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Test: Chemical Coordination In Plants - UPSC MCQ


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10 Questions MCQ Test - Test: Chemical Coordination In Plants

Test: Chemical Coordination In Plants for UPSC 2024 is part of UPSC preparation. The Test: Chemical Coordination In Plants questions and answers have been prepared according to the UPSC exam syllabus.The Test: Chemical Coordination In Plants MCQs are made for UPSC 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Chemical Coordination In Plants below.
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Test: Chemical Coordination In Plants - Question 1
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How do plant cells achieve shape changes necessary for movement?

Detailed Solution for Test: Chemical Coordination In Plants - Question 1
Plant cells achieve shape changes required for movement by adjusting their water content. This adjustment leads to swelling or shrinking of the cells, resulting in altered shapes that enable movements like leaf folding or bending towards light. Water regulation is essential for maintaining cell turgidity and supporting various plant movements.
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In plants, what is the main mechanism used for communication between cells to convey information about touch?

Detailed Solution for Test: Chemical Coordination In Plants - Question 2
Unlike animals, plants use electrical-chemical signals to communicate information between cells regarding touch or stimuli. This method of communication plays a vital role in coordinating movements in response to external stimuli, such as touch or light. These signals help plants trigger specific responses without the presence of a nervous system.
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Test: Chemical Coordination In Plants - Question 3
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What distinguishes the movement in a sensitive plant from the movement in a seedling?

Detailed Solution for Test: Chemical Coordination In Plants - Question 3
The key distinction between the movement in a sensitive plant and a seedling is that the movement in the sensitive plant is not related to growth, whereas the movement in a seedling depends on its growth. This difference highlights how plants exhibit two types of movements: those tied to growth, like tropic movements, and those not linked to growth, such as immediate responses to stimuli like touch.
Test: Chemical Coordination In Plants - Question 4
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Which plant hormone is synthesized at the shoot tip, aids in cell elongation, and is involved in phototropism?
Detailed Solution for Test: Chemical Coordination In Plants - Question 4
Auxin is the plant hormone that is synthesized at the shoot tip and is responsible for promoting cell elongation. It plays a vital role in phototropism, which is the plant's growth response toward light. Auxin helps regulate various aspects of plant growth and development by controlling cell division, differentiation, and elongation.
Test: Chemical Coordination In Plants - Question 5
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What type of movement in plants is related to growth and can be either towards or away from stimuli?
Detailed Solution for Test: Chemical Coordination In Plants - Question 5
Tropic movements in plants are related to growth and can be either towards or away from stimuli. These movements are crucial for plant orientation and survival as they help plants respond to environmental cues such as light and gravity. For example, positive phototropism involves plants bending towards light, while negative geotropism involves growth away from the earth.
Test: Chemical Coordination In Plants - Question 6
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What type of plant movement is characterized by an immediate response to the stimulus and involves the use of electrical-chemical means for cell-to-cell communication?
Detailed Solution for Test: Chemical Coordination In Plants - Question 6
Independent growth in plants is marked by an immediate response to stimuli and involves the use of electrical-chemical means for conveying information from cell to cell. When a plant undergoes this kind of movement, cells adjust their shape by altering the water content within them, leading to either swelling or shrinking. An example of this type of movement is the drooping of leaves in a "Touch-me-not" plant when it is touched.
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What is the primary function of Gibberellin in plants?
Detailed Solution for Test: Chemical Coordination In Plants - Question 7
Gibberellin primarily functions in plants by stimulating stem growth. This plant hormone is responsible for elongation of stems and leaves, helping the plant to grow taller. It also plays a key role in various developmental processes such as seed germination and flowering. Gibberellins are essential for regulating plant growth in response to environmental cues.
Test: Chemical Coordination In Plants - Question 8
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What type of movement in plants involves growth responses towards or away from gravity?
Detailed Solution for Test: Chemical Coordination In Plants - Question 8
Geotropism, also known as gravitropism, is the plant's growth response either towards or away from the gravitational force. This movement helps plants orient themselves properly with respect to the Earth's gravitational field. For instance, roots typically exhibit positive geotropism by growing towards gravity, anchoring the plant and aiding in water and nutrient absorption, while shoots often display negative geotropism by growing away from gravity, towards the light for photosynthesis.
Test: Chemical Coordination In Plants - Question 9
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Match the following-
Detailed Solution for Test: Chemical Coordination In Plants - Question 9

Hormones synthesized at places away from where they act. Growth is seedling germination. Chemotropic is the growth of pollen tubes towards ovules. Root is positively geotrophic. Shoot is positively phototropic.

Test: Chemical Coordination In Plants - Question 10
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Mark the odd one out:
Detailed Solution for Test: Chemical Coordination In Plants - Question 10

Auxin, cytokinin and gibberellins are growth promoting plant hormones while Abscisic acid is the growth inhibitior plant hormone.

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