NSC Life Sciences Genetics and Inheritance: 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) to match to the question numbers (1.1 to 1.8) in the ANSWER BOOK, e.g. 1.1 D.

1.1.1 Which of the following involves the development of the young inside the uterus of the mother and where it receives nutrients through the placenta?
A. Viviparity
B. Oviparity
C. Ovoviviparity
D. Acyclicity

1.1.2 Below is a list of terms relating to reproduction:
A. Prehistoric development
B. Asexual reproduction
C. External fertilization
D. Parental care

Which of the terms above refer to strategies used by birds that incubate their eggs in a nest and feed their young until they are able to fly?
A. a only
B. a and b only
C. b and c only
D. a, b and c only

1.1.3 Which part of the eye absorbs excess light?
A. Retina
B. Choroid
C. Lens
D. Cornea

1.1.4 Which ONE of the following activities will help to maintain biodiversity in a country?
A. Habitat destruction
B. Introducing alien plants
C. Pesticide use
D. Sustainable use of plant and animal resources

1.1.5 Give the correct biological term for each of the following descriptions. Write the term next to the question numbers (1.2.1 to 1.2.9) in the ANSWER BOOK.

1.2.1 Thin structure that provides information about the position of the head

1.2.2 A hormone that regulates water balance in the body

1.2.3 A flammable gas produced in landfills

1.2.4 The part of the brain that regulates breathing

1.2.5 The process of maintaining a constant internal environment in the human body

1.2.6 The membrane that, together with the endometrium, forms the placenta.

1.2.7 The structure in the head of a sperm containing digestive enzymes.

1.3 Indicate whether each of the statements in COLUMN I applies to A ONLY, B ONLY, BOTH A AND B or NONE of the items in COLUMN II. Write 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
1.3.1 Unfertilised eggs released from:
A. Sexual reproduction
B. External fertilization

1.3.2 Plant hormone that helps plants grow, e.g. in roots, shoots, tubers
A. Gibberellins
B. Auxins

1.3.3 Hormones secreted by the pituitary gland:
A. Prolactin
B. Growth hormone

1.4 The diagrams below show the response of the human eye to two different conditions.

Diagram 1

1.4.1 Identify part:
(a) A
(b) B
(c) C

1.4.2 Identify the process in Diagram 1.

1.4.3 Name the part of the eye that is responsible for the response in Diagram 1.

1.4.4 State the consequence to the person's vision if the process in Diagram 2 does not occur.

1.5 The diagram below represents an endocrine gland A and the events that take place in the ovary during the menstrual cycle in humans.

1.5.1 Identify:
(a) Gland A
(b) Structure B
(c) Process C
(d) Structure D

1.5.2 State the effect on the oestrogen levels in the blood if gland A stops secreting FSH.

1.5.3 State ONE function of LH.

1.6 A normal, healthy person was placed in a cold room. After 30 minutes the thermal image shown below was produced. This thermal image indicates the temperature of different parts of the body. Lighter colours on the scan indicate temperatures lower than normal body temperature.

1.6.1 Which colour, black, grey or white, represents the normal body temperature?

1.6.2 State what occurs in each of the following parts in this person's skin during temperature regulation:
(a) Blood vessels
(b) Sweat glands

1.6.3 Name the part of the brain that is responsible for thermoregulation.

1.6.4 State ONE way in which the thermal image would differ if the person was placed in a hot room for 30 minutes.

Various options are provided as possible answers to the following questions - NSC Life Sciences - Question 1 - 2019 - Paper 1

Worked Solution & Example Answer:Various options are provided as possible answers to the following questions - NSC Life Sciences - Question 1 - 2019 - Paper 1

1.1.1 Which of the following involves the development of the young inside the uterus of the mother and where it receives nutrients through the placenta?

1.1.2 Below is a list of terms relating to reproduction: Which of the terms above refer to strategies used by birds that incubate their eggs in a nest and feed their young until they are able to fly?

1.1.3 Which part of the eye absorbs excess light?

1.1.4 Which ONE of the following activities will help to maintain biodiversity in a country?

1.2.1 Thin structure that provides information about the position of the head

1.2.2 A hormone that regulates water balance in the body

1.2.3 A flammable gas produced in landfills

1.2.4 The part of the brain that regulates breathing

1.2.5 The process of maintaining a constant internal environment in the human body

1.2.6 The membrane that, together with the endometrium, forms the placenta.

1.2.7 The structure in the head of a sperm containing digestive enzymes.

1.3.1 Unfertilised eggs released from: A. Sexual reproduction B. External fertilization

1.3.2 Plant hormone that helps plants grow, e.g. in roots, shoots, tubers: A. Gibberellins B. Auxins

1.3.3 Hormones secreted by the pituitary gland: A. Prolactin B. Growth hormone

1.4.1 Identify part: (a) A (b) B (c) C