NSC Life Sciences Genetics and Inheritance: Various options are provided as

Question

Various options are provided as possible answers to the following question. Write down the question number (1.1.1-1.1.10) choose one answer and make a cross (X) over the letter (A-D) of your choice in the ANSWER BOOK.

1.1.1 Monoculture refers to farming with …
A. a different crop every year.
B. one type of irrigation.
C. only one type of crop.
D. plants and livestock on the same farm.

1.1.2 The part of a sperm cell that contains enzymes to digest the membrane of the ovum is the …
A. tail.
B. mid-piece.
C. nucleus.
D. acrosome.

1.1.3 Where are sperm cells in humans temporarily stored?
A. Vas deferens
B. Epididymis
C. Urethra
D. Prostate gland

1.1.4 Poaching refers to …
A. a relocation of organisms to a new habitat when the old habitat is destroyed.
B. the introduction of alien plants.
C. the use of chemicals to kill pests.
D. the removal of organisms from their habitat.

1.1.5 The part of the male reproductive system where meiosis takes place is the …
A. seminiferous tubules.
B. seminal vesicles.
C. urethra.
D. epididymis.

1.1.6 A scientist wants to investigate the influence of nitrogen-containing fertilizers on the pH of soil.
To make her investigation more reliable she should …
A. use potassium-containing fertilizers on many soil samples.
B. use nitrogen-containing fertilizers on many soil samples.
C. test the effect of nitrogen-containing fertilizers on clay soils only.
D. use different samples of soil and potassium-containing fertilizers in each sample.

1.1.7 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 developing this landfill site are:
(i) The site should be lined with an impermeable layer.
(ii) The site should be located far from rivers.
(iii) The site should be covered with soil daily.
(iv) The site must have adequate waste removal and relocation.
Which ONE of the following combinations is aimed at protecting the environment from pollution?
A. (i) and (ii) only
B. (iii) and (iv) only
C. (ii), (iii) and (iv) only
D. (i) and (iv) only

1.1.8 A cancerous tumour in the pituitary gland/hypothysis causes an increase in production of TSH in a patient. One of the effects observed on the patient is that his weight …
A. increases only.
B. stays the same as the rate is not affected.
C. increases because metabolic rate decreases.
D. decreases because metabolic rate decreases.

1.1.9 A function of amniotic fluid is to …
A. serve as a micro-filter preventing germs from entering the womb.
B. protect the developing embryo when the body temperature …
C. provide nutrients to the developing embryo.
D. serve as a medium for the sperm to swim in.

1.1.10 The part of the male reproductive system that connects the epididymis with the urethra is …
A. the tube.
B. the hormone which regulates the salt balance in humans.
C. testosterone.
D. the hormone that stimulates the mammary glands to secrete milk.

1.2 Give the correct term for each of the following descriptions. Write only the term next to the question number (1.2.1 to 1.2.9) in the ANSWER BOOK.

1.2.1 The variety of plant and animal species on earth
1.2.2 Measurement of the total amount of carbon dioxide emissions of an individual per year
1.2.3 The type of pollution caused when water is released into a river or the sea after being heated in power stations or industries
1.2.4 The accumulation of nutrients in ponds from the over-use of fertilizers on land, stimulating excessive growth of algae
1.2.5 A hormone that stimulates the maturation of sperm and puberty in males
1.2.6 The tube in the male reproductive system that connects the epididymis with the urethra
1.2.7 The hormone which regulates the salt balance in humans
1.2.8 The hormone that stimulates the mammary glands to secrete milk
1.2.9 The division of the cytoplasm through the constriction of the membrane at the end of cell division

1.3 Indicate whether each of the descriptions in COLUMN A refers to A ONLY, B ONLY or BOTH A and B.

The diagram below represents a reflex arc.
A. B.

1.4 Give the LETTER and NAME of the part that:
(a) Controls one-directional transmission of impulses.
(b) Transmits impulses from the sensory neuron to the connector motor neuron.
(c) Transmits impulses from the connector motor neuron to the effector.

1.5 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.

1.5.1 Identify:
(a) Structure C
(b) The stage of embryo development at E
(c) The structure that develops from a combination of parts F and H

1.5.2 Name the process that takes place:
(a) At B
(b) When G attaches to part F

1.5.3 Give the chromosome number:
Cell at D
Cell A

Various options are provided as possible answers to the following question - NSC Life Sciences - Question 1 - 2017 - Paper 1

Worked Solution & Example Answer:Various options are provided as possible answers to the following question - NSC Life Sciences - Question 1 - 2017 - Paper 1

1.1.1 Monoculture refers to farming with …

1.1.2 The part of a sperm cell that contains enzymes to digest the membrane of the ovum is the …

1.1.3 Where are sperm cells in humans temporarily stored?

1.1.4 Poaching refers to …

1.1.5 The part of the male reproductive system where meiosis takes place is the …

1.1.6 A scientist wants to investigate the influence of nitrogen-containing fertilizers on the pH of soil. To make her investigation more reliable she should …

1.1.8 A cancerous tumour in the pituitary gland/hypothysis causes an increase in production of TSH in a patient. One of the effects observed on the patient is that his weight …

1.1.9 A function of amniotic fluid is to …

1.1.10 The part of the male reproductive system that connects the epididymis with the urethra is …

1.2.1 The variety of plant and animal species on earth

1.2.2 Measurement of the total amount of carbon dioxide emissions of an individual per year

1.2.3 The type of pollution caused when water is released into a river or the sea after being heated in power stations or industries

1.2.4 The accumulation of nutrients in ponds from the over-use of fertilizers on land, stimulating excessive growth of algae

1.2.5 A hormone that stimulates the maturation of sperm and puberty in males

1.2.6 The tube in the male reproductive system that connects the epididymis with the urethra

1.2.7 The hormone which regulates the salt balance in humans

1.2.8 The hormone that stimulates the mammary glands to secrete milk

1.2.9 The division of the cytoplasm through the constriction of the membrane at the end of cell division

1.3.1 Indicate whether each of the descriptions in COLUMN A refers to A ONLY, B ONLY or BOTH A and B.

1.4 (a) Controls one-directional transmission of impulses.

1.4 (b) Transmits impulses from the sensory neuron to the connector motor neuron.

1.4 (c) Transmits impulses from the connector motor neuron to the effector.

1.5.1 (a) Identify: Structure C

1.5.1 (b) The stage of embryo development at E

1.5.1 (c) The structure that develops from a combination of parts F and H

1.5.2 Name the process that takes place: (a) At B

1.5.2 Name the process that takes place: (b) When G attaches to part F

1.5.3 Give the chromosome number: Cell at D

1.5.3 Give the chromosome number: Cell A

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