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There Are Three Plants A, B and C. the Flowers of Plant a Open Their Petals in Bright Light During the Day but Close Them When It Gets Dark at Night. on the Other Hand, the Flowers of Plant B Open Their Petals at Night but Close Them During the Day When There is Bright Light. the Leaves of Plant C Fold up and Droop When Touched with Fingers Or Any Other Solid Object. (A) Name the Phenomenon Shown by the Flowers of (I) Plant A, and (Ii) Plant B. (B) Name One Flower Each Which Behaves like the Flower of (I) Plant A, and (Ii) Plant B. (C) Name the Phenomenon Exhibited by the Leaves of Plant C. (D) Name a Plant Whose Leaves Behave like Those of Plant C. (E) Which Plant/Plants Exhibit the Phenomenon Based on Growth Movements? - CBSE Class 10 - Science

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Question

There are three plants A, B and C. The flowers of plant A open their petals in bright light during the day but close them when it gets dark at night. On the other hand, the flowers of plant B open their petals at night but close them during the day when there is bright light. The leaves of plant C fold up and droop when touched with fingers or any other solid object.
(a) Name the phenomenon shown by the flowers of (i) plant A, and (ii) plant B.
(b) Name one flower each which behaves like the flower of (i) plant A, and (ii) plant B.
(c) Name the phenomenon exhibited by the leaves of plant C.
(d) Name a plant whose leaves behave like those of plant C.
(e) Which plant/plants exhibit the phenomenon based on growth movements?

Solution

(a) The phenomenon shown by the flowers of plants A and B is photonasty.
(b) A flower which behaves like the flower of (i) plant A is dandelion and (ii) plant B is moonflower.
(c) The leaves of plant C exhibit thigmonasty.
(d) A plant whose leaves behave like those of plant C is Mimosa pudica.
(e) The plants A and B exhibit the phenomenon based on growth movements.

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APPEARS IN

 Lakhmir Singh Solution for Biology for Class 10 (2018 to Current)
Chapter 2: Control and Coordination
Q: 71 | Page no. 97

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Solution There Are Three Plants A, B and C. the Flowers of Plant a Open Their Petals in Bright Light During the Day but Close Them When It Gets Dark at Night. on the Other Hand, the Flowers of Plant B Open Their Petals at Night but Close Them During the Day When There is Bright Light. the Leaves of Plant C Fold up and Droop When Touched with Fingers Or Any Other Solid Object. (A) Name the Phenomenon Shown by the Flowers of (I) Plant A, and (Ii) Plant B. (B) Name One Flower Each Which Behaves like the Flower of (I) Plant A, and (Ii) Plant B. (C) Name the Phenomenon Exhibited by the Leaves of Plant C. (D) Name a Plant Whose Leaves Behave like Those of Plant C. (E) Which Plant/Plants Exhibit the Phenomenon Based on Growth Movements? Concept: Coordination in Plants - Movement Due to Growth.
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