The hormone synthesized in senescent leaves and flowers, germinating seeds and ripening fruits is ______

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Solution

Ethylene is a gaseous plant hormone that helps in accelerating senescence, ripening of fruits, initiating germination in certain seeds, and more.

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Name a plant hormone that helps in ripening of fruits.

Q. Give examples of 3 plants that have :
(a) spiny fruits
(b) spiny stem
(c) red flowers
(d) yellow flowers
(e) leaves which close at night
(f) single-seeded fruits
(g) many-seeded fruits

Q. Match the terms to these definitions.
Abscission, apical dominance, biological dock, circadian rhythm, vernalization, dormancy, ethylene, germination, gibberellin, geotropism, photoperiodism, senescence
.......... Dropping of leaves, fruits, or flowers from a plant.

Q. Ethylene is present in the tissues of ripening fruits, nodes of the stem, ageing leaves and flowers.

Plant hormones show various actions and visible effects on plants. They also help in the conduction of vital activities of plant-like phototropism, negative geotropism, growth, ripening of fruits etc. Each hormone shows particular action and visible effect on plants. Consider the given action and visible effects of hormones on plants and select the specific hormone responsible for these activities.

Hormones	Action	Visible effect
A	Cell elongated under turgor pressure	Tips bends towards light.
B	Growth of cells	Growth of plants, germination of seeds, flowering, and fruits enlargements.
C	Antagonizes auxins on leaf buds promotes cell division and differentiation	Growth of lateral branches
D	Growth inhibition	Seed dormancy and vernalization and drought tolerance
E	Fruits ripening and leaf drop	Increased sugar in fruit, leaf, and fruit drop.

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Ethylene

Standard X Biology

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