Which one of the following pairs is not correctly matched?
1. Adenine derivative — Kinetin
2. Carotenoid derivative — ABA
3. Terpenes — IAA
4. Indole compounds — IBA
Choose the correct sequence of stages of growth curve for bacteria
1. lag, log, stationary, decline phase
2. log, lag, stationary phase
3. stationary, lag, log decline phase
4. decline, lag, log phase
What is true about phytochrome?
1. PR absorbs red light and becomes PFR
2. PR absorbs yellow light and becomes PF
3. PFR absorbs yellow light and becomes PR
4. PFR absorbs red light and becomes PR
Bakanae disease is caused by
1. Virus
2. Alga
3. Bacterium
4. Fungus
Hormone that promotes growth of lateral buds and has a negative effect on apical dominance is
1. Cytokinin
2. Gibberellin
3. Auxin
4. Both 2 and 3
Pick up the correct explanation
1. Tobacco — Long-day plant
2. Spinach — Short-day plant
3. Wheat — Short-day plant
4. Tomato — Day-neutral plant
Match the following and choose the correct combination
Column – I Column – II
A. Zeatin 1. Flowering hormone
B. Florigen 2. Natural auxin
C. Ethylene 3. Cytokinin
D. IAA 4. Gaseous hormone
A B C D
1. 3 4 1 2
2. 3 1 2 4
3. 1 2 3 4
4. 3 1 4 2
Match the Column I and Column II and select the correct option.
Column – I Column – II
A. Auxin 1. Herring sperm DNA
B. Cytokinin 2. Inhibitor of growth
C. Gibberellin 3. Apical dominance
D. Ethylene 4. Closure of stomata
E. Abscisic acid 5. Induces amylase synthesis
A B C D E
1. 3 1 5 4 2
2. 3 1 5 2 4
3. 2 1 5 3 4
4. 4 5 1 3 2
Cell elongation in the internodal regions of the green plants takes place due to
1. Indole acetic acid
2. Cytokinins
3. Gibberellins
4. Ethylene
Match the phytohormones given in column-I with their precursors given in column-II
Column-I Column-II
(Phytohormones) (Precursors)
A. Ethylene I. Violaxanthin
B. Cytokinins II. Methionine
C. Gibberellin III. t-RNA
D. Abscisic acid IV. Acetyl CoA
1. A(III), B(II), C(IV), D(I)
2. A(III), B(II), C(I), D(IV)
3. A(I), B(III), C(IV), D(II)
4. A(II), B(III), C(IV), D(I)
Auxin promotes the apical dominance whereas it is counteracted by__________.
Complete the statement by choosing the correct option.
1. Gibberellin.
2. Cytokinin.
3. Ethylene.
4. ABA.
Select the wrong statement.
1. In epigeal seed germination, hypocotyl grows first.
2. In a plant, the perception site of light/dark is the leaves.
3. Rate of respiration decreases rapidly during seed germination.
4. Vernalisation can help in shortening the period between germination and flowering.
Which one is odd with respect to LDP?
1. Wheat
2. Tobacco
3. Sugarbeet
4. Radish
Auxin (IAA) was first isolated from
1. Yeast.
2. Rhizopus.
3. Fusarium.
4. Human urine.
Which phytohormone is known as stress hormone?
1. Cytokinin.
2. Gibberellin.
3. Abscisic acid.
4. Ethylene.
Which phytohormone stimulates cell division and delays senescence?
1. Auxins.
2. Gibberellins.
3. Cytokinins.
4. Vernalins.
Which phytohormone is known as Anti GA hormone?
1. Ethylene
2. ABA
3. Cytokinin
4. Auxin
Avena coleoptile test is a bioassay of
1. Auxin activity.
2. Gibberellic acid (GA) activity.
3. Benzyl amino purine (BAP) activity.
4. Abscisic acid (ABA) activity.
What is the significance of vernalisation when it occurs naturally?
1. It gives enough time to plant to reach maturity.
2. It helps in shortening life-cycle of plant.
3. It is a physiological process to remove effect of photoperiodism.
4. It helps in overproduction without use of fertilizer.
Senescence and abscission of especially leaves and flowers are promoted by which PGR?
1. ABA
2. Ethylene
3. Auxin
4.