1
LIFE SCIENCES
2025
GRADE 12
PREPARATORY
EXAMINATION
PAPER 1
Previous exam papers were used to compile these notes. SACAI SEP 2019 – 2021.
LEWENSWETENSKAPPE (VRAESTEL 1) (10831) 2024. NSC AUGUSTUS/SEPTEMBER LIFE
SCIENCE P1 PRELIM | 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.
Note: Certain information is also covered in Term 2 (June) notes. If you have not purchased
T2's notes, contact
Good luck. Juffrou Ansie
Content:
MULTIPLE CHOICE QUESTIONS 2
REPRODUCTIVE STRATEGIES IN VERTEBRATES 8
HUMAN REPRODUCTION 10
HUMAN RESPONSES TO THE ENVIRONMENT 22
THE HUMAN ENDOCRINE SYSTEM AND HOMEOSTASIS 33
PLANT RESPONSES TO THE ENVIRONMENT 38
@ 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 The beneficial effect of the use of adrenaline during an
adrenaline is used as a asthma attack: Relaxation of
treatment for asthma the smooth muscles in the
attacks. airways. Circular muscles
relax and the radial muscles
contract.
Adrenaline The adrenaline hormone affects the rate of heartbeat. An
important hormone in the 'fight or flight' response. High
concentration of adrenaline in the blood results in an
increase in blood glucose levels, because glycogen in the
liver and muscles is converted into glucose.
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.
@ Juffrou_Ansie
, 3
Thyroid stimulating A hormone from the pituitary gland that stimulates the
hormone / TSH thyroid 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.
Examples of reflex Release of saliva when food enters the mouth & pulling your
reactions hand 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
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 The rod of nervous tissue that connects the brain to the rest of
the body.
Meninges 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.
Photopic Receptor cells in the retina that are active in bright light and
photoreceptors. allow us to see colour.
Contraception Procedures to prevent pregnancy.
@ Juffrou_Ansie
, 4
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
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.
@ Juffrou_Ansie
LIFE SCIENCES
2025
GRADE 12
PREPARATORY
EXAMINATION
PAPER 1
Previous exam papers were used to compile these notes. SACAI SEP 2019 – 2021.
LEWENSWETENSKAPPE (VRAESTEL 1) (10831) 2024. NSC AUGUSTUS/SEPTEMBER LIFE
SCIENCE P1 PRELIM | 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.
Note: Certain information is also covered in Term 2 (June) notes. If you have not purchased
T2's notes, contact
Good luck. Juffrou Ansie
Content:
MULTIPLE CHOICE QUESTIONS 2
REPRODUCTIVE STRATEGIES IN VERTEBRATES 8
HUMAN REPRODUCTION 10
HUMAN RESPONSES TO THE ENVIRONMENT 22
THE HUMAN ENDOCRINE SYSTEM AND HOMEOSTASIS 33
PLANT RESPONSES TO THE ENVIRONMENT 38
@ 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 The beneficial effect of the use of adrenaline during an
adrenaline is used as a asthma attack: Relaxation of
treatment for asthma the smooth muscles in the
attacks. airways. Circular muscles
relax and the radial muscles
contract.
Adrenaline The adrenaline hormone affects the rate of heartbeat. An
important hormone in the 'fight or flight' response. High
concentration of adrenaline in the blood results in an
increase in blood glucose levels, because glycogen in the
liver and muscles is converted into glucose.
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.
@ Juffrou_Ansie
, 3
Thyroid stimulating A hormone from the pituitary gland that stimulates the
hormone / TSH thyroid 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.
Examples of reflex Release of saliva when food enters the mouth & pulling your
reactions hand 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
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 The rod of nervous tissue that connects the brain to the rest of
the body.
Meninges 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.
Photopic Receptor cells in the retina that are active in bright light and
photoreceptors. allow us to see colour.
Contraception Procedures to prevent pregnancy.
@ Juffrou_Ansie
, 4
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
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.
@ Juffrou_Ansie
