Phytohormones and Plant Growth
This quiz covers phytohormones (auxins, gibberellins, abscisic acid, cytokinins, ethylene), their effects on plant growth and development, apical dominance, and plant growth regulators.
Questions
Abscisic acid causes _____________.
- faster leaf fall
- dormancy of tubers
- retardation of growth
- senescence of leaves
- all of the above are correct
IAA generally inhibits the growth of :
- roots
- leaves
- shoots
- whole plant
- seeds
What does hyponasty term refers to?
- Growth is less on the lower surface of the leaf.
- Growth is more on the lower surface of the leaves.
- There is no growth on the upper surface of the leaves.
- Growth is equal on both the surfaces.
- All the above are correct.
Synthesis of amylase in certain cereals is stimulated by which of the following?
- IAA
- GA
- ABA
- CK
- Ethylene
The rosette habit of cabbage can be changed drastically to vine by the application of _________.
- IAA
- GA
- CK
- ABA
- Ethylene
Growing point possess _____________.
- meristematic cells
- mature cells
- dead cells
- slowly enlarging cells
- growth inhibitors
Apical dominance in higher plants is due to _____________.
- balance between auxin and cytokinin
- enzymatic activity
- carbohydrate and nitrogen ratio
- photoperiodism
- the presence of apical dominance
Growth in the plant is measured by __________.
- potometer
- microscope
- auxanometer
- calorimeter
- manometer
What are the certain chemical substances having deep effect on growth called?
- Phytohormones
- Enzymes
- Vitamins
- Minerals
- None of the above
If a gardener is interested in obtaining a good crop of tea leaves from a single plant, what should he do?
- Feed auxin to the plant through soil.
- Remove the apical bud of the main shoot and the branches.
- Cut off the tip of the plant and then apply auxins to the cut end.
- Supply auxin from the tip of the plant as well as through roots.
- Not apply auxin at all.
Gibbrellin is obtained from__________.
- gibberella (an algae)
- gibberella (a fungus)
- basidiolichen
- bacterium
- virus
Which of the following is a natural growth regulator?
- Benzaldehyde
- NAA
- 2, 4-D
- Ethylene
- IBA
Which is the role not played by ethylene?
- Inhibition of elongation of stem.
- It increases the number of female flowers and reduces the number of male flowers.
- It causes ripening of fruits.
- It causes abscission of leaves.
- It increases maleness in some plants.
Which phytohormone is responsible for the bakanae disease of rice?
- Gibberellin
- Cytokinin
- Abscisic acid
- Auxin
- Ethylene
Which is not the specific function of auxin?
- Helps in apical dominance.
- Induces parthenocarpy
- Control of weeds
- Prevention of lodging
- Fruit ripening