NSC Life Sciences Receptors: 1.1 Various options are provided

Question

1.1 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 1.1.10) in the ANSWER BOOK, e.g. 1.1.1 D.

1.1.1 Which part controls the amount of light entering the eye?
A. Cornea
B. Iris
C. Choroid
D. Lens

1.1.2 Which ONE of the following refers to an aquifer?
A. An increase in the temperature of water bodies as a result of water from industries
B. Planting of the same crop on the same area repeatedly
C. An underground permeable rock saturated with water
D. The release of water with chemicals from mines

1.1.3 The structure in the amniotic egg that removes waste products:
A. Yolk sac
B. Chorion
C. Amnion
D. Allantois

1.1.4 Which ONE of the following is CORRECT with regard to phototropism?
A. Light cannot pass through the cone
B. Light cannot pass through the lens
C. The plant bends toward the light
D. The lenses cannot be removed from the eye

1.1.5 Which structures secrete progesterone during pregnancy?
A. Adrenal gland and corpus luteum
B. Corpus luteum and placenta
C. Thyroid gland and Graafian follicle
D. Pituitary gland and Graafian follicle

1.2 Give the correct biological term for each of the following descriptions. Write only the term next to the question numbers (1.2.1 to 1.2.10) in the ANSWER BOOK.

1.2.1 The layer in the atmosphere that protects living organisms from the ultraviolet rays of the sun

1.2.2 The illegal hunting and killing of animals

1.2.3 A condition of the cell where there is only one set of chromosomes

1.2.4 The response of a part of a plant to a light stimulus

1.2.5 A hormone that stimulates ovulation in humans

1.2.6 The part of the brain that connects the left and right hemispheres

1.2.7 The blood vessel that transports deoxygenated blood from the fetus towards the placenta

1.2.8 A small device that is inserted in the ear to drain fluids caused by a middle-ear infection

1.2.9 The branch of the autonomic nervous system that conserves energy and restores the body to a resting state

1.2.10 A structure in the eye that absorbs light to prevent internal reflection

1.4 The diagrams below show structures formed during human reproduction.

1.4.1 Identify part A.

1.4.2 Name the organelle found in large numbers in part C.

1.4.3 Give the NUMBER (1, 2, 3 or 4) only of the diagram that represents the following:
(a) Morula.
(b) Structure that will implant in the uterus.
(c) Blastula/Blastocyst.

1.4.4 Give the LETTER and NAME of the part that will enter the ovum during fertilisation.

1.4.5 NAME the type of cell division that occurs to produce the structure in diagram 3.

1.5 The diagrams below show different neurons.

1.5.1 Give only the NUMBERS (1, 2, 3 or 4) of TWO neurons that:
(a) Transport impulses from the receptor to the central nervous system.
(b) Will have a faster transmission of impulses.
(c) Are damaged if a person can feel the stimulus but is unable to react.

1.1 Various options are provided as possible answers to the following questions - NSC Life Sciences - Question 1 - 2020 - Paper 1

Worked Solution & Example Answer:1.1 Various options are provided as possible answers to the following questions - NSC Life Sciences - Question 1 - 2020 - Paper 1

Which part controls the amount of light entering the eye?

Which ONE of the following refers to an aquifer?

The structure in the amniotic egg that removes waste products:

Which ONE of the following is CORRECT with regard to phototropism?

Which structures secrete progesterone during pregnancy?

The layer in the atmosphere that protects living organisms from the ultraviolet rays of the sun

The illegal hunting and killing of animals

A condition of the cell where there is only one set of chromosomes

The response of a part of a plant to a light stimulus

A hormone that stimulates ovulation in humans

The part of the brain that connects the left and right hemispheres

The blood vessel that transports deoxygenated blood from the fetus towards the placenta

A small device that is inserted in the ear to drain fluids caused by a middle-ear infection

The branch of the autonomic nervous system that conserves energy and restores the body to a resting state

A structure in the eye that absorbs light to prevent internal reflection

Identify part A.

Name the organelle found in large numbers in part C.

Give the NUMBER (1, 2, 3 or 4) only of the diagram that represents the following: (a) Morula.

Give the NUMBER (1, 2, 3 or 4) only of the diagram that represents the following: (b) Structure that will implant in the uterus.

Give the NUMBER (1, 2, 3 or 4) only of the diagram that represents the following: (c) Blastula/Blastocyst.

Give the LETTER and NAME of the part that will enter the ovum during fertilisation.

NAME the type of cell division that occurs to produce the structure in diagram 3.

Give only the NUMBERS (1, 2, 3 or 4) of TWO neurons that: (1) Transport impulses from the receptor to the central nervous system.

Give only the NUMBERS (1, 2, 3 or 4) of TWO neurons that: (2) Will have a faster transmission of impulses.

Give only the NUMBERS (1, 2, 3 or 4) of TWO neurons that: (3) Are damaged if a person can feel the stimulus but is unable to react.

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