Question 1

Which of the following instrument can be used to record plant growth by seconds Le. in fraction of a minute?

Accepted Answer

Correct answer is D

Question 2

Which two factors primarlly affect the developmental phase of growth of plants?

Accepted Answer

Differential length of light and temperature influence the developmental phase of plant. Photoperiodism and vernalization are the two important factors responsible for the flowering of plants.

Question 3

Evergreen trees remain green throughout the year on account of:

Accepted Answer

Correct answer is B

Question 4

The growth involues:

Accepted Answer

First phase of growth is cell division, second phase is cell enlargement and third phase is cell maturation. present.

Question 5

Where would you look for active cell division in plants?

Accepted Answer

Correct answer is D

Question 6

Plant growth in length is increased by:

Accepted Answer

Apical meristem are found at shoot and root apex. As a result of activity of these meristems plants increases in length.

Question 7

Growth is:

Accepted Answer

Because growth is a irreversible process.

Question 8

Phytotron is a device by which:

Accepted Answer

In glass houses when plants are kept on artificial light and temperature, then this method is called phytotron and is applicable in agriculture, horticulture and tissue culture.

Question 9

The S-shaped growth curve and 'grand period of growth" may change with:

Accepted Answer

Correct answer is D

Question 10

See the figure and choose the correct option from table.

Accepted Answer

Correct answer is B

Question 11

Deeply sown seeds do not germinate and do not come up over due to the deficiency of:

Accepted Answer

Most plants require oxygen for seed germination. That is why soil is ploughed before sowing the seeds.

Question 12

Among plants 'pheromones' are secreted by the cells of following plants for the given function:

Accepted Answer

Correct answer is D

Question 13

The natural plart hannanes were flrst isclated from:

Accepted Answer

Human urine and tice sesdlings

Question 14

Who used the term 'phytohormones' for plant hormone?

Accepted Answer

Growth hormones are also called phytohormomes term given by Thimann (1948).

Question 15

Phytohormones control:

Accepted Answer

Correct answer is B

Question 16

Legume seeds exhlbit dermancy because of:

Accepted Answer

Seed of many plants including the leguminosae, Malvaceae. Chenopodiaceae, Convolvulaceae and Solanceae have very hard seed coats. Such seed coats are impermeable to water.

Question 17

Iy hoemore applicatien in is posslble to obesin scedless frults. In which of the folowing it is undesirable to cbtaln ceediess frurs?

Accepted Answer

By parthenogenesis, seedless fruits are produced but in pomegranate, this process is inapplicable because in it seeds are important.

Question 18

In which of the following respect, the plant hormones differ from enzymes?

Accepted Answer

Growth of the plant is very much regulated by certain chemical substances (hormones), which are synthesized by the plant in very small quantities. They are needed in small quantities at very low concentrations as compared to enzyme.

Question 19

Plant hanzones see urualy:

Accepted Answer

Correct answer is D

Question 20

Whose belnigue is employed for the extraction ard elimination of homenes?

Accepted Answer

Correct answer is C

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Solution for Class 11, Biology, Plant Growth and Development

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