Various options are provided as possible answers to the following questions - NSC Life Sciences - Question 1 - 2017 - Paper 1
Question 1
Various options are provided as possible answers to the following questions. Choose the answer and write only the letter (A, B, C, or D) next to the question number ... show full transcript
Worked Solution & Example Answer:Various options are provided as possible answers to the following questions - NSC Life Sciences - Question 1 - 2017 - Paper 1
Step 1
1.1.1 The part of the brain that is responsible for higher thought processes is the ...
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Answer
The correct answer is D. cerebrum. The cerebrum is responsible for higher brain functions such as thought, action, and decision making.
Step 2
1.1.2 The central nervous system is made up of the ...
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Answer
The correct answer is B. brain and spinal cord. These components make up the central nervous system, which processes information and coordinates actions.
Step 3
1.1.3 Which ONE of the following is the dark-coloured layer of the eye, which is rich in blood vessels?
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Answer
The correct answer is D. Choroid. The choroid layer contains blood vessels that nourish the outer part of the retina.
Step 4
1.1.4 Which ONE of the following parts of the eye contains the photoreceptors?
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Answer
The correct answer is A. Retina. The retina contains photoreceptors (rods and cones) that detect light.
Step 5
1.1.5 Which structures in the eye are responsible for the refraction of light?
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Answer
The correct answer is B. Lens and yellow spot. The lens refracts light onto the retina, while the yellow spot contains a high concentration of photoreceptors.
Step 6
1.1.6 Which ONE of the following occurs when you look up from reading a book at a clear, sunny day to focus on a mountain more than 100 meters away?
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Answer
The correct answer is B. Ciliary muscles relax. This allows the lens to become less convex for distance vision.
Step 7
1.1.7 Which ONE of the following pathways represents a reflex arc?
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Answer
The correct answer is D. Receptor ➔ Spinal cord ➔ Muscle. This sequence describes a basic reflex arc pathway.
Step 8
1.1.8 After exercising in a gymnasium, people often go into a steam room to relax their muscles. The average temperature in a steam room is 41 °C and the humidity is between 80% and 100%.
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Answer
This scenario highlights the physiological response of the body to heat. It promotes sweating and vasodilation to help cool the body.
Step 9
1.1.9 A tumour in the hypothalamus of the brain of a patient caused a condition called diabetes insipidus. Below are some of the patient’s symptoms:
- Dehydration
- Production of large quantities of dilute urine
Which ONE of the following is the most likely effect of the tumour?
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Answer
The correct answer is B. Decreased secretion of ADH. This leads to increased urine output and dehydration.
Step 10
1.1.10 Contraceptive pills which prevent pregnancy are likely to contain ...
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Answer
The correct answer is B. Low levels of FSH and oestrogen. These hormones help prevent ovulation.
