1.1 Various options are provided as possible answers to the following questions - NSC Life Sciences - Question 1 - 2023 - 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-D) next to the question numbers (1.1.... 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 - 2023 - Paper 1
Step 1
1.1.1 Which ONE of the following parts controls the amount of light entering the eye by influencing the size of the pupil?
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Answer
The correct answer is D, which is the Iris. The iris is responsible for controlling the size of the pupil, thereby regulating the amount of light that enters the eye.
Step 2
1.1.2 The function of the umbilical vein is to transport ...
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Answer
The correct answer is D, which states that the umbilical vein transports nutrients from the mother to the fetus. The umbilical vein plays a crucial role in supplying nutrients necessary for the fetus's development.
Step 3
1.1.3 Which ONE of the following represents gland X and hormone Y?
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Answer
The correct answer is C: Gland X is the Pancreas and Hormone Y is Insulin. Insulin is produced by the pancreas and plays a key role in regulating blood glucose levels.
Step 4
1.2.1 A reproductive strategy where the young receives nutrients through the placenta.
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Answer
The answer is Vivipary, which refers to a reproductive strategy where embryos develop inside the female parent's body and receive nutrients directly from the placenta.
Step 5
1.2.2 The duct that transports semen and urine to the outside of the body.
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Answer
The answer is Urethra, which is the duct that carries urine from the bladder and semen during ejaculation.
Step 6
1.2.3 The part of the nervous system that consists of cranial and spinal nerves.
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Answer
The answer is Peripheral nervous system, which is composed of nerves that branch out from the brain and spinal cord.
Step 7
1.2.4 The form in which excess glucose is stored in the liver.
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Answer
The answer is Glycogen, a stored form of glucose that can be readily converted to glucose when energy is needed.
Step 8
1.2.5 The structure that serves as a micro-filter during pregnancy.
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Answer
The answer is Placenta, which acts as a barrier and filter, supplying nutrients and oxygen to the fetus while removing waste products.
Step 9
1.2.6 The pigmented layer of the eye that absorbs excess light.
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Answer
The answer is Choroid, which contains dark pigments that help reduce light reflection and thus minimize glare.
Step 10
1.2.7 The part of a neuron that plays a role in the speed at which a nerve impulse is transmitted.
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Answer
The answer is Myelin sheath, which insulates the axon and allows for faster transmission of nerve impulses.
Step 11
1.2.8 The part of the male reproductive system which temporarily stores sperm until they mature.
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Answer
The answer is Epididymis, which is located at the back of the testis and is where sperm mature and are stored.
Step 12
1.4.1 Identify part:
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Answer
(a) The answer is B. (b) The answer is E.
Step 13
1.4.2 Give the LETTER and NAME of the part that: (a) is filled with air
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Answer
(a) The answer is D and the part is the Eustachian tube. (b) The answer is C and the part is the Cochlea.
Step 14
1.4.3 Give the LETTER of the part: (a) where grommets are inserted
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Answer
(a) The answer is F. (b) The answer is A.
Step 15
1.5.1 Identify structure: (a)
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Answer
(a) The answer is B. (b) The answer is D. (c) The answer is E.
Step 16
1.5.2 Name the: (a) Process taking place at A
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Answer
(a) The answer is Fertilisation. (b) The answer is Endometrium, which is the inner wall of the uterus where implantation occurs.
Step 17
1.5.3 State the type of cell division that takes place at C.
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Answer
The answer is Mitosis, which is the type of cell division resulting in two identical daughter cells.
Step 18
1.5.4 How many chromosomes are normally found in H?
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Answer
The answer is 23, which is the normal chromosome number for human gametes.
Step 19
1.5.5 Identify the extra-embryonic membrane G.
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Answer
The answer is Chorion, which is the outermost membrane surrounding the embryo and contributes to the formation of the placenta.
