Subject

Biology

Class

NEET Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

1.

Find out the mismatched pair

  • C4 plants - Kranz anatomy

  • Primary CO2 fixation product of C4 plants - OAA

  • Primary CO2 acceptor of C3  plants - RuBP

  • Calvin pathway of C4 plants occur in  - Bundle sheath 

  • Calvin pathway of C4 plants occur in  - Bundle sheath 


E.

C3 plants - Maize

Out of all the given options, maize is not an example of C3 plants.


2.

Which of the following statements regarding fats is true?

  • Arachidonic acid has 20 carbons excluding the carboxyl carbon.

  • Glycerol is a trihydroxy propane.

  • Palmitic acid has 18 carbons including the carboxyl carbon.

  • Oils have higher melting points than fats.

  • Oils have higher melting points than fats.


B.

Glycerol is a trihydroxy propane.

Glycerol and trihydroxypropane are common names. It comes from the root glyco- which means sweet. Hence, glucose, glycogen and glycerin have the same etymology.


3.

In which of the following steps of citric acid cycle, COis evolved?

I. Citric acid – Ketoglutaric acid 

II. Succinic acid – Malic acid 

III. Malic acid – Oxaloacetic acid 

IV. α-ketoglutaric acid – Succinyl CoA

  • I and II only

  • I and IV only

  • II and III only

  • II and IV only

  • II and IV only


B.

I and IV only

Two decarboxylation reactions takes place in citric acid cycle, i.e.

(C6H8O7) Citric acidα- ketoglutaric acid

α- ketoglutaric acid Succinyl CoA


4.

Which of the following statements regarding cyclic flow of electrons during light reactions is false?

  • This process takes place in the stromal lamella

  • ATP synthesis takes place

  • NADPH + H+ is synthesized

  • Takes place only when light of wavelength beyond 680 nm is available for excitation

  • Takes place only when light of wavelength beyond 680 nm is available for excitation


C.

NADPH + H+ is synthesized

Out of all the five options, option 3 is wrong as NADPH + Hare not synthesized during light reaction.


5.

Choose the wrong statement

  • Cells swell in hypertonic solutions and shrink in hypotonic solutions

  • Water potential is the kinetic energy of water which helps in the movement of water

  • The absorption of water by seeds and dry wood takes place by a special type of diffusion called imbibition

  • Solute potential or PS is always negative

  • Solute potential or PS is always negative


A.

Cells swell in hypertonic solutions and shrink in hypotonic solutions

Cell shrink in hypertonic solution and swell in hypotonic solution.


6.

When one element is involved in opening and closing of stomata, the other helps to maintain the ribosome  structure. They are

  • Potassium and calcium

  • Phosphorus and sulphur

  • Potassium and magnesium

  • Iron and magnesium

  • Iron and magnesium


C.

Potassium and magnesium

Magnesium is absorbed by plants in the form of divalent Mg2+. It activates the enzymes of respiration, photosynthesis and are involved in the synthesis of DNA and RNA. It is a constituent of the ring structure of chlorophyll and helps to maintain the ribosome structure.

Potassium is absorbed as potassium ion (K+). It helps to maintain an anion-cation balance in cells and is involved in protein synthesis, opening and closing of stomata,
activation of enzymes and in the maintenance of the turgidity of cells.


7.

Which of the following groups of minerals are micronutrients?

  • Magnesium, Manganese, Copper, Boron and Phosphorus

  • Manganese, Copper, Magnesium, Zinc and Boron

  • Nitrogen, Potassium, Manganese, Copper and Iron

  • Iron, Manganese, Copper, Molybdenum and Zinc

  • Iron, Manganese, Copper, Molybdenum and Zinc


D.

Iron, Manganese, Copper, Molybdenum and Zinc

Micro nutrients are nutrients needed by plant body in
relatively small amounts (equal or less than 0.1 mg per gram dry matter). They are mostly involved in the functioning of enzymes, cofactors or metal activators. E.g. copper, iron, molybdenum, zinc, boron, chlorine, nickel, manganese etc.


8.

Match the mineral in Column I with the enzyme activated in
Column II and choose the correct option.

Column I Column II
(A) Magnesium (1) Alcohol dehydrogenase
(B) Molybdenum (2) Phosphoenolpyruvate carboxylase
(C) Zinc (3) Nitrogenase

  • A - 2; B - 3; C - 1

  • A - 1; B - 2; C - 3

  • A - 2; B - 1; C - 3

  • A - 3; B - 2; C - 1

  • A - 3; B - 2; C - 1


A.

A - 2; B - 3; C - 1

Column I Column II
(A) Magnesium (2) Phosphoenolpyruvate carboxylase
(B) Molybdenum (3) Nitrogenase
(C) Zinc (1) Alcohol dehydrogenase

9.

Coenzymes NAD and NADP contain the vitamins

  • Niacin

  • Biotin

  • Thiamine

  • Vitamin B12

  • Vitamin B12


A.

Niacin

The common name of Niacin or Nicotinic acid is Vitamin-PP (Pellagra Preventive). It acts as coenzymes in hydrogen transport as NAD/Coenzyme-I and NADP/Coenzyme-II.


10.

Which of these is/are not a property of facilitated transport?

(A) Requires special membrane proteins 

(B) Highly selective 

(C) Uphill transport 

(D) Requires ATP energy

  • (A) and (B) only

  • (C) and (D) only

  • (A) and (C) only

  • (B) and (C) only

  • (B) and (C) only


B.

(C) and (D) only

Facilitated diffusion or facilitated transport or passive-mediated transport is the process of spontaneous passive transport of molecules or ions across a biological membrane via specific transmembrane integral proteins. It neither requires ATP nor follow uphill transport.