Default Title

Question (21)

QN001531

Lime water turns milky mainly due to the presence of

(A) oxygen
(B) nitrogen
(C) carbon dioxide
(D) water vapour

Correct Answer: C

Explanation:

Carbon dioxide turns lime water milky.

Link:

Report Error

Question (22)

QN001532

In the lime water activity, exhaled air turns lime water milky faster because it contains

(A) less oxygen
(B) more carbon dioxide
(C) more nitrogen
(D) no water vapour

Correct Answer: B

Explanation:

Exhaled air contains more carbon dioxide.

Link:

Report Error

Question (23)

QN001533

Which of the following contains a higher percentage of oxygen?

(A) Exhaled air
(B) Inhaled air
(C) Both contain equal oxygen
(D) Neither contains oxygen

Correct Answer: B

Explanation:

Inhaled air contains more oxygen.

Link:

Report Error

Question (24)

QN001534

Approximately what percentage of oxygen is present in inhaled air according to the chapter?

(A) 4–5%
(B) 10–11%
(C) 16–17%
(D) 21%

Correct Answer: D

Explanation:

Inhaled air contains nearly 21% oxygen.

Link:

Report Error

Question (25)

QN001535

Approximately what percentage of carbon dioxide is present in exhaled air?

(A) 0.04%
(B) 1%
(C) 4–5%
(D) 21%

Correct Answer: C

Explanation:

Exhaled air contains nearly 4–5% carbon dioxide.

Link:

Report Error

Question (26)

QN001536

Which of the following is the correct word equation for respiration?

(A) Glucose + Carbon dioxide → Oxygen + Water + Energy
(B) Glucose + Oxygen → Carbon dioxide + Water + Energy
(C) Oxygen + Water → Glucose + Energy
(D) Carbon dioxide + Water → Glucose + Oxygen

Correct Answer: B

Explanation:

Respiration releases energy from glucose using oxygen.

Link:

Report Error

Question (27)

QN001537

Respiration is called a chemical process because it

(A) involves movement of ribs
(B) changes glucose into simpler substances with release of energy
(C) uses only physical force
(D) occurs outside the body

Correct Answer: B

Explanation:

Chemical changes occur during respiration.

Link:

Report Error

Question (28)

QN001538

Breathing is mainly considered a physical process because it involves

(A) chemical breakdown of glucose
(B) movement of air in and out of lungs
(C) production of digestive juices
(D) circulation of blood

Correct Answer: B

Explanation:

Breathing involves movement of air only.

Link:

Report Error

Question (29)

QN001539

Which process directly releases usable energy in the body?

(A) Breathing
(B) Digestion
(C) Respiration
(D) Absorption

Correct Answer: C

Explanation:

Respiration releases energy from food.

Link:

Report Error

Question (30)

QN001540

Oxygen transported by blood is mainly used for

(A) storing fats
(B) breaking down glucose
(C) producing saliva
(D) digesting proteins

Correct Answer: B

Explanation:

Oxygen helps break down glucose.

Link:

Report Error

Question (21)

Lime water turns milky mainly due to the presence of

Explanation:

Link:

Question (22)

In the lime water activity, exhaled air turns lime water milky faster because it contains

Explanation:

Link:

Question (23)

Which of the following contains a higher percentage of oxygen?

Explanation:

Link:

Question (24)

Approximately what percentage of oxygen is present in inhaled air according to the chapter?

Explanation:

Link:

Question (25)

Approximately what percentage of carbon dioxide is present in exhaled air?

Explanation:

Link:

Question (26)

Which of the following is the correct word equation for respiration?

Explanation:

Link:

Question (27)

Respiration is called a chemical process because it

Explanation:

Link:

Question (28)

Breathing is mainly considered a physical process because it involves

Explanation:

Link:

Question (29)

Which process directly releases usable energy in the body?

Explanation:

Link:

Question (30)

Oxygen transported by blood is mainly used for

Explanation:

Link:

Excel With Tutors

ExcelWithTutors

For Student

For Tutors

Learn

OUR POLICY