11th Standard Syllabus & Materials

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11th Botany - Mineral Nutrition Book Back Questions

Published on: 12/09/2019

Botany - Mineral Nutrition

Download Tamil Nadu 11th Standard Biology question papers, model tests, one-mark questions, important questions, and public exam papers in PDF format. Free study materials and answer keys for TN State Board students.

Questions + Answers key

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Std: 11th Standard - Biology

chapter: - Model Question paper

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Questions:

Multiple Choice Question

2 x 1 = 2

Identify the correct statement
i. Sulphur is essential for amino acids Cystine and Methionine
ii. Low level of N, K, S and Mo affect the cell division
iii. Non-leguminous plant Alnus which contain bacterium Frankia
iv. Denitrification carried out by nitrosomonas and nitrobacter.

(a)

I, II are correct

(b)

I, II, III are correct

(c)

I only correct

(d)

all are correct

The element which is not remobilized?

(a)

Phosphorous

(b)

Potassium

(c)

Calcium

(d)

Nitrogen

Generic 2

1 x 2 = 2

The nitrogen is present in the atmosphere in huge amount but higher plants fail to utilize it. Why?

Generic 3

1 x 3 = 3

Write the role of nitrogenase enzyme in nitrogen fixation?

Generic 5

1 x 5 = 5

Explain the insectivorous mode of nutrition in angiosperms?

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Answers Key:

Multiple Choice Question

2 x 1 = 2

(b)
I, II, III are correct

Generic 2

1 x 2 = 2

(i) Yes. Nitrogen cannot be directly absorbed by plants but they are essential for normal growth and functioning of a plant. Hence they are fixed by bacteria and some fungi.
(ii) It can be utilised only in the form of nitrates (NO₃^-) and nitrites (NO₂^-).

Generic 3

1 x 3 = 3

(i) Nitrogen fixation process requires Nitrogenase enzyme complex, Minerals (Mo, Fe and S), anaerobic condition, ATP, electron and glucose 6 phosphate as H⁺ donor.
(ii) Nitrogenase enzyme is active only in anaerobic condition.
(iii) To create this anaerobic condition a pigment known as leghaemoglobin is synthesized in the nodules which acts as oxygen scavenger and removes the oxygen.

Generic 5

1 x 5 = 5

Plants which are growing in nitrogen deficient areas develop insectivorous habit to resolve nitrogen deficiency.
a. Nepenthes (Pitcher plant): Pitcher is a modified leaf and contains digestive enzymes. Rim of the pitcher is provided with nectar glands and acts as an attractive lid. When insect is trapped, proteolytic enzymes will digest the insect.
b. Drosera (Sundew): It consists of long club shaped leaves with tentacles which secrete sticky digestive fluid which looks like a sundew and attracts insects.
c. Utricularia (Bladder wort): Submerged plant in which leaf is modified into a bladder to collect insect in water.
d. Dionaea (Venus fly trap): Leaf of this plant modified into a colourful trap. Two folds of lamina consist of sensitive trigger hairs and when insects touch the hairs it will close and traps the insects.