Lakshya Education MCQs

Question: Match the following and choose the correct combination from the options given:

ListIListIIa. Photolysis of water1. Zincb. Diazotrophy2. Copperc. Cytochrome c oxidase3. Manganesed. Biosynthesis of IAA4. Molybdenum5.Boron
Options:
A.a – 3, b – 2, c – 1, d – 5
B.a – 3, b – 4, c – 2, d – 1
C.a – 5, b – 2, c – 3, d – 4
D.a – 4, b – 1, c – 3, d – 2
Answer: Option B
: B

Manganese is involved in the breaking down the water molecule during photosynthesis.
Diazotrophy is the ability to fix atmospheric nitrogen into a biologically useful form. This is done with the help of the nitrogenase enzyme, which requires an iron-molybdenum cofactor.
Cytochrome c oxidase contains a copper center consisting of 2 copper atoms.
Zinc is required for the synthesis of auxins. Indole 3 acetic acid (IAA) is a prominentauxin.

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More Questions on This Topic :

Question 1. Assertion (A): Sulphur helps in stabilizing the protein structure.

Reason (R): Sulphur bridges are formed between sulphur containing amino acids of proteins.
  1.    Both A & R are true and R explains A
  2.    Both A & R are true and R does not explain A
  3.    A is true and R is false
  4.    Both A & R are false
Answer: Option A
: A

Sulphur forms disulphide bridges between sulphur containing amino acids and stabilizes protein structure.
Question 2. Identify the correct statements related to soil

A. Soil acts as a matrix and stabilizes the plant

B. Soil is the source for both inorganic and organic solutes

C. Soil holds water and supplies air to the roots

D. Soil acts as a reservoir of gasses
  1.    A & C
  2.    B & C
  3.    C & D
  4.    A, B, C and D
Answer: Option A
: A

The plant is fixed in the soil with the root system. The soil holds water and supplies air to roots. The soil is the reservoir of water and minerals. Soil also harbors nitrogen-fixing bacteria and other microbes which supply atmospheric nitrogen in utilizable organic form to plants.
Question 3. Identify the correct option related to the given figure regarding root nodule formation in legumes.

  1.    A - Inner cortical and pericycle cells under division B - Infection thread containing bacteria
  2.    A - Infection thread containing bacteria B - Inner cortical and pericycle cells under division
  3.    A - Mesophyll cells  B - Infection thread containing bacteria
  4.    A - Root hair B - Mature nodule
Answer: Option B
: B

Rhizobia infects the root hair and forms infection thread. It causes inner cortical cells and pericycle cells to divide rapidly.
Question 4. Elements that have no role to play in plants have not been found to be present in plants.
  1.    True
  2.    False
  3.    Iron
  4.    Manganese
Answer: Option B
: B

Soil is a great reservoir for many minerals on this planet. Because of the mode of absorption of minerals in plants, most of the minerals in soil can enter the plants through their roots. Even though they might not have any role to play in the plant. Thus elements that have no role to play in plants have been found to be present in plants.
Question 5. Match the following columns related to nitrogen cycle

Column - I Column - IIA. Nitrogen fixation1.Conversion of NH3 toNO3B. Nitrogen assimilation2.Conversion of NO3 or NH3 to organic nitrogenC. Ammonification3.Conversion of NO3 to atmospheric nitrogenD. Nitrification4.Conversion of N2 to NO3 or NH3E. Denitrification5.Conversion of organic nitrogen to NH3
  1.    A - 1, B - 2, C - 3, D - 4, E - 5
  2.    A - 4, B - 2, C - 5, D - 1, E - 3
  3.    A - 5, B - 4, C - 3, D - 2, E - 1
  4.    A - 4, B - 2, C - 5, D - 3, E - 1
Answer: Option B
: B

Nitrogen cycle involves five steps- nitrogen fixation, nitrogen assimilation, ammonification, nitrification and denitrification. The product of one step is the substrate for the next step.

Column - IColumn - IIA. Nitrogen fixation4.Conversion ofN2toNO3orNH3B. Nitrogen assimilation2.Conversion ofNO3orNH3to organic nitrogenC. Ammonification5.Conversion of organic nitrogen toNH3D. Nitrification1.Conversion ofNH3toNO3E. Denitrification3.Conversion ofNO3to atmospheric nitrogen
Question 6. In nitrogen fixation, nitrogen is converted into
  1.    NO2, NO or N2
  2.    NO2, NO−3 or NH3
  3.    N2, NH3 or NH+4
  4.    N2, Amino acids or NH+4
Answer: Option B
: B

In nitrogen fixation molecular nitrogen is converted into nitrogen oxides like NO2, NO3through physical nitrogen fixation process or ammonia through biological or chemical processes.

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