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Which is the primary precursor of IAA in plants?
Concept: Plant Hormones >> Auxins
Name the cell which is responsible for nitrogen fixation in cyanobacteria.
Concept: Biogeochemical Cycles (Nutrient Cycles) >> Nitrogen Cycle
Abscisic acid is the common name given to two identical substances isolated separately. Name them.
Concept: Plant Hormones >> Abscisic Acid (ABA)
Give the chemical features of abscisic acid.
Concept: Plant Hormones >> Abscisic Acid (ABA)
Which hormone is responsible for fruit ripening?
Concept: Plant Hormones >> Ethylene
Abscission means ______.
Concept: Plant Mineral Nutrition
Write two applications of Auxins.
Concept: Plant Hormones >> Auxins
What is nitrification?
Concept: Biogeochemical Cycles (Nutrient Cycles) >> Nitrogen Cycle
Name any two nitrifying bacteria in soil.
Concept: Biogeochemical Cycles (Nutrient Cycles) >> Nitrogen Cycle
What are long-day plants (LDP)? Give two examples.
Concept: Photoperiodism
Which of the following is the only gaseous plant growth regulator?
Concept: Plant Hormones >> Ethylene
Complete the following box with reference to symptoms of mineral deficiency:
| Abscission | Pre-mature fall of flowers, fruits and leaves |
| ______ | Appearance of green and non-green patches on leaves |
Concept: Plant Mineral Nutrition
Give a reason – ABA is also known as an antitranspirant.
Concept: Plant Hormones >> Abscisic Acid (ABA)
Explain the role of chlorophyllase enzyme in banana.
Concept: Plant Hormones >> Ethylene
Name the hormone that is responsible for apical dominance.
Concept: Plant Hormones >> Auxins
A farmer wants to remove broad-leaved weeds from the jowar plantation in his field. Suggest any plant hormone to remove such weeds.
Concept: Plant Hormones >> Auxins
Write the physiological effects of Cytokinin.
Concept: Plant Hormones >> Cytokinins
What is gibberellins?
Concept: Plant Hormones >> Gibberellins
Identify the growth hormone in plants which causes inhibitory effect.
Concept: Plant Hormones >> Abscisic Acid (ABA)
What is differentiation?
Concept: Differentiation, De-differentiation, Re- Differentiation
