Leghaemoglobin is produced in response to from Biology Mineral N

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 Multiple Choice QuestionsMultiple Choice Questions

41.

Which of the following element plays an important role in nitrogen fixation

  • Zinc

  • Molybdenum

  • Manganese

  • Copper


42.

Which one of the following elements is almost non-essential for plants?

  • Ca

  • Mo

  • Zn

  • Na


43.

Which of the following genera is associated with coralloid roots?

  • Cycas

  • Taxus

  • Pinus

  • Sequoia


44.

Which of the following is a group of micronutrients for plants?

  • Fe, Mn, Cu, Mo, Zn

  • Fe, Mn, Cu, O, C

  • Cu, B, Cl, Fe, Ca

  • Ca, Mg, Fe


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45.

Assertion: Nitrogen is one of the most essential elements of human body.

Reason: All types of prokaryotic organisms are able to fix nitrogen.

  • If both assertion and reason are true and reason is the correct explanation of assertion. 

  • If both assertion and reason are true but reason is not the correct explanation of assertion. 

  • If assertion is true but reason is false. 

  • If both assertion and reason are false.


46.

Assertion: Soil particles, particularly clay and organic matter in soil, contain negative charges that attract positively-charged ions such as Ca2+, K+ and Mg2+.

Reason: Essential elements derived from soil are termed as mineral elements while those derived from air or water are known as nonmineral elements.

  • If both assertion and reason are true and reason is the correct explanation of assertion. 

  • If both assertion and reason are true but reason is not the correct explanation of assertion. 

  • If assertion is true but reason is false. 

  • If both assertion and reason are false.


47.

Assertion : Atmospheric nitrogen gas is always fixed by nitrogen-fixing micro-organisms.

Reason : Decomposers release nitrogen gas from dead bodies of plants and animals.

  • If both assertion and reason are true and reason is the correct explanation of assertion

  • If both assertion and reason are true but reason is not the correct explanation of assertion

  • If assertion is true but reason is false

  • If both assertion and reason are false


48.

Apiculture is associated with which of the following groups of plants

  • Grapes, maize, potato

  • Sugarcane, paddy, banana

  • Guava, sunflower, strawberry

  • Pineapple, sugarcane, strawberry


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49.

Leghaemoglobin is produced in response to

  • respiration

  • photosynthesis

  • fatty acid synthesis

  • N2 fixation


D.

N2 fixation

Bacteria like Rhizobium and Frankia live free as aerobes in the soil but are unable to fix nitrogen. They develop the ability to fix nitrogen only as a symbiont when they become anaerobic. They are unable to fix nitrogen by themselves. Roots of a legume secrete chemical attractants. Bacteria collect over the root hairs and form an infection thread enclosing the bacteria. Infection thread grows along with multiplication of bacteria. Bacteria stop dividing and form irregular polyhedral structures called bacteroids. In an infected cell, bacteroids occur in groups surrounded by host membrane. The host cell develops a pinkish pigment called leghaemoglobin (Lb). It is oxygen scavenger and is related to blood pigment haemoglobin. It protects nitrogen fixing enzyme nitrogenase from oxygen.


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50.

Assertion : Cattles feed on leaves of maize to get nutrition for growth and development.

Reason: A number of symbiotic bacteria are present in rumen of cattle.

  • If both assertion and reason are true and reason is the correct explanation of assertion.

  • If both assertion and reason are hue but reason is not the correct explanation of assertion.

  • If assertion is true but reason is false.

  • If both assertion and reason are false.


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