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Question (41)

QN0036062

A fish has a two-chambered heart. During one complete cycle of circulation, how many times does blood pass through its heart?

(A) Once
(B) Twice
(C) Three times
(D) Four times

Correct Answer: A

Explanation:

In fish, blood passes through the heart once during one complete circulation cycle.

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Question (42)

QN0036063

In humans, blood passes through the heart twice during one complete circulation cycle. This is called

(A) single circulation
(B) double circulation
(C) diffusion
(D) translocation

Correct Answer: B

Explanation:

Passage of blood through the heart twice in one complete cycle is called double circulation.

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Question (43)

QN0036064

An artery is cut and begins to bleed under relatively high pressure. Which feature of arteries helps them withstand this pressure?

(A) Thick and elastic walls
(B) One-cell-thick walls
(C) Absence of muscular tissue
(D) Large valves throughout

Correct Answer: A

Explanation:

Arteries receive blood directly from the heart under high pressure and therefore have thick, elastic walls.

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Question (44)

QN0036065

Why are capillary walls only one cell thick?

(A) To allow efficient exchange of materials between blood and tissues
(B) To prevent all diffusion
(C) To store blood
(D) To pump blood back to the heart

Correct Answer: A

Explanation:

Thin capillary walls allow substances to move efficiently between blood and surrounding cells.

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Question (45)

QN0036066

A plant has healthy roots but its leaves receive very little water during the daytime. Which process is most likely impaired?

(A) Transpiration pull
(B) Food digestion
(C) Blood circulation
(D) Urine formation

Correct Answer: A

Explanation:

During the day, when stomata are open, transpiration pull is the major driving force for upward movement of water in xylem.

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Question (46)

QN0036067

Which pairing correctly represents the two major transport tissues in plants?

(A) Xylem—food; Phloem—water
(B) Xylem—water and minerals; Phloem—food
(C) Xylem—oxygen; Phloem—carbon dioxide
(D) Xylem—proteins; Phloem—urine

Correct Answer: B

Explanation:

Xylem transports water and minerals from roots, while phloem transports products of photosynthesis.

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Question (47)

QN0036068

A plant transports sucrose from leaves to storage organs using phloem. In which directions can this movement occur according to the chapter?

(A) Only upward
(B) Only downward
(C) Both upward and downward
(D) Only from roots to leaves

Correct Answer: C

Explanation:

Phloem translocation can occur in both upward and downward directions according to the plant's requirements.

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Question (48)

QN0036069

A human kidney initially filters about 180 L of filtrate per day, but only about 1–2 L of urine is actually excreted. What mainly explains this difference?

(A) Most of the filtrate is selectively reabsorbed
(B) Most filtrate becomes blood immediately
(C) Kidneys stop filtering during the day
(D) The bladder destroys the filtrate

Correct Answer: A

Explanation:

Useful substances such as glucose, amino acids, salts and much of the water are selectively reabsorbed in the kidney tubules.

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Question (49)

QN0036070

If the nephrons of the kidneys cannot properly filter blood, which function would be directly affected?

(A) Removal of nitrogenous wastes
(B) Absorption of sunlight
(C) Transport of food by phloem
(D) Production of saliva

Correct Answer: A

Explanation:

Nephrons are the filtration units of kidneys and remove nitrogenous wastes such as urea and uric acid from the blood.

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Question (50)

QN0036071

A plant loses some of its leaves and stores certain waste substances in old xylem as resins and gums. What does this illustrate?

(A) Plants have no mechanism for waste removal
(B) Plants use several strategies for excretion
(C) Plants excrete only through roots
(D) Plants convert all waste into food

Correct Answer: B

Explanation:

Plants can store wastes in vacuoles, leaves, resins and gums, or release some wastes into the surrounding soil.

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Question (41)

A fish has a two-chambered heart. During one complete cycle of circulation, how many times does blood pass through its heart?

Explanation:

Link:

Question (42)

In humans, blood passes through the heart twice during one complete circulation cycle. This is called

Explanation:

Link:

Question (43)

An artery is cut and begins to bleed under relatively high pressure. Which feature of arteries helps them withstand this pressure?

Explanation:

Link:

Question (44)

Why are capillary walls only one cell thick?

Explanation:

Link:

Question (45)

A plant has healthy roots but its leaves receive very little water during the daytime. Which process is most likely impaired?

Explanation:

Link:

Question (46)

Which pairing correctly represents the two major transport tissues in plants?

Explanation:

Link:

Question (47)

A plant transports sucrose from leaves to storage organs using phloem. In which directions can this movement occur according to the chapter?

Explanation:

Link:

Question (48)

A human kidney initially filters about 180 L of filtrate per day, but only about 1–2 L of urine is actually excreted. What mainly explains this difference?

Explanation:

Link:

Question (49)

If the nephrons of the kidneys cannot properly filter blood, which function would be directly affected?

Explanation:

Link:

Question (50)

A plant loses some of its leaves and stores certain waste substances in old xylem as resins and gums. What does this illustrate?

Explanation:

Link:

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