EXPLAIN THE TERM IN VITRO FERTILISATION

Involves removing eggs from the ovary and fertilising them outside the body.

SUGGEST A REASON FOR THE REMOVAL OF SEVERAL EGGS

A number of eggs are removed to increase the chances of fertilisation occurring and getting an embryo to implant.

IDENTIFY A GERM LAYER FROM WHICH THE SKIN OF THE DEVELOPING EMBRYO ARISES ?

Ectoderm

FROM WHICH TISSUES DOES THE PLACENTA FROM

The placenta is formed from the chorion (the outer membrane of the embryo) and the mother’s blood vessels.

EXPLAIN WHY MIXING MUST NOT OCCUR

Blood groups may be different types, if their... (More)

The Scientific Method

• Scientific Method is a process of investigation where problems are identified and their explanations are tested by carrying out experiments.
• Observation : An unbiased, accurate report of an event.
• Hypothesis : An educated guess based on observations.
• Experiment : An experiment is designed to test a hypothesis.
• Data : Consists of measurements, observations/information gathered during an experiment.
• Replicate : A repeat of an experiment.
• Control : A comparison used to provide a standard against which the actual experiment can be judged.
• Theory : A hypothesis that has been supported by different experiments.
• Principle/Law : A theory that... (More)

WHY IS HOMEOSTASIS IMPORTANT IN THE BODY

Because we would not survive if conditions were to vary greatly. Conditions are kept at optimum for enzyme activity.

DESCRIBE THE PROCESS OF INHALATION.

It is an active process.

• The diaphragm contracts and flattens, while at the same time the intercostal muscles contract
• Lifting the ribcage up and out
• These movements cause an increase in the volume of the thorax cavity
• Which causes a decrease in pressure which forces air into the lungs

NAME A BREATHING DISORDER

Asthma

STATE A CAUSE AND TREATMENT

cause:It is an allergic reaction to a trigger/ allergen in... (More)