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 part that controls the amount of light entering the eye by influencing the size of the pupil is the Iris. The iris adjusts the diameter of the pupil, regulating light entry.
Step 2
1.1.2 The function of the umbilical vein is to transport …
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Answer
The umbilical vein primarily transports nutrients from the mother to the foetus. This blood is rich in oxygen and vital nutrients necessary for foetal development.
Step 3
1.1.3 Which ONE of the following represents gland X and hormone Y?
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In the context of blood glucose regulation, gland X is the Pancreas and hormone Y is Insulin. The pancreas secretes insulin when blood glucose levels rise, facilitating glucose uptake by cells.
Step 4
1.2.1 A reproductive strategy where the young receives nutrients through the placenta.
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Answer
The biological term for this strategy is Vivipary.
Step 5
1.2.2 The duct that transports semen and urine to the outside of the body.
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This duct is known as the Urethra.
Step 6
1.2.3 The part of the nervous system that consists of cranial and spinal nerves.
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This part is referred to as the Peripheral nervous system.
Step 7
1.2.4 The form in which excess glucose is stored in the liver.
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Excess glucose is stored in the liver as Glycogen.
Step 8
1.2.5 The structure that serves as a micro-filter during pregnancy.
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This structure is known as the Placenta.
Step 9
1.2.6 The pigmented layer of the eye that absorbs excess light.
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This layer is called the Choroid.
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
This part is known as the Myelin sheath.
Step 11
1.2.8 The part of the male reproductive system which temporarily stores sperm until they mature.
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Answer
This part is the Epididymis.
Step 12
1.4.1 Identify part:
(a) B
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Part B refers to the Semi-circular canals, which are involved in maintaining balance.
Step 13
1.4.1 Identify part:
(b) E
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Part E corresponds to the Eustachian tube, which equalizes pressure in the ear.
Step 14
1.4.2 Give the LETTER and NAME of the part that:
(a) is filled with air
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The part that is filled with air is the D which is the Eustachian tube.
Step 15
1.4.2 Give the LETTER and NAME of the part that:
(b) Contains the organ of Corti
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The part containing the organ of Corti is the C which is the Cochlea.
Step 16
1.4.3 Give the LETTER of the part:
(a) Where grommets are inserted
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The part where grommets are inserted is marked as F.
Step 17
1.4.3 Give the LETTER of the part:
(b) That amplifies vibrations
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The part that amplifies vibrations is identified as A.
Step 18
1.5.1 Identify structure:
(a) B
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Structure B is identified as the Zygote.
Step 19
1.5.1 Identify structure:
(b) D
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Structure D is identified as the Morula.
Step 20
1.5.1 Identify structure:
(c) E
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Structure E is identified as the Blastocyst.
Step 21
1.5.2 Name the:
(a) Process taking place at A
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The process taking place at A is called Fertilisation.
Step 22
1.5.2 Name the:
(b) Inner wall of the uterus where structure E implants
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The inner wall of the uterus where structure E implants is known as the Endometrium.
Step 23
1.5.3 State the type of cell division that takes place at C.
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The type of cell division that takes place at C is Mitosis.
Step 24
1.5.4 How many chromosomes are normally found in H?
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Normally, 23 chromosomes are found in structure H.
Step 25
1.5.5 Identify the extra-embryonic membrane G.
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The extra-embryonic membrane G is called the Chorion.
