NSC Life Sciences Mitosis and Meiosis: 2.1 The diagram below represents

Question

2.1 The diagram below represents the human male reproductive system.

2.1.1 Identify part A.

2.1.2 Write down the LETTERS only of TWO parts that contribute to the formation of semen.

2.1.3 Explain the consequence on human reproduction if a male wears tight-fitting underwear all the time.

2.2 A fertility monitor measures the concentration of oestrogen and luteinising hormone (LH) in a woman's urine. A fertile period is the time when the ovum is ready to be fertilised.

The graph below appears on the information sheet that is provided with the fertility monitor.

2.2.1 Name the gland that secretes LH.

2.2.2 Explain why the fertility monitor measures the concentration of LH.

2.2.3 Explain why some women would use a fertility monitor.

2.2.4 What evidence in the graph indicates that a healthy follicle is developing in the ovary during the first half of the cycle?

2.2.5 If a woman using the fertility monitor finds that her LH level peaks on day 17, between which days does she experience the highest fertility?

2.2.6 Explain why the fertility monitor does not measure the progesterone level in the blood to predict fertile days.

2.3 An investigation was carried out to determine the effect of caffeine on body temperature and pulse rate. A group of 200 men participated in the investigation.

At the start of the investigation each man's body temperature was measured, and the average of all the participants was calculated.

Also, at the start of the investigation each man's pulse rate was measured, and the average of all the participants was calculated.

The men each drank 100 ml of an energy drink containing the same amount of caffeine.

Their body temperatures were then measured every 15 minutes for a period of 60 minutes, and the average of all the participants was calculated.

Also, their pulse rate was then measured every 15 minutes for a period of 60 minutes, and the average of all the participants was calculated.

The table below shows the results of the investigation.

TIME (minutes)    AVERAGE TEMPERATURE (°C)   AVERAGE PULSE RATE (BPM)
0                  36.6                       76
15                 37.4                       91
30                 38                         97
45                 37.8                       89
60                 37.4                       85

2.3.1 Describe the effect that caffeine had on body temperature and pulse rate after 15 minutes.

2.3.2 How long after drinking the energy drink did body temperature have its maximum effect?

2.3.3 Caffeine causes vasoconstriction and an increase in metabolism. Explain how these effects contribute to the temperature change that occurred.

2.3.4 State TWO factors that keep body constant during this investigation.

2.4 Describe how the blood glucose level in the human body is returned to normal when the glucose level decreases to below normal.

2.5 The diagram below shows the results of an investigation carried out to determine the effect of auxins on the growth of coleoptiles (young shoots).

The procedure was as follows:

Three coleoptiles were used. Coleoptile A had its apical bud removed. Coleoptile B had its apical bud covered with a black plastic cover. Coleoptile C had its apical bud covered with a transparent plastic cover. All three coleoptiles (A, B and C) were then exposed to unilateral sunlight.

The diagram below shows the results of the investigation.

2.5.1 Explain the results obtained, as shown by coleoptile:
(a) B
(b) C

2.5.2 Explain why lateral branches will develop in coleoptile A.

2.1 The diagram below represents the human male reproductive system - NSC Life Sciences - Question 2 - 2016 - Paper 1

Worked Solution & Example Answer:2.1 The diagram below represents the human male reproductive system - NSC Life Sciences - Question 2 - 2016 - Paper 1

Identify part A.

Write down the LETTERS only of TWO parts that contribute to the formation of semen.

Explain the consequence on human reproduction if a male wears tight-fitting underwear all the time.

Name the gland that secretes LH.

Explain why the fertility monitor measures the concentration of LH.

Explain why some women would use a fertility monitor.

What evidence in the graph indicates that a healthy follicle is developing in the ovary during the first half of the cycle?

If a woman using the fertility monitor finds that her LH level peaks on day 17, between which days does she experience the highest fertility?

Explain why the fertility monitor does not measure the progesterone level in the blood to predict fertile days.

Describe the effect that caffeine had on body temperature and pulse rate after 15 minutes.

How long after drinking the energy drink did body temperature have its maximum effect?

Caffeine causes vasoconstriction and an increase in metabolism. Explain how these effects contribute to the temperature change that occurred.

State TWO factors that keep body constant during this investigation.

Describe how the blood glucose level in the human body is returned to normal when the glucose level decreases to below normal.

Explain the results obtained, as shown by coleoptile B.

Explain the results obtained, as shown by coleoptile C.

Explain why lateral branches will develop in coleoptile A.

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