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Test: Development and Growth Regulators (July 18) - NEET MCQ


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10 Questions MCQ Test - Test: Development and Growth Regulators (July 18)

Test: Development and Growth Regulators (July 18) for NEET 2024 is part of NEET preparation. The Test: Development and Growth Regulators (July 18) questions and answers have been prepared according to the NEET exam syllabus.The Test: Development and Growth Regulators (July 18) MCQs are made for NEET 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Development and Growth Regulators (July 18) below.
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Test: Development and Growth Regulators (July 18) - Question 1

Which is a stress hormone?

Test: Development and Growth Regulators (July 18) - Question 2

Geocarpic fruits are produced by

Detailed Solution for Test: Development and Growth Regulators (July 18) - Question 2

Geocarpy refers to the ripening of fruits underground, In the case of ground nut, the young fruits are pushed into the soil as a result of post-fertilisation curvature of the stalk.

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Test: Development and Growth Regulators (July 18) - Question 3

Ripening of fruit is controlled by

Detailed Solution for Test: Development and Growth Regulators (July 18) - Question 3

Ethylene is a gaseous hormone. It aids in ripening of climacteric fruits and dehiscence of dry fruits. Climacteric fruits are the fleshy fruits which show a sudden sharp rise of respiration rate at the time of ripening (respiratory climacteric). They are usually transported in green or unripe stage. Ethylene is used to induce artificial ripening of these fruits e.g., Apple, Mango, Banana, etc.

Test: Development and Growth Regulators (July 18) - Question 4

Coconut milk (coconut water) is widely used in tissue culture because it contains

Detailed Solution for Test: Development and Growth Regulators (July 18) - Question 4

Cytokinins are a group of hormones that promote cell division in plant roots and shoots and the growth of buds. Coconut milk is at times used in some tissue culture medium as it is rich in cytokinins.

Test: Development and Growth Regulators (July 18) - Question 5

Differentiation of the shoot is controlled by

Detailed Solution for Test: Development and Growth Regulators (July 18) - Question 5

Ratio of cytokinins to auxins controls differentiation. If both of these are present in equal quantities, the cells divide but fail to differentiate. If there is more cytokinin than auxin, shoot buds develop. If there is more auxin than cytokinin, roots develop.

Test: Development and Growth Regulators (July 18) - Question 6

The hormone responsible for apical dominance is

Test: Development and Growth Regulators (July 18) - Question 7

Which method out of the following renders the seed coat permeable to water so that embryo expansion is not physically retarded?

Detailed Solution for Test: Development and Growth Regulators (July 18) - Question 7

Scarification involves weakening, opening otherwise altering the coat of a seed to germination. Scarificationis often done mechanically, thermally, and chemically. The seeds of many plant species are often impervious to water and gases, thus preventing or delaying germination.

Test: Development and Growth Regulators (July 18) - Question 8

A hormone delaying senescence is

Detailed Solution for Test: Development and Growth Regulators (July 18) - Question 8

The hormones that delay senescence must decrease while the ones that speed up the aging process must increase. Cytokinins are one group of senescence delayers. These hormones are involved in cell growth, and high levels can help prevent senescence.

Test: Development and Growth Regulators (July 18) - Question 9

Gibberellin was discovered from

Detailed Solution for Test: Development and Growth Regulators (July 18) - Question 9
Gibberelin was 1st discovered in japan by kurusowa.He observed from his field that some of rice seedlings had grown much taller than others. on further observations he found that such taller rice plants had shown unusual internodal elongation.The internal elongation is known as bakane or foolish seedling disease of rice.Later it was discovered that elongation was due to a action of substance produced by fungusGibberella fujikuroi.The substance was successfully isolated from the fungus and it was named as gibberelic acid.
Test: Development and Growth Regulators (July 18) - Question 10

‘Foolish seedling’ disease of rice led to the discovery of

Detailed Solution for Test: Development and Growth Regulators (July 18) - Question 10

‘Foolish seedling’ of rice led to the discovery of GA.

Foolish seedling disease or Bakanae disease is a disease of rice seedlings, which was caused by a fungal pathogen . Kurosawa reported the appearance of symptoms of the disease in uninfected rice seedlings when they were treated with sterile filtrates of the fungus. The active substances were later identified as Gibberellic acid.

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