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1. Plant hormones are _________.
A. Growth regulators
B. Growth promoters
C. Growth inhibitors
D. None of above
ANSWER:A.Growth regulators
SOLUTION :Phytohormones or plant growth hormones are classified into plant growth inhibitors and plant growth promoters. While promoters promote cell division and enlargement, inhibitors inhibit growth and facilitate dormancy and abscission in plants.
2. The most common auxin is _________.
A. GA
B. ABA
C. Kinetin
D. IAA
ANSWER:D.IAA
SOLUTION:The most prevalent naturally occurring auxin in plants is Indole-3-Acetic Acid (IAA). Indole-3-Acetic Acid (IAA) is mostly synthesized in the apical buds of young shoots.
3. Gibberellin promotes cell division and elongation in ________.
A. Leaves
B. Roots
C. Shoots
D. All of these
ANSWER : D.All of these
SOLUTION:Thus gibberellins promote cell elongation in roots, shoots and leaves of a plant.
4. Which of the following is used for ripening of fruits ______.
A. Aukin
B. ABA
C. Ethylene gas
D. Cytokinin
ANSWER: C.Ethylene gas
SOLUTION: Ethylene is a colorless, gaseous plant hormone that plays a vital role in the natural ripening of fruits.
5. Induction of flowering in plants by low temperature treatment is called ________.
A. Vernalization
B. Photoperiodism
C. Cryobiology
D. Chilozology
ANSWER:A.Vernalization
SOLUTION:Vernalisation refers specially to the promotion of flowering by a period of low temperature.
6. Plant growth is ________.
A. Limited
B. Unlimited
C. Diffused
D. Both (1) & (2)
ANSWER: B.Unlimited
SOLUTION: Plant growth is unlimited, meaning plants can grow continuously throughout their lives. This is because plants have meristems in certain parts of their body, and the cells of these meristems can divide and self-perpetuate.
7. Hormone produced during leaf fall is ______.
A. IAA
B. ABA
C. Florigen
D. Kinetin
ANSWER:B.ABA
SOLUTION :
ABA hormone is formed during leaf fall. It is a growth inhibiting hormone in plants which accelerates aging and inhibits germination and flowering. It also causes the closing of stomatal pore.
8. Phytochrome is present in ___________.
A. Vascular cryptogams
B. Prokaryotes
C. Brain cell
D. Kidney cell
ANSWER: A.Vascular cryptogams
SOLUTION:Phytochrome is found in flowering plants as it is a blue-green pigment that is present in plants for the detection of light and regulates certain processes in plants such as seed germination, pigment synthesis and stem growth.
9. Certain chemical substances having profound effect on plant growth are called ______.
A. Catalyic agents
B. Phytohormones
C. Enzymes
D. Compost
ANSWER:B.Phytohormones
SOLUTION: Plant growth regulators are variously described as plant growth substances, plant hormones or phytohormones in literature.
10. A pigment concerned with floral induction is ______.
A. Florigen
B. Chlorophyll
C. Plastocyanin
D. Phytochrome
ANSWER: D.Phytochrome
SOLUTION:
Phytochrome is the pigment involved in floral induction and seed germination.