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, B, C or D) next to the question numbers (1.1.1 to 1.1.10) in the ANSWER BOOK.

1.1.1 Diabetes mellitus is caused by an ...

1.1.2 Receptors that are sensitive to the low water levels in the blood are referred to as ...

1.1.3 The myelin sheath on a nerve cell ...

1.1.4 The structure where sperms are temporarily stored is the ...

1.1.5 Which ONE of the following is a function of the amniotic fluid?

QUESTIONS 1.1.6 AND 1.1.7 ARE BASED ON THE DIAGRAM OF THE BRAIN BELOW.

1.1.6 Which ONE of the following represents the corpus callosum?

1.1.7 Which ONE of the following is the function of part 3?

1.1.8 The placenta is formed by the ...

1.1.9 An overproduction of the hormone produced by the thyroid gland may result in a ...

1.1.10 The table below shows the average testosterone levels of males of different age groups.

Which ONE of the following is an explanation for the difference in testosterone levels between the age groups?

1.2 Give the correct biological term for each of the following descriptions:

1.2.1 The term relating to a constant internal environment in the human body.

1.2.2 The process characterised by the degeneration of brain tissue, leading to memory loss.

1.2.3 The layer in the eye that is richly supplied with blood vessels.

1.2.4 The type of development in birds in which the young is fully developed and able to move and feed itself.

1.2.5 Groups of cells in the pancreas that secrete insulin and glucagon.

1.2.6 A blood vessel that transports carbon dioxide from the fetus to the placenta.

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 in the ANSWER BOOK.

COLUMN I

1.3.1 An extra-embryonic membrane
1.3.2 Chorion
1.3.3 Absorption process that occurs in the uterus and helps protect the embryo from shock

COLUMN II

1.3.1 Amnion
1.3.2 Placentas
1.3.3 Absorption that occurs across the respiratory surface

1.4 The flow diagram below represents the components of the nervous system.

Nervous System

Central nervous system

Brain

Cranial nerves

Sympathetic

Identify the component of the nervous system represented by:

1.4.1 (a) A
(b) B

1.4.2 Name the type of nerves found at C.

1.4.3 Give the LETTER and NAME of the component that slows down the heart rate when an emergency situation has passed.

1.4.4 Name the nerve cells that make up nervous tissue.

1.4.5 State TWO ways in which the brain is protected.

1.5 The diagrams below show parts of the middle and inner ear.

1.5.1 Identify part F.

1.5.2 Give the collective term for bones B.

1.5.3 Give the LETTER and NAME of the structure that:

(a) Equalises pressure between the outer and middle ear
(b) Creates pressure waves in your ear

1.5.4 Name the receptors that are stimulated by a change in:

(a) Position of the head
(b) Direction and speed of movement of the head.

1.1 Various options are provided as possible answers to the following questions - NSC Life Sciences - Question 1 - 2023 - Paper 1

Worked Solution & Example Answer:1.1 Various options are provided as possible answers to the following questions - NSC Life Sciences - Question 1 - 2023 - Paper 1

1.1.1 Diabetes mellitus is caused by an ...

1.1.2 Receptors that are sensitive to the low water levels in the blood are referred to as ...

1.1.3 The myelin sheath on a nerve cell ...

1.1.4 The structure where sperms are temporarily stored is the ...

1.1.5 Which ONE of the following is a function of the amniotic fluid?

1.1.6 Which ONE of the following represents the corpus callosum?

1.1.7 Which ONE of the following is the function of part 3?

1.1.8 The placenta is formed by the ...

1.1.9 An overproduction of the hormone produced by the thyroid gland may result in a ...

1.1.10 Which ONE of the following is an explanation for the difference in testosterone levels between the age groups?

1.2.1 The term relating to a constant internal environment in the human body.

1.2.2 The process characterised by the degeneration of brain tissue, leading to memory loss.

1.2.3 The layer in the eye that is richly supplied with blood vessels.

1.2.4 The type of development in birds in which the young is fully developed and able to move and feed itself.

1.2.5 Groups of cells in the pancreas that secrete insulin and glucagon.

1.2.6 A blood vessel that transports carbon dioxide from the fetus to the placenta.

1.3.1 An extra-embryonic membrane

1.3.2 Chorion

1.3.3 Absorption process that occurs in the uterus and helps protect the embryo from shock

1.4.1 (a) A

(b) B

1.4.2 Name the type of nerves found at C.

1.4.3 Give the LETTER and NAME of the component that slows down the heart rate when an emergency situation has passed.

1.4.4 Name the nerve cells that make up nervous tissue.

1.4.5 State TWO ways in which the brain is protected.

1.5.1 Identify part F.

1.5.2 Give the collective term for bones B.

1.5.3 Give the LETTER and NAME of the structure that: (a) Equalises pressure between the outer and middle ear

(b) Creates pressure waves in your ear

1.5.4 Name the receptors that are stimulated by a change in: (a) Position of the head

(b) Direction and speed of movement of the head.

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