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Test: Photoperiodism (Old NCERT) - NEET MCQ


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10 Questions MCQ Test Biology Class 11 - Test: Photoperiodism (Old NCERT)

Test: Photoperiodism (Old NCERT) for NEET 2024 is part of Biology Class 11 preparation. The Test: Photoperiodism (Old NCERT) questions and answers have been prepared according to the NEET exam syllabus.The Test: Photoperiodism (Old NCERT) MCQs are made for NEET 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Photoperiodism (Old NCERT) below.
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Test: Photoperiodism (Old NCERT) - Question 1

The plant which requires an exposure to light for a period greater than critical day length is

Detailed Solution for Test: Photoperiodism (Old NCERT) - Question 1

The effect of photoperiods or daily duration of light hours (and dark periods) on the growth and development of plants, especially flowering, is called photoperiodism. Photoperiodism was first studied by Gamer and Allard (1920) in 'Maryland mammoth' a variety of Tobacco.
Long Day Plants (LDPs) flower when they receive long photoperiods or light hours which are above a critical length, e.g., henbane (Hyoscyamus Nget), wheat oat sugar beet, spinach (Spinacia oleracea), radish, barley, larkspur, lettuce.

Test: Photoperiodism (Old NCERT) - Question 2

Which of the following is correct about phytochrome?

Detailed Solution for Test: Photoperiodism (Old NCERT) - Question 2

Phytochrome is a bright blue or bluish green pigment which was first of all isolated from plasma membrane of alga Mougeotias. Phytochrome is a photo receptor pigment that controls flowering. It exists in two interconvertible  forms: Pfr  or P730 (absorbs far red light) and Pr or P660 (absorbs red light).
By absorbing red light, Pr is converted into Pfr repidly. Pfr on absorbing far-red light is converted into Pr rapidly. Pfr  is physiologically active form: P is inactive.

Test: Photoperiodism (Old NCERT) - Question 3

Photoperiod stimulus is perceived by___pigmen

Detailed Solution for Test: Photoperiodism (Old NCERT) - Question 3

Experimental evidences have indicated that the photoperiodic stimulus in plants is perceived by pigment phytochrome. Phytochrome is a photoreversible pigment that absorbs light and the flowering is a phytochrome-mediated process.

Test: Photoperiodism (Old NCERT) - Question 4

The given figure shows flowering responses of three plants A, B and C to the photoperiod. Select the correct option regarding this.

Detailed Solution for Test: Photoperiodism (Old NCERT) - Question 4

Plants which flower after exposure to light above critical photoperiod are called long day plants. Plants which flower when exposed to light below critical photoperiod are called short day plant. Plants which flower after vegetative maturity are called day neutral plant.

Test: Photoperiodism (Old NCERT) - Question 5

Maryland mammoth tobacco is a short day plant. Its critical duration of darkness is 10 hours. Under which of the following conditions will it not flower?

Detailed Solution for Test: Photoperiodism (Old NCERT) - Question 5

A short day plant is the one that flowers on photoperiods shorter than the critical day length. As the critical duration of darkness in the Maryland mammoth tobacco is 10 hours i.e., it requires a minimum period of darkness of 10 hours to flower. Thus under the conditions shown in option (a), the plant will not flower.

Test: Photoperiodism (Old NCERT) - Question 6

Sedum is a long day plant. Its critical duration of light is 13 hours Under which of the following conditions would it flower?

Detailed Solution for Test: Photoperiodism (Old NCERT) - Question 6

A long day plant (LDP) is the one that flowers on photoperiods longer than critical day length. As the critical duration of light in Sedum is given to be 13 hours i.e., it required a minimum period of light of 13 hours to flower. Thus, the plant will flower only under the conditions shows in option (c).

Test: Photoperiodism (Old NCERT) - Question 7

Four potted plants (I, II, Ill, and IV) of a short day plant, which has the critical period of 14 hours; are taken and exposed to light for different time periods. The light periods given are listed in the table.

Which potted plant will show flowering after exposure to light?

Detailed Solution for Test: Photoperiodism (Old NCERT) - Question 7

A short day plant (SDP), which has a critical period of 14 hours, will flower only if it is provided a continuous period of darkness of 14 hours; which has been given to the potted plant-I only. In rest of the potted plants, more amounts of light periods are being given and thus the dark periods have been reduced to below 14 hours.

Test: Photoperiodism (Old NCERT) - Question 8

Low temperature treatment to speed up the process of flowering is referred to as

Detailed Solution for Test: Photoperiodism (Old NCERT) - Question 8

Vernalisation is the process of shortening of the juvenile or vegetative phase and hastening flowering by a previous cold treatment. In vernalization by cold treatment, winter varieties are transferred into spring or summer varieties. The site of vernalization is apical meristem or all the meristematic cells e.g., shoot tip, embryo tips, root apex etc.  The low temperature required for vernalization is usually 0o − 5oC. As a result of vernalization, a flowering hormone called vernalin is formed (reported by Melchers), but vernalin has never been isolated.

Test: Photoperiodism (Old NCERT) - Question 9

Cabbage is a biennial plant which produces flowers in the second year of growth. In an attempt to make it flower in a single year, four potted plants (I, II, III, and IV) of cabbage were subjected to different temperatures for several days given in the table.

Which potted plant will show flowering?

Detailed Solution for Test: Photoperiodism (Old NCERT) - Question 9

The low temperature required for vernalization is usually 0o − 5oC. In nature, the plants requiring vernalization are commonly biennials (e.g., cabbage, sugar canes), which complete their life cycle in two years. They germinate and grow vegetatively in the first year and produce flowers in the second year of growth. These plants fulfill their cold requirement during winters. However, such-biennial plants can be made to flower in one growing season by providing low-temperature treatment (i.e.,0o − 5oC temperature) to young plants or moistened seeds.

Test: Photoperiodism (Old NCERT) - Question 10

Vernalisation can often be replaced by

Detailed Solution for Test: Photoperiodism (Old NCERT) - Question 10

Vernalisation or low temperature treatement of some plants can be replaced by gibberellins.

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