NSC Life Sciences Responding to the Environment: Humans: 3.1 The diagrams below represent

Question

3.1 The diagrams below represent the growth responses of two different plant organs to external stimuli.

The arrows indicate the direction of growth responses.

- A
- B
- C
- D

3.1.1 Name the group of plant hormones that is responsible for the growth responses observed in the diagrams.

3.1.2 Name the external stimulus at:
(a) A
(b) D

3.1.3 Give ONE observable reason why plant organ B is a stem.

3.1.4 Explain the growth response observed in plant organ C.

3.2 The diagram below represents two possible pathways, A and B, which a nerve impulse may follow in the human body.

3.2.1 Which pathway, A or B, represents a reflex arc?

3.2.2 Give a visible reason in the diagram for your answer to QUESTION 3.2.1.

3.2.3 Describe the importance of a reflex action in the human body.

3.2.4 Identify the part of the nervous system represented by:

3.2.5 Explain ONE way in which the myelin sheath is important in the functioning of neurons.

3.2.6 Describe how the person would be affected if the axon of neuron 2 was cut.

3.2.7 Describe pathway B.

3.3 The graphs below show the effects of eating many small meals and eating fewer large meals on blood glucose and insulin concentrations in a normal person.

The arrows on the graphs below indicate when meals were eaten. The normal blood glucose concentration is 100 mg/dl.

3.3.1 State what happens to the blood glucose concentration immediately after a meal is eaten.

3.3.2 Tabulate TWO ways in which eating fewer large meals and eating many small meals affect the blood insulin levels differently.

3.3.3 Explain why eating many small meals per day is better for a diabetic person than eating fewer large meals.

3.4 The diagrams below represent structures in the skin of two people. Both people were in the same room at the same time, but one person was exercising while the other person was sitting still. The skin surface temperature of both people was measured after 10 minutes.

- Person A: 37.2 °C
- Person B: 36.6 °C

3.4.1 Which person, A or B, was exercising?

3.4.2 Give TWO visible reasons for your answer to QUESTION 3.4.1.

3.4.3 Name ONE hormone that would have the same effect on the blood vessels that is observable in person A.

3.4.4 After 10 minutes the surface skin temperature of each person was measured.
Explain why the skin temperature of person A was higher after 10 minutes.

Fewer large meals	Many smaller meals
Higher insulin concentration	Lower insulin concentration
Fewer spikes in insulin levels	More frequent variations in insulin levels

3.1 The diagrams below represent the growth responses of two different plant organs to external stimuli - NSC Life Sciences - Question 3 - 2018 - Paper 1

Worked Solution & Example Answer:3.1 The diagrams below represent the growth responses of two different plant organs to external stimuli - NSC Life Sciences - Question 3 - 2018 - Paper 1

Name the group of plant hormones that is responsible for the growth responses observed in the diagrams.

Name the external stimulus at: (a) A

Name the external stimulus at: (b) D

Give ONE observable reason why plant organ B is a stem.

Explain the growth response observed in plant organ C.

Which pathway, A or B, represents a reflex arc?

Give a visible reason in the diagram for your answer to QUESTION 3.2.1.

Describe the importance of a reflex action in the human body.

Identify the part of the nervous system represented by:

Explain ONE way in which the myelin sheath is important in the functioning of neurons.

Describe how the person would be affected if the axon of neuron 2 was cut.

Describe pathway B.

State what happens to the blood glucose concentration immediately after a meal is eaten.

Tabulate TWO ways in which eating fewer large meals and eating many small meals affect the blood insulin levels differently.

Explain why eating many small meals per day is better for a diabetic person than eating fewer large meals.

Which person, A or B, was exercising?

Give TWO visible reasons for your answer to QUESTION 3.4.1.

Name ONE hormone that would have the same effect on the blood vessels that is observable in person A.

Explain why the skin temperature of person A was higher after 10 minutes.

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