Match the pairs and explain. 'A' 'B' 1. Growth of pollen tube towards ovule a. Gravitropic movement 2. Growth of shoot system b. Phototropic movement 3. Growth of root system c. Growth-irrelevant movement 4. Growth towards water d. Hydrotropic movement

1.-b. Chemotropism is known as growth or movement of a complete plant or plant parts towards the chemical stimulus. For example the growth of pollen tube down to the ovule in the ovary through the stigma and style during fertilization in order to respond to the presence of sugars in the style. 2.-c. Phototropism is the movement of a plant part in response to light. Shoots usually move towards the light, therefore are positively phototropic, whereas roots usually move away from the light, therefore are negatively phototropic. 3.-a. Gravitropism is the movement or growth of plants in response to gravity. Roots always grow down even though there's no soil for them to grow in. That's positive gravitropic, whereas stem are negatively geotropic. 4.-e. One of the lesser-known tropisms is hydrotropism, directed growth in response to water or moisture gradients. The process of hydrotropism is started by the root cap sensing water and sending a signal to the elongating part of the root. 'A' 'B' 1. Growth if pollen tube towards ovule b. Chemotropic movement 2. Growth of shoot system c. Phototropic movement 3. Growth of root system a. Gravitropic movement 4. Growth towards water e. Hydrotropic movement

The movement of a plant part in response to the stimulus of light is called phototropism. The movement towards the light is called positive phototropism and movement away from light is called negative phototropism. Plant shoots are positively phototropic and the roots are negatively phototropic.

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Tendrils and twining plants show positive (phototropism/thigmotropism).

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Important Questions on Control and Co-ordination in Living Beings

EASY

Science>Biology>Control and Co-ordination in Living Beings>Co-ordination in Plants

Name the hormone except for auxin and cytokinins, which is capable of inducing parthenocarpy.

EASY

Science>Biology>Control and Co-ordination in Living Beings>Co-ordination in Plants

What is apical dominance? Which hormone shows antagonistic effects of apical dominance?

MEDIUM

Science>Biology>Control and Co-ordination in Living Beings>Co-ordination in Plants

Define tropism. Explain four kinds of tropism with one example of each.

EASY

Science>Biology>Control and Co-ordination in Living Beings>Co-ordination in Plants

Which one of the following is a natural growth inhibitor?

EASY

Science>Biology>Control and Co-ordination in Living Beings>Co-ordination in Plants

What are the types of phytohormones? Mention their names.

MEDIUM

Science>Biology>Control and Co-ordination in Living Beings>Co-ordination in Plants

Describe different types of plant movements with suitable examples.

MEDIUM

Science>Biology>Control and Co-ordination in Living Beings>Co-ordination in Plants

Match the pairs and explain.

'A'	'B'
1. Growth of pollen tube towards ovule	a. Gravitropic movement
2. Growth of shoot system	b. Phototropic movement
3. Growth of root system	c. Growth-irrelevant movement
4. Growth towards water	d. Hydrotropic movement