DP Biology (first assessment 2025)

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Question 20N.1A.HL.TZ0.21

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Date November 2020 Marks available [Maximum mark: 1] Reference code 20N.1A.HL.TZ0.21
Level HL Paper 1A Time zone TZ0
Command term Question number 21 Adapted from N/A
21.
[Maximum mark: 1]
20N.1A.HL.TZ0.21

What happens in the heart when epinephrine is secreted into the blood?

I. Pressure in the heart falls.

II. The pulmonary artery transports oxygenated blood at a faster rate.

III. The sinoatrial node increases the rate of electrical signals.

A. I only

B. I and II only

C. II and III only

D. III only

[1]

Markscheme

D

Examiners report

The discrimination index for this question was high, but only about a third of candidates answered it correctly. It was essential to read the question carefully and not jump to hasty conclusions. Of the three statements offered, II was not correct because the pulmonary artery does not carry oxygenated blood.

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