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Assertion & Reason Test: Plant Growth & Development


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10 Questions MCQ Test Biology Class 11 | Assertion & Reason Test: Plant Growth & Development

Assertion & Reason Test: Plant Growth & Development for NEET 2022 is part of Biology Class 11 preparation. The Assertion & Reason Test: Plant Growth & Development questions and answers have been prepared according to the NEET exam syllabus.The Assertion & Reason Test: Plant Growth & Development MCQs are made for NEET 2022 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Assertion & Reason Test: Plant Growth & Development below.
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Assertion & Reason Test: Plant Growth & Development - Question 1

A: If a plant is kept horizontally, auxin accumulates on a lower surface.

R: Displacement of statoliths and other cell organelles to lower surface modifies the translocation pattern of auxin.

Detailed Solution for Assertion & Reason Test: Plant Growth & Development - Question 1

At the tip of each root, some cells contain membrane-bound starch grain called statoliths → Gravity sensors in plants.

Assertion & Reason Test: Plant Growth & Development - Question 2

A: Only buds or embryos can be vernalized.

R: Vernalization requires dividing cells.

Detailed Solution for Assertion & Reason Test: Plant Growth & Development - Question 2 Bud, embryos have dividing cells.

Assertion & Reason Test: Plant Growth & Development - Question 3

A: Phytochrome, a protein, has a regulatory function.

R: Various morphogenetic processes are regulated by it.

Detailed Solution for Assertion & Reason Test: Plant Growth & Development - Question 3 Phytochrome is a protein, regulates flowering in a short day and long-day plants.

Assertion & Reason Test: Plant Growth & Development - Question 4

A: Auxins treatment causes acidification of cell wall and helps in cell elongation.

R: Loosening of cell wall microfibrils occurs.

Detailed Solution for Assertion & Reason Test: Plant Growth & Development - Question 4

Assertion & Reason Test: Plant Growth & Development - Question 5

A: Cytokinins are anti-ageing hormones.

R: They cause changes in osmotic potential by increasing the volume of mature cells.

Detailed Solution for Assertion & Reason Test: Plant Growth & Development - Question 5 Cytokinins delay the senescence, i.e. anti ageing hormone and increase the mobilisation of elements.

Assertion & Reason Test: Plant Growth & Development - Question 6

A: Gibberellic acid increases the yield of malt from barley grain.

R: Gibberellins stimulate the synthesis of amylase, protease and other hydrolytic enzymes for mobilisation of reserve food.

Detailed Solution for Assertion & Reason Test: Plant Growth & Development - Question 6

Assertion & Reason Test: Plant Growth & Development - Question 7

A: 2, 4-D is widely used by farmers in agricultural and horticultural practices.

R: Flowering in most plants can be initiated by using high concentration of Auxin.

Detailed Solution for Assertion & Reason Test: Plant Growth & Development - Question 7

2, 4D → to remove weeds.

Florigen → flowers

Assertion & Reason Test: Plant Growth & Development - Question 8

A: Cytokinin, along with the auxin, is required for morphogenesis.

R: More cytokinin to auxin ratio promote root initiation during micropropagation.

Detailed Solution for Assertion & Reason Test: Plant Growth & Development - Question 8

Assertion & Reason Test: Plant Growth & Development - Question 9

A: Seeds do not sprout when Gibberellins overcome ABA.

R: GA inhibits protein and RNA synthesis.

Detailed Solution for Assertion & Reason Test: Plant Growth & Development - Question 9 Seeds/buds sprout only when gibberellins overcome ABA. ABA inhibits protein and RNA synthesis.

Assertion & Reason Test: Plant Growth & Development - Question 10

A: Soyabean and sugar beet flower when exposed to a photoperiod shorter than a critical period.

R: Most winter flowering plants are LDP.

Detailed Solution for Assertion & Reason Test: Plant Growth & Development - Question 10

Soyabean → Short day plant.

Sugarbeet – Long day plant.

Winter flowers – SDP.

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