NSC Life Sciences Responding to the Environment: Humans: Various options are provided as

Question

Various options are provided as possible answers to the following questions. Choose the answer and write only the letter (A to D) next to the question numbers (1.1.1 to 1.1.9) in the ANSWER BOOK.

1.1.1 Grommets are used in the treatment of …
A deafness.
B blindness.
C middle-ear infection.
D multiple sclerosis.

1.1.2 The ability of the lens of the eye to change its shape when viewing an object that is near or far is called …
A binocular vision.
B accommodation.
C pupillary mechanism.
D refraction of light rays.

1.1.3 Which ONE of the following is the visual defect that results from the uneven curvature of the cornea?
A Cataracts.
B Long-sightedness.
C Short-sightedness.
D Astigmatism.

1.1.4 The receptor(s) involved in maintaining balance is/are the …
A organ of Corti only.
B macula only.
C macula and cristae.
D Eustachian tube and cerebellum.

1.1.5 The following structures are involved in maintaining balance when there is a change in the direction of movement of the body?
A Semi-circular canals and cerebellum.
B macula only.
C organ of Corti, macula and cristae.
D Eustachian tube and cerebellum.

1.2 Give the correct biological term for each of the following descriptions. Write only the term next to the question number (1.2.1 to 1.2.8) in the ANSWER BOOK.
1.2.1 The release of an ovum from the ovary.
1.2.2 The microscopic gap between two consecutive neurons.
1.2.3 The period of development of the foetus in the uterus.
1.2.4 The growth movement of a plant in response to a stimulus.
1.2.5 The type of development in birds where the young are able to independently move and feed themselves after hatching.
1.2.6 The extra-embryonic membrane that is responsible for the excretion of waste in an amniotic egg.
1.2.7 Tubules in the testes where spermatogenesis occurs.
1.2.8 The plant hormone that brings about seed dormancy when conditions are unfavorable.

1.3 Indicate whether each of the descriptions in COLUMN I apply to A ONLY, B ONLY, BOTH A AND B or NONE of the items in COLUMN II. Write only A only, B only, both A and B or none next to the question numbers (1.3.1 to 1.3.3) in the ANSWER BOOK.
COLUMN I          COLUMN II
1.3.1 An exocrine gland   A Cowper’s gland
1.3.2 A component of peripheral nervous system  B Pancreas
1.3.3 A degenerative disease characterised by the degeneration of brain cells  A Spinal cord

1.4 The diagram below shows the parts of the male reproductive system.

Identify part:
(a) C
(b) F
(c) H

Give the LETTER and NAME of the part that:
(a) Stores sperm temporarily.
(b) Transports both semen and urine.
(c) Produces testosterone.

Give the LETTERS of TWO parts that contribute to the formation of semen.

1.5 The diagram below represents an ovum and a sperm.
Identify part:
(a) B
(b) D
(c) H

Name the organelle found in large numbers in part G.

Give the LETTERS of the TWO parts that fuse during fertilisation.

Name the meiotic process whereby ovum are produced.

Various options are provided as possible answers to the following questions - NSC Life Sciences - Question 1 - 2021 - Paper 1

Worked Solution & Example Answer:Various options are provided as possible answers to the following questions - NSC Life Sciences - Question 1 - 2021 - Paper 1

1.2.1 The release of an ovum from the ovary.

1.2.2 The microscopic gap between two consecutive neurons.

1.2.3 The period of development of the foetus in the uterus.

1.2.4 The growth movement of a plant in response to a stimulus.

1.2.5 The type of development in birds where the young are able to independently move and feed themselves after hatching.

1.2.6 The extra-embryonic membrane that is responsible for the excretion of waste in an amniotic egg.

1.2.7 Tubules in the testes where spermatogenesis occurs.

1.2.8 The plant hormone that brings about seed dormancy when conditions are unfavorable.

1.3.1 An exocrine gland.

1.3.2 A component of peripheral nervous system.

1.3.3 A degenerative disease characterised by the degeneration of brain cells.

1.4.1 (a) C

1.4.1 (b) F

1.4.1 (c) H

1.4.2 (a)

1.4.2 (b)

1.4.2 (c)

1.4.3 Give the LETTERS of TWO parts that contribute to the formation of semen.

1.5.1 Identify part (a) B.

1.5.1 (b) D.

1.5.1 (c) H.

1.5.2 Name the organelle found in large numbers in part G.

1.5.3 Give the LETTERS of the TWO parts that fuse during fertilisation.

1.5.4 Name the meiotic process whereby ovum are produced.

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