• Nutrition in Plants and Animals - 1
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Nutrition in Plants and Animals - 1

Description: Nutrition in Plants and Animals - 1
Number of Questions: 20
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Tags: Nutrition in Plants and Animals - 1 Nutrition in Plants Classification of Plants Nutrition in Animals
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Which of the following is the most abundant element found in plants?

  1. Carbon

  2. Nitrogen

  3. Iron

  4. Manganese

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Correct Option: A

Among the following plant nutrients, which is a macro-nutrient?

  1. Manganese

  2. Calcium

  3. Chlorine

  4. Copper

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Correct Option: B

Which of the following are the most abundant elements in the living cells?

  1. C, H, S and P

  2. C, O, N and P

  3. C, H, O and N

  4. C, H, Mg and Ca

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Correct Option: C

Which of the following is a macronutrient?

  1. Ca

  2. Mo

  3. Mn

  4. Zn

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Correct Option: A

Which of the following is the largest reservoir of nitrogen?

  1. Rocks

  2. Sea

  3. Air

  4. Soil

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Correct Option: C

Which of the following is not an essential micronutrient?

  1. Boron

  2. Nickle

  3. Manganese

  4. Molybdenum

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Correct Option: B

Grana are absent in the chloroplast of

  1. shrubs

  2. herbs

  3. algae

  4. trees

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Correct Option: C

Which of the following elements is useful in seed germination?

  1. Iron

  2. Magnesium

  3. Boron

  4. Zinc

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Correct Option: C

Which of the following is required by plants for the active uptake of minerals?

  1. Respiration

  2. Expenditure of energy

  3. Root metabolism

  4. Photophosphorylation

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Correct Option: B

Which of the following functions is performed by the microelements in plants?

  1. Cofactors of enzymes

  2. Building blocks of amino acids

  3. Constituent of hormones

  4. Binder of cell structure

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Correct Option: A

Deficiency of which element causes premature leaf fall in plants?

  1. Potassium

  2. Sodium

  3. Phosphorus

  4. Zinc

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Correct Option: C
Explanation:

When phosphorus is deficient, growth is reduced and leaves fall off prematurely. Plants lacking phosphorus produce dull, bluish-green leaves that turn a purplish or bronze colour with brown edges.

Which of the following enzymes is required for nitrogen fixation?

  1. Nitrogen deaminase

  2. Nitrodioxidase

  3. Amino acid decarboxylase

  4. Nitrogenase

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Correct Option: D

In which of the following processes are minerals absorbed?

  1. Adsorption

  2. Diffusion

  3. Active transport

  4. Osmosis

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Correct Option: C

Which of the following is a nitrogen fixing bacterium?

  1. Rhozobium

  2. Acetobacter

  3. Mycoplasma

  4. Chlamydia

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Correct Option: A

Which of the following ions controls the stomatal movement in plants?

  1. Na+

  2. Ca2+

  3. Mg2+

  4. K+

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Correct Option: D
Explanation:

K+  ions controls the stomatal movement in plants

What do you call the process of conversion of ammonia to nitrite by microbes?

  1. Nitrification

  2. Nitrogen fixation

  3. Eutrophication

  4. Denitrification

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Correct Option: A

Which of the following is a nitrogen fixing bacterium present in legume roots?

  1. Azotobacter

  2. Rhizobium

  3. Nitrobacter

  4. Nitrosomonas

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Correct Option: B
Explanation:

Rhizobia is “the group of soil bacteria that infect the roots of legumes to form root nodules”. Rhizobia are found in the soil and after infection, they produce nodules in the legume where they fix nitrogen gas (N2) from the atmosphere, turning it into a more readily useful form of nitrogen (N). From here, the nitrogen is exported from the nodules and used for growth in the legume. Once the legume dies, the nodule breaks down and releases the rhizobia back into the soil where they can live individually or reinfect a new legume host.

Which of the following plants can fix nitrogen from air?

  1. Rice

  2. Wheat

  3. Pea

  4. Maize

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Correct Option: C
Explanation:

Pea plant can fix nitrogen from air.

Which of the following elements is essential for root growth?

  1. Zn

  2. Ca

  3. Mo

  4. S

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Correct Option: B
Explanation:

Calcium, a vital component in cell walls of plants, is essential for root growth.

Which of the following is the function of Mg in plants?

  1. Energy transfer

  2. Stomatal opening

  3. Synthesis of chlorophyll

  4. Translocation of carbohydrates

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Correct Option: C
Explanation:

Magnesium has an important role in photosynthesis because it forms the central atom of chlorophyll.

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