1.1 Various options are provided as possible answers to the following question - NSC Life Sciences - Question 1 - 2017 - Paper 1
Question 1
1.1 Various options are provided as possible answers to the following question. Write down the question number (1.1.1-1.10), choose the answer and make a cross (X) o... show full transcript
Worked Solution & Example Answer:1.1 Various options are provided as possible answers to the following question - NSC Life Sciences - Question 1 - 2017 - Paper 1
Step 1
Monoculture refers to farming with …
96%
114 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
C. Only one type of crop. Monoculture is defined as the agricultural practice of cultivating a single crop in a given area, which contrasts with polyculture where multiple crops are grown.
Step 2
The part of a sperm cell that contains enzymes to digest the membrane of the ovum is the …
99%
104 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
D. Acrosome. The acrosome is a specialized structure that contains enzymes necessary for the sperm to penetrate the ovum.
Step 3
Where are sperm cells in humans temporarily stored?
96%
101 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
B. Epididymis. The epididymis serves as a storage space for immature sperm cells as they mature.
Step 4
Poaching refers to …
98%
120 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
B. Illegal hunting of alien plants. Poaching typically refers to the illegal capture or killing of wildlife or plants.
Step 5
The part of the male reproductive system where meiosis takes place is …
97%
117 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
A. Seminiferous tubules. Meiosis occurs in the seminiferous tubules within the testes, where sperm cells develop.
Step 6
A scientist wants to investigate the influence of nitrogen-containing fertilizers on the pH of soil. To make her investigation more reliable she should …
97%
121 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
D. Use different samples of soil and potassium-containing fertilizers in each sample. This ensures a controlled and comprehensive approach to assess the impact of different fertilizers.
Step 7
A municipality is planning the development of a new landfill site for a town. Some of the factors that need to be taken into consideration when designing landfill site are:
96%
114 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
D. (i), (ii) and (iv) only. This combination ensures that environmental protection and regulatory requirements are addressed.
Step 8
A cancerous tumour in the pituitary gland/hypothysis causes an overproduction of TSH in a patient. One of the effects observed on the patient is that his weight …
99%
104 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
C. Decreases because metabolic rate increases. An increased metabolic rate can lead to weight loss, regardless of diet.
Step 9
A function of amniotic fluid is …
96%
101 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
B. To provide a shock absorber to protect the fetus. Amniotic fluid serves as a cushion, protecting the developing fetus from physical shocks.
Step 10
The part of the male reproductive system that connects the epididymis with the urethra is …
98%
120 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
D. The tube in the male reproductive system that connects the epididymis with the urethra. This tube is known as the vas deferens.
Step 11
The variety of plant and animal species on earth
97%
117 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
Biodiversity. Biodiversity encompasses the range of different species and ecosystems present on our planet.
Step 12
Measurement of the total amount of carbon dioxide emissions of an individual per year
97%
121 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
Carbon footprint. The carbon footprint quantifies the net amount of carbon dioxide produced directly and indirectly by an individual.
Step 13
The type of pollution caused when water is released into a river or the sea after being heated in power stations or industries
96%
114 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
Thermal pollution. This form of pollution occurs when water used for cooling processes is discharged at a higher temperature, affecting aquatic life.
Step 14
The accumulation of nutrients in ponds from the over-use of fertilizers on land, stimulating excessive growth of algae
99%
104 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
Eutrophication. Eutrophication leads to nutrient overload, causing algal blooms that can deplete oxygen in water bodies.
Step 15
A hormone that stimulates the maturation of sperm and puberty in males
96%
101 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
Testosterone. Testosterone is the primary male sex hormone responsible for developing male characteristics and reproductive functions.
Step 16
The tube in the male reproductive system that connects the epididymis with the urethra
98%
120 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
Vas deferens. This is the duct that transports sperm from the epididymis to the urethra.
Step 17
The hormone which regulates the salt balance in humans
97%
117 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
Aldosterone. Aldosterone plays a crucial role in regulating sodium and potassium levels, thus affecting blood pressure.
Step 18
The hormone that stimulates the mammary glands to secrete milk
97%
121 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
Prolactin. Prolactin is essential for milk production in the breasts following childbirth.
Step 19
The division of the cytoplasm through the constriction of the membrane at the end of cell division.
96%
114 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
Cytokinesis. Cytokinesis is the final step in cell division, where the cytoplasm divides, resulting in two daughter cells.
Step 20
Indicate whether each of the descriptions in COLUMN A applies to A ONLY, B ONLY or BOTH A and B.
99%
104 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
A only. This indicates that only description A applies to that specific context.
Step 21
Give the LETTER and NAME of the part that:
(a) Controls one-directional transmission of impulses
96%
101 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
(a) D. Synapse. The synapse is the junction between two neurons that allows for the one-directional flow of information.
Step 22
(b) Transmits impulses from the sensory neuron to the connector motor neuron
98%
120 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
(b) C. Interneuron/Connector neuron. This is the neuron that relays signals between sensory and motor neurons.
Step 23
(c) Transmits impulses from the connector motor neuron to the effector
97%
117 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
(c) A. Dendrite. The dendrite receives signals from the connector neuron, transmitting them to the effector.
Step 24
Study the diagram below of the sequence of events that takes place from the fertilisation of the ovum to the development of the embryo in a part of the human female reproductive system.
97%
121 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
(a) Zygote. The zygote is the earliest developmental stage after fertilisation. (b) Morula. The morula is a solid ball of cells resulting from division after fertilisation.
Step 25
(b) Morula
96%
114 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
(b) Morula. Following fertilization, the zygote undergoes several divisions to form the morula.
Step 26
Give the chromosome number:
99%
104 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
(a) Cells at D: 46/23 pairs. Human cells generally contain 46 chromosomes, arranged in 23 pairs. (b) Cell A: 23. Cell A represents a haploid cell, containing half the number of chromosomes, typical of gametes.
