Summary Gr 12 Life Sciences Record & Final 2024 Paper 1
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Course
Life Sciences
Institution
12th Grade
Life Sciences Record & Final 2024 Paper 1
. SACAI SEP 2019 – 2020 & NOV 2021&
NCC 2020 & 2022. NSC DBE/November 2023
Content:
Multiple choice questions p. 2
1. Meiosis p. 7
2. Reproductive strategies in vertebrates p. 8
3. Human reproduction p. 18
4. Human responses to the environment...
LIFE SCIENCES
2024
GRADE 12
RECORD EXAM &
Final exam
PAPER 1
Previous exam papers were used to compile these notes. SACAI SEP 2019 – 2020 & NOV 2021&
NCC 2020 & 2022. NSC DBE/November 2023. These are only suggested answers from the
memorandums. Some information is repeated, I want to show you the different ways the same
information is asked.
I encourage you to answer the calculation/illustration questions.
Good luck. Juffrou Ansie
Content:
Multiple choice questions p. 2
1. Meiosis p. 7
2. Reproductive strategies in vertebrates p. 8
3. Human reproduction p. 18
4. Human responses to the environment p. 23
5. The human endocrine system and homeostasis p. 35
6. Plant responses to the environment p. 45
7. Human impact of the environment p. 49 - 55
@ Juffrou_Ansie
, 2
MULTIPLE CHOICE QUESTIONS
The description of the physical defence mechanism of the Acacia
species against herbivores: The growth of longer, denser spines or
thorns. Mechanical/physical protection mechanism
The hormone adrenaline is The beneficial effect of the use of adrenaline during an asthma
used as a treatment for attack: Relaxation of the smooth muscles in the airways.
asthma attacks.
Recycling The process of making new products from materials that have
previously been used for something else.
Endometrium Gland-rich, vascular inner layer of the uterus where implantation of
the embryo takes place.
Medulla oblongata The structure in the human body that contains chemoreceptors to
detect the changes in blood pH caused by an increase in carbon
dioxide.
Epididymis The structure in the male reproductive system where sperm is
stored.
Biodegradable Substances that can be broken down naturally.
Cervix The lower part of the uterus that is connected to the vagina.
Cretinism The condition caused by an under secretion of thyroxine in
children.
Thyroid stimulating A hormone from the pituitary gland that stimulates the thyroid
hormone / TSH gland to produce its hormone/ The hormone that increase in the
rate of the metabolic rate of the cells stimulates
Menstrual cycle The monthly cycle of changes in the ovaries and the lining of the
uterus.
Islets of Langerhans Small groups of cells in the pancreas that perform an endocrine
function by secreting hormones.
Endothermic The group of animals that maintain a constant body temperature
regardless of the ambient temperature.
@ Juffrou_Ansie
, 3
Examples of reflex Release of saliva when food enters the mouth & pulling your hand
reactions away from a sharp object.
The depletion of the ozone layer due to chemicals such as chlorofluorocarbons (CFCs) leads to
skin cancer
Lens Part of the eye where cataracts form
The action of adrenaline on Circular muscles relax and the radial muscles contract.
the muscles of the iris of
the eye
Negatively geotropic The response of stems to gravity shows that they are negatively
geotropic
Umbilical vein /vena The blood vessel that carries oxygen and nutrients from the mother
to the foetus.
Spinal cord / spinal cord The rod of nervous tissue that connects the brain to the rest of the
body.
Opinions Protective membranes that surround the brain and spinal cord.
Puberty The process of physical and mental changes during which a child's
body becomes sexually mature.
Skittles Receptor cells in the retina that are active in bright light and allow
us to see colour.
Contraception Procedures to prevent pregnancy.
Optic nerve The bundle of nerve tissues that conducts impulses from the retina
to the cerebrum.
Illustration of a homologous pair of chromosomes at the beginning
of meiosis
Sustainability Maintaining biodiversity is important for sustainability. Meet the
needs of people today without damaging the earth for future
generations
Illustration of meiosis
@ Juffrou_Ansie
, 4
Acrosome
The acrosome contains enzymes that help break down the outer
layer of the ovum.
Myopia
Distant objects cannot be seen clearly.
Urethra The male reproductive tube that carries both urine and semen to
the outside of the body.
Suspensory ligaments Structures that connect the ciliary body to the elastic lens.
Abscisic acid The plant hormone that slows plant growth and enables plants to
survive harsh climate conditions.
Axons Nerve fibres that carry the nerve impulses away from the cell body.
Altricial development The kind of development that occurs in animals that spend most of
their energy on feeding and protecting their offspring after birth.
Accommodation The ability of the lens to change the shape of its curvature with
respect to the distance of an object from the eye.
Monoculture A farming practice where a single crop is planted on the same plot
of land for a number of consecutive years.
Blastocyst A multicellular structure that develops from the zygote and
implants in the uterus.
Ovovipary A form of reproduction where the embryo develops in the mother's
body where it is nourished by a placenta until it is born.
Goitre
The mineral that the woman is deficient in is Iodine.
Hypothalamus The temperature control centre of the brain
The effects of auxins on They keep the cell walls elastic
cells
@ Juffrou_Ansie
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