of

1. IAA
2. ethylene
3. ABA
4. GA3.

You are given a tissue with its potential for differentiation in an artificial culture. Which of the following pairs of hormones would you add to the medium to secure shoots as well as roots?

1. IAA and gibberellin
2. Auxin and cytokinin
3. Auxin and abscisic acid
4. Gibberellin and abscisic acid

Phytochrome is a

1. flavoprotein
2. glycoprotein
3. lipoprotein
4. chromoprotein

Auxin can be bioassayed by

1. potometer
2. lettuce hypocotyl elongation
3. Avena coleoptile curvature
4. hydroponics.

What causes a green plant exposed to the light, on only one side, to bend towards the source of light as it grows?

1. Light stimulates plant cells on the lighted side to grow faster.
2. Auxin accumulates on the shaded side, stimulating greater cell elongation there.
3. Green plants need light to perform photosynthesis.
4. Green plants seek light because they are phototropic.

Typical growth curve in plants is

1. stair-steps shaped
2. parabolic
3. sigmoid
4. linear.

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?

1. It made possible the isolation and exact identification of auxin.
2. It is the basis for quantitative determination of small amounts of growth-promoting substances.
3. It supports the hypothesis that IAA is auxin.
4. It demonstrated polar movement of auxins.

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?

1. Mutated
2. Embolised
3. Etiolated
4. Defoliated

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

1. Abscisic acid
2. Ethylene
3. GA3
4. Indole acetic acid

During seed germination its stored food is mobilized by

1. ABA
2. gibberellin
3. ethylene
4. cytokinin.

The pineapple which under natural condition is difficult to blossom has been made to produce fruits throughout the year by application of

1. NAA, 2,4-D
2. Phenyl acetic acid
3. Cytokinin
4. IAA, IBA.

Which of the following best illustrates "FEEDBACK" in development ?

1. As tissue (X) develops, it secretes something that induces tissue (Y) to develop
2. As tissue (X) develops, it secretes something that slows down the growth of tissue (Y)
3. Tissue (X) secretes RNA which changes the development of tissue (Y)
4. As tissue (X) develops, it secretes enzymes that inhibit the development of tissue (Y)

Through their effects on plant growth regulators, what do the temperature and light control in the plants?

1. Apical dominance
2. Flowering
3. Closure of stomata
4. Fruit elongation

Which one of the following generally acts as an antagonist to gibberellins?

1. Zeatin
2. Ethylene
3. ABA
4. IAA

Vernalization stimulates flowering in

1. zamikand
2. turmeric
3. carrot
4. ginger.

One of the commonly used plant growth hormones in tea plantations is

1. ethylene
2. abscisic acid
3. zeatin
4. indole-3-acetic acid

Root development is promoted by

1. abscisic acid
2. auxin
3. gibberellin
4. ethylene

Phototropic curvature is the result of uneven distribution of

1. gibberellin
2. phytochrome
3. cytokinins
4. auxin

Photoperiodism was first characterised in

1. tobacco
2. potato
3. tomato
4. cotton

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

1. thigmotaxis
2. thigmonasty
3. thigmotropism
4. thermotaxis

One of the synthetic auxin is

1. IAA
2. GA
3. IBA
4. NAA

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

1. Indole-3-acetic acid
2. Gibberellic acid
3. Abscisic acid
4. Indole butyric acid

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

1. cotton
2. Petunia
3. Lemna
4. tobacco

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

1. annual plants
2. floral parts
3. vessels and tracheid differentiation
4. leaf abscission

The wavelength of light absorbed by Pr form of phytochrome is

1. 680 nm
2. 720 nm
3. 620 nm
4. 640 nm

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

1. Gibberellic acid - Leaf fall
2. Cytokinin - Cell division
3. IAA - Cell wall elongation
4. Abscisic acid - Stomatal closure

Opening of floral buds into flowers, is a type of

1. autonomic movement of variation
2. paratonic movement of growth
3. autonomic movement of growth
4. autonomic movement of locomotion

An enzyme that can stimulate germination of barley seeds is

1. invertase
2. -amylase
3. lipase
4. protease

Farmers in a particular region were concerned that premature yellowing of leaves of a pulse crop might cause decrease in the yield. Which treatment could be most beneficial to obtain maximum seed yield?

1. Application of iron and magnesium to promote synthesis of chlorophyll
2. Frequent irrigation of the crop
3. Treatment of the plants with cytokinins along with a small dose of nitrogenous fertilizer
4. Removal of all yellow leaves and spraying the remaining green leaves with 2,4,5-trichlorophenoxyacetic acid

How does pruning help in making the hedge dense?

1. It releases wound hormones.
2. It induces the differentiation of new shoots from the rootstock.
3. It frees axillary buds from apical dominance.
4. The apical shoot grows faster after pruning.