Assertion (A): Digestion breaks large complex

molecules to simple smaller molecules which can

be easily absorbed.

Reason (R): Digestion is necessary for the

absorption of all molecules.

(A) Both A and R are true and R is the correct

explanation of A.

(B) Both A and R are true but R is NOT the correct

explanation of A.

(C) A is true but R is false.

(D) A is false and R is true

Assertion (A): Muscles of stomach wall possess

thick layers of muscle fibers.

Reason (R): These muscles help in mixing the food

with the enzymes present in the alimentary canal.

(A) Both A and R are true and R is the correct

explanation of A.

(B) Both A and R are true but R is NOT the correct

explanation of A.

(C) A is true but R is false.

(D) A is false and R is true

Assertion (A): Muscles of stomach wall possess

thick layers of muscle fibers.

Reason (R): These muscles help in mixing the food

with the enzymes present in the alimentary canal.

(A) Both A and R are true and R is the correct

explanation of A.

(B) Both A and R are true but R is NOT the correct

explanation of A.

(C) A is true but R is false.

(D) A is false and R is true

Assertion (A): Lipases help in emulsification of

fats.

Reason (R): Lipases hydrolyses fats and oils.

(A) Both A and R are true and R is the correct

explanation of A.

(B) Both A and R are true but R is NOT the correct

explanation of A.

(C) A is true but R is false.

(D) A is false and R is true

Assertion (A): Photosynthesis is an anabolic

process.

Reason (R): The process of photosynthesis occurs

in chlorophyll.

(A) Both A and R are true and R is the correct

explanation of A.

(B) Both A and R are true but R is NOT the correct

explanation of A.

(C) A is true but R is false.

(D) A is false and R is true

Assertion (A): Energy is used during the process of

respiration.

Reason (R): Respiration stores energy in the form

of ATP.

(A) Both A and R are true and R is the correct

explanation of A.

(B) Both A and R are true but R is NOT the correct

explanation of A.

(C) A is true but R is false.

(D) A is false and R is true

Assertion (A): Humans are not truly aerobic.

Reason (R): They produce lactic acid anaerobically.

(A) Both A and R are true and R is the correct

explanation of A.

(B) Both A and R are true but R is NOT the correct

explanation of A.

(C) A is true but R is false.

(D) A is false and R is true

Assertion (A): In humans, there is a complex

respiratory system.

Reason (R): Human skin is impermeable to gases.

(A) Both A and R are true and R is the correct

explanation of A.

(B) Both A and R are true but R is NOT the correct

explanation of A.

(C) A is true but R is false.

(D) A is false and R is true

Assertion (A): Alveoli contain an extensive network

of blood vessels.

Reason (R): Alveoli is the site where exchange of

gases occurs

(A) Both A and R are true and R is the correct

explanation of A.

(B) Both A and R are true but R is NOT the correct

explanation of A.

(C) A is true but R is false.

(D) A is false and R is true

Assertion (A): The muscular walls of ventricles are

thicker than auricles.

Reason (R): This helps in preventing the back flow

of blood

(A) Both A and R are true and R is the correct

explanation of A.

(B) Both A and R are true but R is NOT the correct

explanation of A.

(C) A is true but R is false.

(D) A is false and R is true

Assertion (A): In human heart, there is no mixing of

oxygenated and deoxygenated blood.

Reason (R): Valves are present in the heart which

allows the movement of blood in one direction

only

(A) Both A and R are true and R is the correct

explanation of A.

(B) Both A and R are true but R is NOT the correct

explanation of A.

(C) A is true but R is false.

(D) A is false and R is true

Assertion (A): Valves are present in the arteries.

Reason (R): Arteries carry oxygenated blood from

heart to different body parts except pulmonary

artery

(A) Both A and R are true and R is the correct

explanation of A.

(B) Both A and R are true but R is NOT the correct

explanation of A.

(C) A is true but R is false.

(D) A is false and R is true

Assertion (A): Plants have low energy needs.

Reason (R): Plant bodies have large proportion of

dead cells

(A) Both A and R are true and R is the correct

explanation of A.

(B) Both A and R are true but R is NOT the correct

explanation of A.

(C) A is true but R is false.

(D) A is false and R is true

Assertion (A): Human body produces highly toxic

substances, which if not eliminated may cause the

death.

Reason (R): Excretory substance removes nitrog

enous waste from the body.

(A) Both A and R are true and R is the correct

explanation of A.

(B) Both A and R are true but R is NOT the correct

explanation of A.

(C) A is true but R is false.

(D) A is false and R is true

Assertion (A): Excretory unit of kidneys are

nephrons.

Reason (R): It has no role in secretion of urine.

(A) Both A and R are true and R is the correct

explanation of A.

(B) Both A and R are true but R is NOT the correct

explanation of A.

(C) A is true but R is false.

(D) A is false and R is true

Assertion (A): Haemodialysis can save the life of

patients with kidney failure.

Reason (R): Waste products like urea can be

removed from the blood by haemodialysis.

(A) Both A and R are true and R is the correct

explanation of A.

(B) Both A and R are true but R is NOT the correct

explanation of A.

(C) A is true but R is false.

(D) A is false and R is true

Assertion (A): In humans, major amount of water is

absorbed by the tubular part of nephron.

Reason (R): Absorption of water depends on the

dissolved waste to be excreted from the body.

(A) Both A and R are true and R is the correct

explanation of A.

(B) Both A and R are true but R is NOT the correct

explanation of A.

(C) A is true but R is false.

(D) A is false and R is true