Write one example each of the following tropic movements :
(a) Positive phototropism
(b) Negative phototropism
(c) Positive geotropism
(d) Negative geotropism
(e) Hydrotropism
(f) Chemotropism
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Write one example each of the following tropic movements :
(a) Positive phototropism
(b) Negative phototropism
(c) Positive geotropism
(d) Negative geotropism
(e) Hydrotropism
(f) Chemotropism
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Answer:
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Explanation:
positive phototropism:-The flower-stalks of this plant initially show positive phototropism until they have produced flowers.
Negative phototropism:-after fertilization the stalks curl up and eventually bury the developing pods under the soil, thus showing negative phototropism
Positive geotropism:-Primary roots and certain other portions of the root system tend to grow directly toward the centre of gravity
Negative geotropism:-Stem mostly grows away from the centre of gravity and is thus negatively geotropic.
hydrotropism:-The roots show positive hydrotropic response, i.e., they bend towards the water
chemotropism:-movement of Pollen tube towards ovary due to absorption of calcium and borate from style of carpel
Answer:
Positive phototropism ==stem
Negative phototropism ==root
Position geotropism======root
Negative geotropism ====stem
Hydrotropism============roots
Chemotropism =======growth of pollen tube through style
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