1.1 Various options are provided as possible answers to the following questions - NSC Life Sciences - Question 1 - 2017 - Paper 1
Question 1
1.1 Various options are provided as possible answers to the following questions. Choose the answer and write only the letter (A, B, C, D) next to the question number... show full transcript
Worked Solution & Example Answer:1.1 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, which is known for higher cognitive functions including reasoning and problem-solving.
Step 2
1.1.2 The central nervous system is made up of the ...
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Answer
The right choice is B. brain and spinal cord, as these are the main components of the central nervous system.
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, which provides nourishment to the outer retinal layers.
Step 4
1.1.4 Which ONE of the following parts of the eye contains the photoreceptors?
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Answer
Answer A. Retina contains photoreceptors (rods and cones) essential for vision.
Step 5
1.1.5 Which structures in the eye are responsible for the refraction of light?
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Answer
The answer is B. Lens and yellow spot, with the lens being critical for focusing light.
Step 6
1.1.6 Which ONE of the following occurs when you look up from reading a book on a clear, sunny day to focus on a mountain more than 100 meters away?
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Answer
The right choice is B. Ciliary muscles relax, allowing the lens to flatten 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 sequence is D. Receptor → Spinal cord → Muscle, which is typical of a simple reflex 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
After physical activity, the relaxing heat of the steam room aids in muscle recovery and alleviates tension.
Step 9
1.1.9 A tumor in the hypothalamus of the brain of a patient caused a condition called diabetes insipidus. Below are some of the patient's symptoms:
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Answer
This indicates dysfunction in water regulation, resulting from reduced secretion of ADH (antidiuretic hormone).
Step 10
1.1.10 Contraceptive pills which prevent pregnancy are likely to contain ...
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Answer
The answer is B. low levels of FSH and estrogen, which inhibit ovulation.
