Question answer of chemical coordination in plant ICSE class 10th
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Answer:
Chapter 7 Chemical Coordination in Plants
A. MULTIPLE CHOICE TYPE
1. A plant hormone related with inhibition of senescence is
(a) Ethylene (b) ABA
(c) Bromic acid (d) GA
(d) GA
2. Apical dominance phenomenon is caused by
(a) auxins (b) GA
(c) cytokinins (d) ABA
(a) auxins
3. Which of the following hormones regulate stomatal closure?
(a) auxins (b) GA
(c) ABA (d) cytokinins
(d) Cytokinins
4. Auxins are abundantly produced in:
(a) base of the root (b) base of the shoot
(c) shoot (d) meristematic region of the shoot
(d) meristematic region of the shoot
5. A higher concentration of ethylene is found in:
(a) green banana (b) ripe banana
(c) fresh potato tuber (d) green apple
(b) ripe banana
6. Common gibberellin is
(a) GA1 (b) GA2
(c) GA3 (d) GA7
(c) GA3
7. Stems are:
(a) positively geotropic and negatively phototropic
(b) positively geotropic and positively phototropic
(c) negatively geotropic and positively phototropic
(d) negatively phototropic and negatively geotropic
(c) negatively geotropic and positively phototropic
8. In tropic movements, plant parts move
(a) away from the stimulus
(b) towards the stimulus
(c) either towards or away from the stimulus
(d) only towards water
(c) either towards or away from the stimulus
B. SHORT ANSWER TYPE
1. Match the items in column A with those of column B.
Column A Column B
(a) Auxin (i) apical dominance
(b) Gibberellin (ii) cell-division
(c) Cytokinin (iii) fruit ripening
(d) Ethylene (iv) Internodal elongation
Column A Column B
(a) Auxin (i) apical dominance
(b) Gibberellin (iv) Internodal elongation
(c) Cytokinin (ii) cell-division
(d) Ethylene (iii) fruit ripening
2. Differentiate between:
(a) Thigmotropism and geotropism
Thigmotropism Geotropism
The growth movement of plants in response to a touch stimulus is called thigmotropism. Some interesting response is seen in response to touch. The term geotropism means growing towards the earth’s gravity. It also called gravitropism. Organs which grow towards the gravity are positively geotropic and those that grow away from the gravity are negatively geotropic.
(b) Phototropism and chemotropism
Phototropism Chemotropism
Phototropism means movement towards the light. The plants grown in light illuminating them from all direction grow more or less upwards. Chemotropism is the phenomenon of the growth of plant organs in response to chemicals.
3. How is the movement in plants different from that of animals?
Movement of body parts are common in animals, but in plants, movements are seen in the form of bending, twisting and elongation of certain parts. These movements are caused due to changes in the external as well as the internal factors of a plant. Such changes either in the external or internal environment of an organism are called stimuli and resulting actions or movements caused by the stimuli are called the response.
4. Name the stimulus which cause the following movements in plants:
Phototropism, thigmotropism, hydrotropism and geotropism.
Phototropism means movement towards the light.
Thigmotropism is the growing movement of plants in response to a touch stimulus.
Hydrotropism is the movement of plant parts in response to water or moisture.
Geotropism means growing towards the earth’s gravity.
5. Name the following.
(a) Hormone that stimulates growth by cell division.
The hormone that stimulates growth by cell division is cytokinin.
(b) Growth retarding hormone in plants.
Growth retarding hormone in plants is abscisic acid.
(c) Main auxin found in most plants.
IAA (Indole 3-acetic acid)