Subject

Biology

Class

NEET Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

1.

Fixation of one CO2 molecule through the Calvin cycle requires.

  • 1 ATP and 2NADPH2

  • 2 ATP and 2NADPH2

  • 3 ATP and 2NADH2

  • 2 ATP and 1 NADPH2


C.

3 ATP and 2NADH2

2 ATP is required during conversion of PGA to 1,3 diphosphoglyceric acid and 1 ATP during conversion of glyceraldehyde phosphate to ribulose biphosphate. 2NADPH2 molecules are utilised for converting 1,3 diphosphoglyceric acid to glyceraldehyde phosphate.


2.

A plant is provided with the ideal conditions for photosynthesis and supplied with isotope 14 CO2. When the products of the process are analysed carefully, what would be the nature of products?

  • Glucose and oxygen are labelled

  • Oxygen is labelled, but glucose is normal

  • Glucose and oxygen are normal 

  • Glucose is labelled, but oxygen is normal


D.

Glucose is labelled, but oxygen is normal

In the process of photosynthesis

6CO2 + 12H2O hv C6H12O6  + 6H2O + 6O2 

Plants manufacture glucose from H2O and CO2 and oxygen gas is released. So, due to the isotopic carbon of CO2, only glucose will be labelled, but oxygen will be normal.


3.

Torsion of visceral mass is seen in animals belonging to the class

  • Cephalopoda

  • Scaphopoda

  • Amphineura

  • Gastropoda


D.

Gastropoda

Animals of class-Gastropoda of phylum-Mollusca undergo twisting of torsion of the visceral mass during development, leading to the conversion of the symmetrical embryo into an asymmetrical adult.


4.

Oxygen dissociation curve of haemoglobin is 

  • sigmoid

  • hyperbolic

  • linear

  • hypobolic


A.

sigmoid

Oxygen-haemoglobin dissociation curve gives the relationship between the saturation of haemoglobin and oxygen tension.

The curve obtained by plotting the per cent saturation of Hb against time is sigmoid, at 38oC and pH 7.4. Dissociation of oxyhaemoglobin can be promoted by rising in the body temperature and low pH (high CO2)


5.

Match the following columns.

Column I Column II
A Sacral nerves 1. 1 Pair
B Thoraic nerves 2. 8 Pair
C Cocygeal nerves 3. 7 Pairs
D Cervical nerves 4. 12 Pairs
    5. 5 Pairs

  • A B C D
    4 1 3 2
  • A B C D
    5 3 1 2
  • A B C D
    5 4 1 1
  • A B C D
    2 5 3 1

C.

A B C D
5 4 1 1

6.

A hormone, secreted by the endocrinal cells of duodenal mucosa which influences the releases of pancreatic juice is

  • relaxin

  • cholecystokinin

  • Secretin

  • Progesterone


B.

cholecystokinin

Cholecystokinin Pancreozymin (CCK-PZ) is the hormone secreted from mucosa of the small intestine. It stimulates the pancreas to release enzymatic (Pancreatic) juice and gallbladder to eject bile.


7.

Herbicide that blocks electrons transport from PS-II to PS-I by inhibiting electron flow between plastoquinone → Cytochrome is

  • DCMU

  • Paraquat

  • DCPIP

  • None of these


A.

DCMU

DCMU is a selective herbicide that acts as a potent inhibitor of PS-II. Paraquat inhibits PS-I by producing superoxides.

DCPIP is a dye used to measure the rate of photosynthesis.


8.

Pick the hormone which is not secreted by human placenta.

  • hCG

  • hPL

  • Prolactin

  • Oestrogen


C.

Prolactin

Prolactin is secreted by a pituitary gland, whereas the hCG, hPL and oestrogen are secreted by the human placenta.


9.

Some functions of the nutrient element are given below

  1. Important constituent of proteins involved in ETS.
  2. Activator of catalase.
  3. Important constituent of cytochrome
  4. Essential for chlorophyll synthesis

The concerned nutrient is

  • Cu

  • Fe

  • Ca

  • Mo


B.

Fe

Iron (Fe) is the concerned nutrient associated with the above-given functions.


10.

Statement I Microtubules are formed only in animal cells. 

Statement II Microtubules are made up of a protein called myosin.

Choose the correct option

  • Statement I is correct and statement II is incorrect.

  • Statement II is correct and statement I is incorrect.

  • Both statement are correct

  • Both statements are incorrect


D.

Both statements are incorrect

Microtubules are found in both animal and plant cells and are formed of the protein tubulin.