Read the following four statements, A, B,C and D select the righ

Subject

Biology

Class

NEET Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

1.

Which one of the following pairs of structures is correctly matched with their correct description?

  • Structure

    Description

    Tibia and fibula

    Both form parts of knee joint

  • Structure

    Description

    Cartilage and cornea

    No blood supply but do require oxygen for respiratory

  • Structure

    Description

    Shoulder joint and elbow joint

    Ball and socket type of joint

  • Structure

    Description

    Shoulder joint and elbow joint

    Ball and socket type of joint

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2.

Leguminous plants are able to fix atmospheric nitrogen through the process of symbiotic nitrogen fixation. Which one of the following statement is not correct during the process of nitrogen fixation?

  • Leghaemoglobin scavenges oxygen and is pinkish in colour

  • Nodules act as a site for nitrogen fixation

  • The enzyme nitrogenase catalyse the conversion of atmospheric N2 to NH3

  • The enzyme nitrogenase catalyse the conversion of atmospheric N2 to NH3

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3.

Which one of the following is a xerophytic plant in which the stem is modified into the flag green and succulent structure? 

  • Opunita

  • Casuarina

  • Hydrilla

  • Hydrilla

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4.

In which one of the following organism, its excretory organs are correctly stated?

  • Humans- Kidneys, sebaceous glands and tear glands

  • Earthworm -Pharyngeal, integumentary and septal nephridia

  • Cockroach - Malpighian tubules and enteric caeca

  • Cockroach - Malpighian tubules and enteric caeca

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5.

If for some reason the parietal cells of the gut epithelium become partially non-functional, what is likely to happen?

  • The pancreatic enzymes and specially the trypsin and lipase will not work efficiently

  • The pH of stomach will fall abruptly

  • Steapsin will be more effective

  • Steapsin will be more effective

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6.

Read the following four statements, A, B,C and D select the right option having both correct statements.

A) Z scheme of light reaction takes place in presence of PS- I only.

B) Only PS-I is functional in cyclic photophosphorylation.

C) Cyclic photophosphorylation results into synthesis of ATP and NADPH2

D) Stroma lamellae lack PS-II as well as NADP.

  • B and D

  • A and B

  • B and C

  • B and C


A.

B and D

Cyclic photophosphorylation is performed by PS-I only. In this process, an electron expelled by the excited photo centre, ie, P700 is returned to it after passing through a  series of electron carriers. 

PS- I is located on both the non- appressed part of grana thylakoids as well as stroma thylakoids, while PS-II is located in the appressed part of grana thylakoids only, stroma thylakoids lack PS-II.

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7.

Given below are four statements (A-D) regarding human blood circulatory system

  • Arteries are thick -walled and have narrow lumen as compared to veins

  • Angina is acute chest pain when the blood circulation to the brain reduced.

  • Persons with blood group-AB can donate blood to any person with any blood group under ABO system

  • Persons with blood group-AB can donate blood to any person with any blood group under ABO system

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8.

The haemoglobin content per 100 mL of blood of a normal healthy human adult is 

  • 5-11 g

  • 25-30 g

  • 17-20 g

  • 17-20 g

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9.

An example of endomycorrhiza is 

  • Nostoc

  • Glomus

  • Agaricus

  • Agaricus

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10.

One of the commonly used plant growth hormone in tea plantations is 

  • ethylene

  • abscisic acid

  • Zeatin

  • Zeatin

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