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

Question

Various options are provided as possible answers to the following questions. Choose the correct answer and write only the letter (A–D) next to the question numbers (1.1.1–1.1.19) in the ANSWER BOOK, for example 1.1.1D.

1.1.1 The monomers of proteins are ...
A amino acids.
B nucleotides.
C glucose.
D fatty acids.

1.1.2 When blood sugar level rises in the human body, the pancreas responds by secreting ...
A glycogen.
B glucagon.
C adrenalin.
D insulin.

1.1.3 Nerve cells that transmit impulses to the brain and spinal cord, are called ...
A motor neurons.
B reflex arcs.
C sensory neurons.
D efferent neurons.

1.1.4 The physiological connection between the axon of one neuron and the dendrite of another is a/the ...
A ganglion.
B synapse.
C capillary network.
D cell body.

1.1.5 The plant hormone that brings about elongation of internodes of stem is ...
A auxins.
B abscisic acid.
C gibberellins.
D acetic acid.

1.1.6 The diagram below shows the offspring which result from the mating of a black and white rabbit. The allele for black fur is dominant over the allele for white fur. The percentage of heterozygous offspring produced in this generation would be ...
A 25
B 100
C 50
D 75

1.1.7 Malfunctioning of which endocrine gland causes the disorder shown in the picture below?
A Adrenal gland.
B Pituitary gland.
C Pancreas.
D Thyroid gland.

1.1.8 The autonomic nervous system ...
A shuts down homeostasis.
B consists of sympathetic and para-sympathetic systems.
C controls voluntary activities.
D functions independently of the central nervous system.

(9 x 2) (18)

2 Give the correct biological term for each of the following descriptions. Write only the term next to the question number (1.2.1–1.2.7) in ANSWER BOOK.

1.2.1 A disorder of the eye which occurs when the lens becomes opaque and cloudy resulting in partial or no vision

1.2.2 Receptors for balance found within the ampulla of the semi-circular canals

1.2.3 Alternate forms of a gene that control the same characteristic but in different ways

1.2.4 Undifferentiated embryonic cells with a potential to become any tissue or organ in the body

1.2.5 Hormone responsible for apical dominance in plants

1.2.6 Gland that secretes FSH and LH in females

1.2.7 The cells that secrete testosterone in males
(7 x 1) (7)

3 Indicate whether each of the statements in COLUMN A applies to A ONLY, B ONLY, BOTH A AND B, or NONE of the items in COLUMN B. Write A only, B only, both A and B, or none next to the question number (1.3.1–1.3.6) in ANSWER BOOK.

COLUMN A
1.3.1 An inheritance in which none of the alleles is dominant.
1.3.2 A growth movement in response to light.
1.3.3 Sex-linked disorder.
1.3.4 A method of reproduction in which eggs are laid and development of the young takes place outside the mother’s body.
1.3.5 Stores waste produced by the embryo.
1.3.6 Corrective measure for myopia (short sightedness).

COLUMN B
A Co-dominance
B Geotropism
C Phototropism
D Down syndrome
E Vivipary
F Chorion
G Allantois
H Sickled cell anaemia
I Concave lens
J Convex lens
(6 x 2) (12)

1.4 A male rabbit with the genotype GgBb is crossed with a female rabbit with the genotype ggBb. The Punnet square is set up below:

|       | Gb    | g     | b     | b     |
|-------|-------|-------|-------|-------|
| G     | GbBb  | GgBb  | GbBb  | GgBb  |
| g     | gBb   | ggBb  | gBb   | ggBb  |

How many of the 16 offspring are:

(a) Grey hair with red eyes …
(b) White hair with black eyes …
(c) White hair with red eyes …
(d) Grey hair with black eyes …

(8 x 2) (4)

1.5 1.5.1  ... increases ...

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 monomers of proteins are ...

1.1.2 When blood sugar level rises in the human body, the pancreas responds by secreting ...

1.1.3 Nerve cells that transmit impulses to the brain and spinal cord, are called ...

1.1.4 The physiological connection between the axon of one neuron and the dendrite of another is a/the ...

1.1.5 The plant hormone that brings about elongation of internodes of stem is ...

1.1.6 The percentage of heterozygous offspring produced in this generation would be ...

1.1.7 Malfunctioning of which endocrine gland causes the disorder shown in the picture below?

1.1.8 The autonomic nervous system ...

1.2.1 A disorder of the eye which occurs when the lens becomes opaque and cloudy resulting in partial or no vision

1.2.2 Receptors for balance found within the ampulla of the semi-circular canals

1.2.3 Alternate forms of a gene that control the same characteristic but in different ways

1.2.4 Undifferentiated embryonic cells with a potential to become any tissue or organ in the body

1.2.5 Hormone responsible for apical dominance in plants

1.2.6 Gland that secretes FSH and LH in females

1.2.7 The cells that secrete testosterone in males

1.3.1 An inheritance in which none of the alleles is dominant.

1.3.2 A growth movement in response to light.

1.3.3 Sex-linked disorder.

1.3.4 A method of reproduction in which eggs are laid and development of the young takes place outside the mother’s body.

1.3.5 Stores waste produced by the embryo.

1.3.6 Corrective measure for myopia (short sightedness).

1.4(a) Grey hair with red eyes …

1.4(b) White hair with black eyes …

1.4(c) White hair with red eyes …

1.4(d) Grey hair with black eyes …

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