1.1 Various options are provided as possible answers to the following questions - NSC Life Sciences - Question 1 - 2022 - 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 to D in the ANSWER BOOK.
1.1.1 Which ... 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 - 2022 - Paper 1
Step 1
1.1.1 Which ONE of the following statements is CORRECT for oogenesis in humans?
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Answer
The correct statement is B: One haploid mature ovum is formed. In humans, oogenesis results in the formation of one functional egg cell (ovum) and three polar bodies that degenerate.
Step 2
1.1.2 A structure in the eye that contains a high concentration of blood vessels and provides oxygen and nutrients to the retina is the ...
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Answer
The correct answer is B: choroid. The choroid is the vascular layer of the eye that supplies blood to the outer layers of the retina.
Step 3
1.1.3 The vagina...
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The correct answer is D: acts as a birth canal. The vagina is the passage through which the baby is born during delivery.
Step 4
1.1.4 The list below gives the characteristics of some young birds immediately after hatching:
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The correct answer is A: (i) and (ii) only. This indicates that the young birds are precocial, with their eyes open and wings not fully developed.
Step 5
1.1.5 The cornea and the lens are both ...
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The correct answer is A: transparent. Both the cornea and lens are crucial for focusing light into the eye, thus must be clear.
Step 6
1.1.6 Which ONE of the following is TRUE for a person who has a low metabolic rate and a non-functional thyroid gland?
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The correct answer is A: Obese. A low metabolic rate often leads to weight gain and obesity.
Step 7
1.1.7 The diagram below represents a visual defect.
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Answer
The correct treatment for the visual defect is B: Glasses with biconcave lenses. This treatment is typically used for myopia (nearsightedness).
Step 8
1.1.8 A list of some components of the nervous system is provided below:
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The correct answer is A: (i), (ii) and (iv). These are all components of the central nervous system.
Step 9
1.1.9 Which ONE of the following is the part of the eye with the highest concentration of cones?
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The correct answer is C: Yellow spot. The yellow spot (fovea) is where the concentration of color-sensitive cones is the highest.
Step 10
1.2.1 A structure in the ear that absorbs excess pressure waves from the inner ear.
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Answer
The correct term is Round window. The round window helps to equalize pressure within the inner ear.
Step 11
1.2.2 The structure in a sperm that contains enzymes.
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The correct term is Acrosome. The acrosome contains enzymes that help the sperm to penetrate the egg.
Step 12
1.2.3 The site of fertilisation in the human female.
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The correct term is Fallopian tube. Fertilization typically occurs in the ampulla of the fallopian tube.
Step 13
1.2.4 A visual defect caused by the uneven curvature of the cornea.
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The correct term is Astigmatism. This condition results in blurred or distorted vision.
Step 14
1.2.5 The nerve that transmits impulses from the eye to the brain.
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The correct term is Optic nerve. The optic nerve carries visual information from the retina to the brain.
Step 15
1.2.6 A disease characterized by the degeneration of brain cells and memory loss.
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The correct term is Alzheimer's disease. It leads to progressive cognitive decline.
Step 16
1.2.7 The inner layer of the uterus that thickens during the menstrual cycle.
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The correct term is Endometrium. This layer prepares for potential implantation of an embryo.
Step 17
1.2.8 A hollow ball of cells that forms during embryonic development.
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The correct term is Blastula. The blastula stage is crucial in early embryonic development.
Step 18
1.2.9 The period of development of secondary sexual characteristics in humans.
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The correct term is Puberty. This is the stage of sexual maturation.
Step 19
1.2.10 The type of vision where both eyes are used to focus on an object.
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The correct term is Binocular vision. This allows for depth perception.
Step 20
1.3.1 The plant hormone that stimulates ...
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Answer
The correct description is A only. This hormone specifically stimulates plant growth.
Step 21
1.3.2 The part of the brain that connects ...
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Answer
The correct description is B only. This connects specific parts of the brain involved in various functions.
Step 22
1.3.3 The fluid that is found in front of the lens in the eye.
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Answer
The answer is Aqueous humor. This fluid helps to maintain intraocular pressure.
Step 23
1.4.1 Name the process that occurs when:
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Answer
(a) The process is Accommodation. This is the adjustment of the eye for seeing at different distances.
(b) The pupillary reflex is the mechanism that adjusts the size of the pupil in response to light.
Step 24
1.4.2 Give the LETTERS OF TWO diagrams (A, B or C) that represent the eye of a person whose:
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Answer
(a) The correct letters are B and D, indicating ciliary muscles contracted and enabling near vision.
(b) The correct letters are A' and B', indicating that radial muscles are relaxed for distant vision.
Step 25
1.5.1 Identify:
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Answer
(a) Layer E corresponds to the Myelin sheath. It insulates the nerve fibers and increases impulse speed.
(b) Structure F corresponds to a neuron, potentially a sensory neuron.
Step 26
1.5.2 Which neuron (A, B or C) represents the type of neuron shown in diagram 2?
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Answer
Neuron C represents the type shown in diagram 2, which is typically the motor neuron responsible for muscle contractions.
