Solutions-Class-12-Biology-Chapter-7-Plant Growth and Mineral Nutrition-Maharashtra Board

Plant Growth and Mineral Nutrition

Maharashtra Board-Class-12th-Biology-Chapter-7

Solutions

Question 1. Multiple choice questions.

(1) Which of the hormones can replace vernalization?

(a) Auxin

(b)  Cytokinin

(c)  Gibberellins

(d)  Ethylene

Answer :

(2) The principle pathway of water translocation in angiosperms is ..........

(a) Sieve cells

(b) Sieve tube elements

(c) Xylem

(d) Xylem and phloem

Answer :

(3) Abscisic acid controls ..................

(a) cell division

(b) leaf fall and dormancy

(c) shoot elongation

(d) cell elongation and wall formation

Answer :

(4) Which is employed for artificial ripening of banana fruits?

(a) Auxin

(b) Ethylene

(c) Cytokinin

(d) Gibberellin

Answer :

(5) Which of the following is required for stimulation of flowering in the plants?

(a) Adequate oxygen

(b) Definite photoperiod

(c) Adequate water

(d) Water and minerals

Answer :

(6) For short day plants, the critical period is .................

(a) light

(b) dark/night

(c) uv rays

(d) both a and c

Answer :

(7) Which of the following is day neutral plant?

(a) Tomato

(b) Cotton

(c) Sunflower

(d) Soybean

Answer :

(8) Essential macroelements are ............

(a) manufactured during photosynthesis

(b) produced by enzymes

(c) absorbed from soil

(d) produced by growth hormones

Answer :

(9) Function of Zinc is ................

(a) closing of stomata

(b) biosynthesis of 3-IAA

(c) synthesis of chlorophyll

(d) oxidation of carbohydrates

Answer :

(10) Necrosis means ...............

(a) yellow spots on the leaves

(b) death of tissue

(c) darkening of green colour in leaves

(d) wilting of leaves

Answer :

(11) Conversion of nitrates to nitrogen is called .....................

(a) ammonification

(b) nitrification

(c) nitrogen fixation

(d) denitrification

Answer :

(12) How many molecules of ATP are required to fix one molecule of nitrogen?

(a) 12

(b) 20

(c) 6

(d) 16

Answer :

Question 2. Very Short Answer Questions :

(1) Enlist the phases of growth in plants?

Answer :

(2) Give the full form of IAA?

Answer :

(3) What does it mean by ‘open growth’?

Answer :

(4) Which is the plant stress hormone?

Answer :

(5) What is denitrification?

Answer :

(6) Name the bacteria responsible for conversion of nitrite to nitrate.

Answer :

(7) What is role of gibberellin in rosette plants?

Answer :

(8) Define vernalization.

Answer :

(9) Define photoperiodism.

Answer :

(10) What is grand period of growth?

Answer :

Question 3. Short Answer Questions :

(1) Write a short note on :

(a) Differentiation

Answer :

(b) Redifferentiation

Answer :

(2) Differentiate between Arithmetic and Geometric growth.

Answer :

(3) Enlist the role and deficiency symptoms of : a. Nitrogen b. Phosphorus c. Potassium

Answer :

(4) What is short day plant? Give any two examples.

Answer :

(5) What is vernalization? Give its significance.

Answer :

Question 4. Long Answer Questions :

(1) Explain sigmoid growth curve with the help of diagram.

Answer :

(2) Describe the types of plants on the basis of photoperiod required, with the help of suitable examples.

Answer :

(3) Explain biological nitrogen fixation with example.

Answer :

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