NSC Life Sciences DNA: The Code of Life: 1.1 Various options are provided

Question

1.1 Various options are provided as possible answers to the following question. Write down the question number (1.1.1-1.1.10), choose the 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 damaged.
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 that prepares the human body for an emergency situation is …
A. thyroxine.
B. adrenaline.
C. insulin.
D. testosterone.

1.1.6 A function of amino acid is to …
A. serve as a micro-filter preventing germs from entering the body.
B. act as a shock absorber to protect the fetus.
C. provide insulation to keep the body warm and help temperature.
D. serve as a medium for the sperm to swim in.

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

1.1.8 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.

1.1.9 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:
(i) The site should be lined with an impervious layer.
(ii) The site should be located far from water.
(iii) The site should be covered with soil daily.
(iv) All relocated species must be removed and relocated.
Which ONE of the following combinations is aimed at protecting the environment from pollution?
A. (i), (ii), (iii) and (iv) only
B. (i) and (iv) only
C. (ii) and (iii) only
D. (i), (ii) and (iii) only.

1.1.10 A cancerous tumor in the pituitary gland/hypophysis causes an increased production of TSH in a patient. One of the effects that this has on the patient is that his weight …
A. increases because metabolic rate increases.
B. decreases because metabolic rate is not affected.
C. increases because metabolic rate decreases.
D. decreases because metabolic rate decreases.

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 introduced 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 applies to A ONLY, B ONLY, BOTH A and B:

1.3.1 A only
1.3.2 B only
1.3.3 Both A and 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 neuron to the muscle effector but cannot react to the stimulus

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:
(a) In the cells at D
(b) Cell A

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

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

Monoculture refers to farming with …

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

Where are sperm cells in humans temporarily stored?

Poaching refers to …

The part that prepares the human body for an emergency situation is …

A function of amino acid is to …

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

To make her investigation more reliable she should …

Which ONE of the following combinations is aimed at protecting the environment from pollution?

A cancerous tumor in the pituitary gland/hypophysis causes an increased production of TSH in a patient. One of the effects that this has on the patient is that his weight …

The variety of plant and animal species on earth

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

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

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

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

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

The hormone which regulates the salt balance in humans

The hormone that stimulates the mammary glands to secrete milk

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

Indicate whether each of the descriptions in COLUMN A applies to A ONLY, B ONLY, BOTH A and B:

Controls one-directional transmission of impulses

Transmits impulses from the sensory neuron to the connector motor neuron

Transmits impulses from the connector neuron to the muscle effector but cannot react to the stimulus

Identify:

The stage of embryo development at E

The structure that develops from a combination of parts F and H

Name the process that takes place:

Give the chromosome number:

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