Question

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​

Answer 1

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 2

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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