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Auxin can be bioassayed by
1. Lettuce hypocotyl elongation
2. Avena coleoptile curvature
3. Hydroponics
4. Potometer

Typical growth curve in plants is 
1. Parabolic
2. Sigmoid
3. Linear
4. Stair-steps shaped

What causes a green plant exposed to the light on only one side, to bend toward the source of light as it grows?
1. Auxin accumulates on the shaded side, stimulating greater cell elongation there
2. Green plants need light to perform photosynthesis
3. Green plants seek light because they are phototropic
4. Light stimulates plant cells on the lighted side to grow faster

A few normal seedings of tomato were kept in a dark room. After a few days they were found to have become whitecoloured 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. Abscissic acid
2. Ethylene
3. GA₃
4. Indole acetic acid

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

During seed germination its stored food is mobilized by
1. Cytokinin
2. ABA
3. Gibberellin
4. Ethylene

Through their effect 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

Vernalisation stimulates flowering in
1. Zamikand
2. Turmeric
3. Carrot
4. Ginger

Photoperiodism was first characterised in
1. Cotton
2. Tobacco
3. Potato
4. Tomato

Phototropic curvature is the result of uneven distribution of
1. Auxin
2. Gibberellin
3. Phytochrome
4. Cytokinins

Coiling of garden pea tendrils around any support is an example of
1. Thermotaxis
2. Thigmotaxis
3. Thigmonasty
4. Thigmotropism

One of the commonly used plant growth hormone is 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

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

Senescence as an active developmental cellular process in the growth and functioning of a flowering plant, is indicated in
1. Floral parts
2. Vessels and tracheid differentiation
3. Leaf abscission
4. Annual plants

Importance of day length in flowering of plants was first shown in
1. Petunia
2. Lemna
3. Tobacco
4. Cotton

“Foolish Seedling” disease of rice led to the discovery of
1. IAA
2. GA
3. ABA
4. 2, 4 – D

Opening of floral buds into flowers, is type of:
1. Autonomic movement of growth
2. Autonomic movement of locomotion
3. Autonomic movement of variation
4. Paratonic movement of growth

Which one of the following pairs, is not correctly matched?
1. IAA – Cell wall elongation
2. Abscissic acid – Stomatal closure
3. Gibberellic acid – Leaf fall
4. Cytokinin – Cell division

The wavelength of light absorbed by Pr form of phytochrome is
1. 660 nm
2. 720 nm
3. 620 nm
4. 640 nm

How does pruning help in making the hedge dense?
1. It induces the differentiation of new shoots from the rootstock
2. It frees axillary buds from apical dominance
3. The apical shoot grows faster after pruning
4. It releases wound hormones

Treatment of seed at low temperature under moist conditions to break its dormancy is called :
1. Scarification
2. Vernalization
3. Chelation
4. Stratification

An enzyme that can stimulate germination of barley seeds is
1. $\mathrm{\alpha }$-amylase
2. Lipase
3. Protease
4. Invertase

Farmers in a particular region were concerned that pre-mature 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-trichlorophenoxy acetic acid

The ability of the venus flytrap to capture insects is due to :
1. Chemical stimulation by the prey
2. A passive process requiring no special ability on the part of the plant
3. Specialized “muscle-like” cells
4. Rapid turgor pressure changes