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Question (11)

QN001471

A student increased the chewing time of rice from 20 seconds to 60 seconds before testing with iodine. The blue-black colour became lighter. What does this indicate?

(A) More starch remained unchanged
(B) More starch changed into sugar
(C) Sugar converted into starch
(D) Rice lost all nutrients

Correct Answer: B

Explanation:

Longer chewing allows more starch digestion.

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Question (12)

QN001472

Which organ pushes food into the food pipe with the help of saliva?

(A) Tongue
(B) Liver
(C) Pancreas
(D) Rectum

Correct Answer: A

Explanation:

The tongue pushes softened food into the food pipe.

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Question (13)

QN001473

The wave-like movement that pushes food through the alimentary canal is due to

(A) heartbeat
(B) lung expansion
(C) contraction and relaxation of walls
(D) action of teeth

Correct Answer: C

Explanation:

Muscular contractions move food forward.

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Question (14)

QN001474

Which structure connects the mouth to the stomach?

(A) Small intestine
(B) Windpipe
(C) Oesophagus
(D) Rectum

Correct Answer: C

Explanation:

The oesophagus carries food to the stomach.

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Question (15)

QN001475

Food moves down the oesophagus mainly because of

(A) gravity only
(B) saliva pressure
(C) wave-like muscular movement
(D) movement of ribs

Correct Answer: C

Explanation:

Peristaltic movement pushes food downward.

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Question (16)

QN001476

Which substance in the stomach kills many harmful bacteria?

(A) Mucus
(B) Acid
(C) Saliva
(D) Bile

Correct Answer: B

Explanation:

Acid in the stomach kills harmful bacteria.

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Question (17)

QN001477

What is the main role of mucus in the stomach?

(A) To digest fats
(B) To absorb nutrients
(C) To protect the stomach lining
(D) To produce bile

Correct Answer: C

Explanation:

Mucus protects the stomach wall from acid.

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Question (18)

QN001478

Which nutrient begins major digestion in the stomach?

(A) Protein
(B) Vitamins
(C) Minerals
(D) Water

Correct Answer: A

Explanation:

Protein digestion begins in the stomach.

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Question (19)

QN001479

In which form does food leave the stomach?

(A) Dry powder
(B) Semi-liquid mass
(C) Hard lumps
(D) Gas

Correct Answer: B

Explanation:

Food becomes a semi-liquid mass in the stomach.

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Question (20)

QN001480

Which organ secretes bile?

(A) Pancreas
(B) Small intestine
(C) Liver
(D) Stomach

Correct Answer: C

Explanation:

The liver secretes bile.

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Question (11)

A student increased the chewing time of rice from 20 seconds to 60 seconds before testing with iodine. The blue-black colour became lighter. What does this indicate?

Explanation:

Link:

Question (12)

Which organ pushes food into the food pipe with the help of saliva?

Explanation:

Link:

Question (13)

The wave-like movement that pushes food through the alimentary canal is due to

Explanation:

Link:

Question (14)

Which structure connects the mouth to the stomach?

Explanation:

Link:

Question (15)

Food moves down the oesophagus mainly because of

Explanation:

Link:

Question (16)

Which substance in the stomach kills many harmful bacteria?

Explanation:

Link:

Question (17)

What is the main role of mucus in the stomach?

Explanation:

Link:

Question (18)

Which nutrient begins major digestion in the stomach?

Explanation:

Link:

Question (19)

In which form does food leave the stomach?

Explanation:

Link:

Question (20)

Which organ secretes bile?

Explanation:

Link:

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