Various options are provided as possible answers to the following questions - NSC Life Sciences - Question 1 - 2019 - Paper 1
Question 1
Various options are provided as possible answers to the following questions. Choose the answer and write only the letter (A to D) next to the question numbers (1.1.1... show full transcript
Worked Solution & Example Answer:Various options are provided as possible answers to the following questions - NSC Life Sciences - Question 1 - 2019 - Paper 1
Step 1
1.1.1 Which ONE of the following hormones controls metabolic rate?
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Answer
The hormone that controls metabolic rate in the human body is B Thyroxine. Thyroxine, produced by the thyroid gland, significantly influences metabolism.
Step 2
1.1.2 Which ONE of the following will occur in the human body on a cold day?
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On a cold day, the body primarily undergoes C Decrease in evaporation of sweat from the surface of the skin to conserve heat and retain warmth.
Step 3
1.1.3 Which ONE of the following combinations includes factors that increase food security?
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Answer
The combination that includes factors increasing food security is D (i) and (iv) only, where the use of pesticides and fertilizers can enhance crop yield and quality.
Step 4
1.1.4 Which part of the neuron transmits impulses towards the cell body?
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Answer
A Dendrite is the part of the neuron that transmits impulses toward the cell body, facilitating communication between neurons.
Step 5
1.1.5 Which part stores sperm until maturation?
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Answer
B 2 refers to the epididymis, which stores and matures sperm before they are released.
Step 6
1.1.6 A man who had cancer underwent surgery to remove part 1 and part 2.
The man ...
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Answer
In this scenario, A will be able to release semen not containing sperm and therefore cannot reproduce because both parts necessary for production and transport of sperm have been removed.
Step 7
1.1.7 Which ONE of the following shows the results when a cell with 20 chromosomes undergoes mitosis?
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Answer
The correct choice here is A Number of daughter cells 2; Number of chromosomes 20 since mitosis results in two identical daughter cells maintaining the chromosome number.
Step 8
1.1.8 Which ONE of the following is a function of amniotic fluid?
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Answer
B Protects the fetus from temperature changes is the primary function of amniotic fluid, providing a stable environment for fetal development.
Step 9
1.1.9 Which part of the ear contains the receptors for hearing?
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A Cochlea is the part of the inner ear where hair cells (receptors) convert sound vibrations into neural signals.
Step 10
1.1.10 Which ONE of the following is a consequence if the round window of the ear hardens?
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If the round window hardens, B Impulses will not be transmitted to the brain effectively, disrupting the hearing process.
