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PLANT GROWTH AND DEVELOPMENT
Study Material
PLANT GROWTH AND DEVELOPMENT
Very Short Answer Questions
Q1. Define plasticity. Give an example
Q2. What is the disease that formed the basis for the identification of gibberellins in plants? Name the causative fungus of the disease.
Q3. What is apical dominance? Name the growth hormone that causes it.
Q4. What is meant by bolting? Which hormone causes bolting?
Q5. Define respiratory climactic. Name the PGR associated with it.
Q6. What is ethephon? Write its role in agricultural practices.
Q7. Which of the PGRs is called stress hormone and why?
Q8. What do you understand by vernalisation?
Q9. Define the terms quiescence and dormancy.
Q1. Write a note on agricultural/ horticultural applications of auxins.
Q2. Write the physiological responses of gibberellins in plants.
Q3. Write any four physiological effects of cytokinins in plants.
Q4. What are the physiological processes that are regulated by ethylene in plants?
Q5. Write short notes on seed dormancy.
Q6. Which one of the plant growth regulators would you use if you are asked to (a) Induce rooting in a twig(b) Quickly ripen a fruit(c) Delay leaf senescence(d) Induce growth in axillary buds(e) 'Bolt' a rosette plant(f)Induce immediate stomatal closure in leaves(g) Overcome apical dominance (h) Kill dicotyledonous weeds
Q7. Describe briefly(a) Sigmoid growth curve(b) Absolute and relative growth rates.
Q1. List five natural plant growth regulators. Write a note on discovery, physiological functions and agricultural/ horticultural applications of any one of them.
Q1. Fill in the blanks with appropriate word/words.(a) The phase in which growth is most rapid is(b). Aptcal dominance. as expressed in dicotyledonous plants is due to the presence of more in the apical bud than in the lateral ones. C. In addition to auxin, a must be supplied to the culture medium to obtain a good callus in plant tissue culture.(d). of vegetative plants are the sites of photoperiodic perception.
Q2. Gibberellins promote the formation of flowers on genetically plants in Cannabis whereas ethylene promotes formation of genetically flowers on plants.
Q3. Classify the following plants into long- day plants (LDP), Short day plants (SDP) and Day Neutral Plants (DNP).Xanthium, Spinach, Henbane (Hyoscyamus niger), Rice, Strawberry. Bryophyllum, Sun- flower, Tomato, Maize.
Q4. A farmer grows cucumber plants In his field. He wants to increase the number of female flowers. Which plant growth regulator can be applied to achieve this?
Q5. Where are the following hormones synthesized in plants?(a). ??A(b). Gibberellins(c.) Cytokinins
Q6. Light plays an important role in the life of all organisms. Name any three physiological processes in plants which are influenced by light.
Q7. Growth is one of the characteristics of all living organisms. Do unicellular organisms also grow? If so, what are the parameters?
Q8. Rice seedlings infected with fungus Gibberella fujikuroi are called foolish seedlings. What is the reason?
Q9. Why isn't any one parameter good enough to demonstrate growth throughout the life of a flowering plant?
Q10. Both growth and differentiation in higher plants are open'. Comment.
Q11. Both a short day plant and a long day plant can produce flowers simultaneously in a given place'. Explain.
Q12. Would a defoliated plant respond to photoperiodic cycle? Why?
Q13. What would be expected to happen if:(a) GA, is applied to rice seedlings(b) Dividing differentiating cells stop(c) A rotten fruit gets mixed with unripe fruits(d) You forget to add cytokinin to the culture medium.