PLANT GROWTH AND DEVELOPMENT
1. Choose the appropriate function from the bracket and fill up the blanks against each plant hormone in the table. (2)
(Ripening of fruits, helps to overcome apical dominance, increase in length of stem in sugarcane, induction of parthenocarpy)
A Plant hormone |
B Function of the hormone |
Auxin |
………………………… |
Gibberellins |
………………………… |
Cytokinin |
………………………… |
Ethylene |
………………………… |
2. Grasses are capable of regeneration in spite of continuous grazing by cattle. Suggest the reason for it. (1)
3. Some wheat varieties are sown in the spring season and some are sown in the autumn season. Mention the physiological phenomenon responsible for it.
1. Comment on the following statements: (3)
a. Absicisic acid is also known as stress hormone.b. There are hormones promoting apical dominance and those acting against apical dominance.
1. Match the following: (3)
A |
B |
C |
Auxins |
Regain
the capacity of division |
Ripening
of fruit |
Gibberellin |
Stress
hormone |
Does
not occur naturally |
Cytokinin |
Gas |
Stomatal movement |
Dedifferentiation |
Kinetin |
Delay
senescence |
ABA |
IAA |
Cork
cambium |
Ethylene |
GA3 |
Apical
growth |
1. Label the phases of growth in the given growth curve. (1½)
1. Given below is the growth curve of a plant. Observe it and answer the questions.
b. Label A and C phases of growth in the growth curve. (1)
c. When the tip of cassava plant is lost, a number of lateral branches grow from the nodes below. Explain this phenomenon and specify the hormone responsible for this phenomenon. (1½)
1. Suggest the reason for the following: (2)
a. Farmers remove leaves of banana plants before planting.
2. Artificial phytohormones are widely used in agriculture. (2)
a. Name any two artificial phytohormones.
b. Mention their importance in agriculture.
1. Analyze the given statements and correct them with respect to the underlined words.
a. The site of perception of light by a plant for a photoperiodic response is a flower. (1)
2. Match the following: (4 x ½ = 2)
a)
Auxin |
i. Fruit ripening |
b)
Gibberellins |
ii. Stomatal closure |
c)
Cytokinins |
iii. Root initiation |
d)
Ethylene |
iv. Bolting |
|
v. Overcome apical dominance |
1. Given are certain physiological effects. Name the plant hormone responsible for it. (3)
a. Increase in stem lengthb. Apical dominancec. Closure of stomatad. Ripening of fruitse. Boltingf. Active cell division
1. By observing the relationship of the first pair, fill in the blanks of the second pair.
a. F.W. Went: Auxin E. Kurosawa: ………… (½)b. Auxins: Apical dominance………………: Overcome Apical dominance (½)
2. Which one of the plant growth regulators would you use if you are asked to do the following processes?
a. Induce parthenocarpyb. Quickly ripen a fruitc. Induce immediate stomatal closure in leavesd. To increase the length of grape stalks. (4 x ½ = 2)
1. In certain plants, a tolerance to various kinds of stresses such as severe drought can be overcome by the production of a hormone. Name this hormone. (1)
2. Observe the graph:
1. Apical dominance and bolting are two physiological phenomena shown by plants due to the activity of two growth regulators.
i) The growth regulators concerned are:
a) Apical dominance: …………b) Bolting ……….. (1)
ii) Distinguish between the two phenomena. (2)
2. In most of the plants, roots are meant for absorption and fixation. But there are exceptions to these functions. Justify the statement citing at least three examples. (3)
The main function of most of the stems is spreading out branches, bearing leaves, flowers and fruits and the conduction of materials. But there are exceptions to this. Justify the statement citing at least three examples.
1. Match the following: (3x1=3)
A |
B |
a)
Auxin |
i. Delay of leaf senescence |
b)
Gibberellin |
ii. Promotes senescence |
c)
Cytokinins |
iii.
Promotes bolting |
|
iv.
Apical dominance |
1. a) Identify the odd one from the given list of plant growth regulators.
b) List some physiological responses of gibberellins in plants. (3)
1. Who among the following scientists is related with the identification of cytokinins?
a) E. Kurosawab) F. Skoogc) C. Darwind) F.W. Went (1)
2. Write any four agricultural applications of ethylene. (2)
1. An enzyme present in plants, which shows carboxylation and oxygenation activity. Identify the enzyme. (1)
2. Ethylene is a gaseous hormone. Describe its four different actions in plants. (2)
1. Write a note on the phenomenon plasticity exhibited by plants with an example.
2. Plant growth regulators can be employed for various agricultural and horticultural practices. Identify the growth regulators that can be used following purposes.
a) To have weed free lawnsb) To increase sugarcane lengthc) Fruit set in pineapplesd) Rooting in stem cuttingse) Inhibiting seed germinationf) To promote female flowers in cucumber
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