NSC Life Sciences Receptors: 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 number (1.1.1 to 1.1.10) in the ANSWER BOOK.

1.1.1 The microscopic space between two adjacent neurons is a/an
A. axon.
B. dendrite.
C. synapse.
D. cell body.

1.1.2 The following is a list of functions performed by different organs in an organism:
(i) Protection
(ii) Gaseous exchange
(iii) Nutrition
(iv) Excretion

Which ONE of the following combinations refers to the functions performed by parts of an amniotic egg?
A. (i), (ii) and (ii) only
B. (ii), (iii) and (iv) only
C. (ii), (iii) and (iv) only
D. (i), (ii), (iii) and (iv)

1.1.3 An investigation was done to determine the effect of alcohol on the reaction time of a person.

Reaction time was measured by the time it took to catch a ruler.

The procedure was as follows:

The person's reaction time was first measured in a room with bright light.

Then the person was given 200 ml of alcohol and waited for 15 minutes. The reaction time of the person was measured for the second time while he/she was in a room with dim light.

Ten measurements were recorded each time and an average was calculated.

How was the validity of the investigation decreased?
A. The person's reaction time was measured in the absence of alcohol the first time.
B. Reaction time was measured by the time it took to catch a ruler.
C. Reaction time was measured in different light conditions.
D. Only ten measurements were recorded.

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 A type of reproduction in humans where the foetus develops inside the uterus
1.2.2 Structures found only in animal cells that form the spindle during cell division
1.2.3 The movement of part of a plant in response to gravity
1.2.4 The amount of carbon dioxide produced by an individual per unit time as a result of his/her activities
1.2.5 The stage in humans when sexual maturity is reached in males and females
1.2.6 A change in the internal or external environment that will be detected by a receptor and converted into an impulse
1.2.7 Small tubes placed in the tympanic membrane to drain liquid from the middle ear
1.2.8 Part of the human ear that directs sound waves into the auditory canal

1.3 Indicate whether each of the statements in COLUMN I applies to A ONLY, B ONLY, C ONLY, or D ONLY.

1.4 The diagram below represents a part of the male reproductive system.

(a) Give the LETTER and the NAME of the part that:
(i) is used in copulation
(ii) produces testosterone
(b) Give ONLY the LETTERS of the TWO parts in the diagram that:
(i) contribute to the formation of semen
(ii) provide a passage for the sperm cells

1.5 The diagram below shows a reflex arc.

(a) Give ONLY the LETTER of the part that represents the:
(i) Effector
(ii) Interneuron/Connector neuron
(iii) Sensory neuron
(b) Give the LETTER and NAME of the neuron in the diagram that is probably damaged if a person is able to detect the stimulus, but cannot respond.
(c) State if the nerve impulse travels from D to E or from E to D.

Various options are provided as possible answers to the following questions - NSC Life Sciences - Question 1 - 2016 - Paper 1

Worked Solution & Example Answer:Various options are provided as possible answers to the following questions - NSC Life Sciences - Question 1 - 2016 - Paper 1

1.1.1 The microscopic space between two adjacent neurons is a/an

1.1.2 Which ONE of the following combinations refers to the functions performed by parts of an amniotic egg?

1.1.3 How was the validity of the investigation decreased?

1.2.1 A type of reproduction in humans where the foetus develops inside the uterus

1.2.2 Structures found only in animal cells that form the spindle during cell division

1.2.3 The movement of part of a plant in response to gravity

1.2.4 The amount of carbon dioxide produced by an individual per unit time as a result of his/her activities

1.2.5 The stage in humans when sexual maturity is reached in males and females

1.2.6 A change in the internal or external environment that will be detected by a receptor and converted into an impulse

1.2.7 Small tubes placed in the tympanic membrane to drain liquid from the middle ear

1.2.8 Part of the human ear that directs sound waves into the auditory canal

1.4.1 (a) Give the LETTER and NAME of the part that: (i) is used in copulation

1.4.1 (a) Give the LETTER and NAME of the part that: (ii) produces testosterone

1.4.2 Give ONLY the LETTERS of the TWO parts in the diagram that: (i) contribute to the formation of semen

1.4.2 Give ONLY the LETTERS of the TWO parts in the diagram that: (ii) provide a passage for the sperm cells

1.5.1 (a) Give ONLY the LETTER of the part that represents the: (i) Effector

1.5.1 (a) Give ONLY the LETTER of the part that represents the: (ii) Interneuron/Connector neuron

1.5.1 (a) Give ONLY the LETTER of the part that represents the: (iii) Sensory neuron

1.5.2 Give the LETTER and NAME of the neuron in the diagram that is probably damaged if a person is able to detect the stimulus, but cannot respond.

1.5.2 (c) State if the nerve impulse travels from D to E or from E to D.

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