Subject

Biology

Class

NEET Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

11.

Arrange the following compounds formed in respiration based on their C-atoms in ascending order.

I. Pyruvic acid

II. α-ketoglutaric acid

III. Citric acid

IV. Malic acid

The correct answer is

  • IV, I, II and III

  • I, IV, II and III

  • I, II, IV and III

  • I, IV, III and II


B.

I, IV, II and III

Ascending order of the compounds formed in respiration based on their C- atoms is

Pyruvic acid (3C) < Malic acid (4C) <α- ketoglutaric acid (5C) < Citric acid (6C)

Compound C- atpms
I.Pyruvic acid 3 C
II.α- ketoglutaric acid 5 C
III.Citric acid 6 C
IV.Malic acid 4 C

12.

With refrence to the circulatory system of human foetus, which of the following statement is not correct?

  • Ductus arteriosus connects the pulmonary artery to the aorta

  • Foetal haemoglobin combines more readily with oxygen than adult haemoglobin does

  • Ductus venosus carries blood from placenta and foetal gut directly to the fetal liver

  • Blood is pumped to the placenta by the foetal heart


C.

Ductus venosus carries blood from placenta and foetal gut directly to the fetal liver

Ductus venosus carries blood from the placenta and foetal gut directly to the posterior vena cava, largely by passing the foetal liver. The liver in the foetus manufacture blood, rather than having the regulatory role it has in the adult mammals.


13.

Intrinsic factor produced by the oxyntic cells of human gut wall is essential for

  • converting the inactive pepsinogen to its active form pepsin

  • maintaining an extremely acid environment in the stomach

  • protecting the stomach wall and glands from autolysis (self-digestion)

  • absorption of vitamin B12 from the dietary supply


D.

absorption of vitamin B12 from the dietary supply

Intrinsic factor produced by oxyntic cells helps in the absorption of vitamin B12(or cobalamine). It is made by bacteria. It is obtain from our dietary supply from sea food, milk products and meat. The intestinal transporter of vitamin B12 is found only in the ilieum and recognises vitamin B12 only when it is complexed with intrinsic factor.


14.

Read the following statements.

Statement I. The flat bones of skull are spongy without marrow cavity.

Statement II. Specialised Bones of skull in mammals are called diploic bones.

Identify wheather the given statements are true or false and choose the correct option.

  • Statement I Statement II
    True False
  • False True
  • True True
  • False False


C.

True True

The flat bones of skull are specialised as they have spongy bone without marrow cavity. These are covered up by a sheet of compact bone on its both the surface. These specialised bones of skull in mammals are called diploic bones.


15.

Which of the following is correctly matched for the deficiency symptom produced by them?

  • Molybdenum - Disturbance in iron metabolism

  • Sodium - Interfere with healthy growth of nails and hair

  • Protein - Convulsions and hallucinations

  • Riboflavin - Beri beri


A.

Molybdenum - Disturbance in iron metabolism

Molybdenum is the part of several enzymes essential for the synthesis of haemoglobin and absorption of iron. Its deficiency leads to disturbance in iron metabolism, which affects growth of the body.


16.

The integral membrane protein that carries blood group antigenic determinants is

  • Rhodopsin

  • Seipin

  • Glycophorin

  • CD36


C.

Glycophorin

Human RBCs, glycophorins are intergral membrane protein rich in sialic acid. They carry blood group antigenic determinants. It is a membrane spanning protein and carries sugar molecules. It is heavily glycosylated.


17.

Statement I. The renal fluid becomes increasingly concentrated, when it flows down in the descending limb of loop of Henle towards inner medulla, but its concentration decreases in the ascending limb, when it flows towards the cortex.

Statement II. The descending limb of the loop of Henle water is reabsorbed; the ascending limb is impermeable to water, but salts are absorbed.

  • Statement I is correct, but Statement II is incorrect

  • Statement II is correct, but Statement I is incorrect

  • Both statements are correct

  • Both statements are incorrect


A.

Statement I is correct, but Statement II is incorrect

The cellophane tube is surrounded by a fluid having same composition as plasma except nitrogenous wastes. The porous cellophane membrane of the tube allows the passage of molecule based on concentration gradient. It is impermeable to large molecules but permeable to micromolecules.


18.

Read the following deficiency symptoms of micronutrients in plants.

I. Loosening of inflorescence in Cauliflower.

II. Apical necrosis of young leaves (reclamation disease).

III. Bronze colour in leaves

IV. Upper half a lamina falls down (whiptail disease)

V. Legume cotyledons with brownish spots (marsh spot disease)

Pick out the symptoms caused by the deficiency of molybdenium and choose the correct option.

  • II, IV and V

  • I, III and IV

  • III and II

  • I and IV


D.

I and IV

Molybdenum is a micronutrient found everywhere in plants more commonly in roots. Its major functions include nitrogen metabolism, ascorbic acid synthesis and oxidation reduction reaction. Its deficiency causes mottled chlorosis with marginal necrosis, whiptail diseases, etc.


19.

Choose the correctly paired sets from the following.

Set I Set II Set III
I.Sphenoid bone Key- stone bone Cranium
II.Acromion process Collor bone Scapula
III.Xiphoid process Breast bone Thorax
IV.Odontoid process Atlas Cervical vertebra

  • I, IV

  • II, IV

  • II, III

  • I, III


D.

I, III

Set I Set II Set III
I.Sphenoid bone Key- stone bone Cranium
II.Acromion process Shoulder joint Scapula
III.Xiphoid process Breast bone Thorax
IV.Odontoid process Axis Second cervical vertebra

20.

The hormone involved in the regulation of florigen synthesis is

  • ethylene

  • zeatin

  • cytokinin

  • gibberrellin


D.

gibberrellin

Florigen or flowering hormone is the hypothesized hormone like molecule responsible for controlling or triggering flowering in plants.

Gibberrellins (GA) are plant hormones that regulate growth and influence various developmental process like flowering, elongation, germination, etc.