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CBSE 11th Standard Biology Subject Plant Growth and Development Ncert Exemplar 2 Marks Questions 2021

Published on: 28/05/2021

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Std: 11th Standard CBSE - Biology

chapter: - NCERT Exemplers

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Questions:

Generic 2

5 x 2 = 10

Plant Growth Substances have practical applications. Name the PGS we should use
a) To increase yield of sugarcane.
b) Promote the lateral shoot growth
c) Cause sprouting of potato tuber
d) Inhibit seed germination

Some varieties of wheat are known as spring wheat, while others are called winter wheat. The former variety is sown and planted in spring and is harvested by the end of the same season. However,latter one if planted in spring, fails to flower or produce mature grains within a span of a flowering season. Explain Why?

Light plays an important role in the life of all organisms. Name any three physiological processes in plants which are affected by light.

The rice seedlings infected with fungus Gibberella fujikuroi is called foolish seedlings ? What was the reason behind it?

A primary root grows from 5-19 cm in a week. Calculate the absolute growth rate and relative growth rate over the period.

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Answers Key:

Generic 2

5 x 2 = 10

(i) Gibberellin.
(ü) Cytokinins.
(iüi)Gibberellin
(iv) Abscisic acid.

Winter varieties require an exposure to very cold temperature, a phenomenon, known as vernalisation; in the absence of this, plants do not flower to produce grains. So, they are sown in autumn; they germinate and remain as seedlings during winter.
They resume growth in spring and reproduce by the end of the season; they are harvested in the mid-summer.

(i) Photoperiodism
(ii) Phototropism
(iii) Photosynthesis

The rice seedlings infected with fungus Gibberella fujikuroi is called foolish seedlings because these seedlings grow foolishly. i.e. there is abnormal increase in internodal area of rice and ultimately.so tall that they ultimately, fall on ground and result into death of plants.

Absolute growth rate \(=\frac { (19-5) }{ 7 } =2cm/day\)
Relative growth rate \(=\frac { (19-5) }{ 7*5 } =0.4cm/day\)