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A level biology Edexcel A practice questions
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Practice questions and answers for topic 1, A level biology Edexcel A
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A level Biology Edexcel ATopic 1 - Practice Questions & Answers
1. Why do many animals have a heart and circulation
system?
a. Many animals have a heart and circulation
system to facilitate the mass transport of
nutrients, gases, and wastes throughout their
bodies. This system overcomes the limitations
of diffusion, which is insufficient to meet the
metabolic needs of larger and more complex
organisms.
2. What is the blood clotting process and its role in
cardiovascular disease?
a. The blood clotting process involves the release
of thromboplastin, which converts
prothrombin to thrombin. Thrombin then
converts fibrinogen to fibrin, forming a clot
(fibrin is insoluble). While clotting is essential
to prevent bleeding, inappropriate clot
formation can contribute to cardiovascular
diseases (CVD) by blocking blood flow and
leading to heart attacks or strokes.
, 3. How can you analyse and interpret quantitative
data on illness and mortality rates to determine
health risks?
a. Analysing such data involves looking for
patterns and trends in the prevalence and
incidence of diseases. It's important to
distinguish between correlation (a relationship
between two variables) and causation (one
variable directly affects another). Recognizing
conflicting evidence requires critical
evaluation of study methodologies and
considering alternative explanations.
4. Why is water an important solvent in transport
within the body?
a. Water is a vital solvent in biological transport
because of its dipole nature, allowing it to
dissolve and carry various substances like ions,
nutrients, and gases. Its polarity enables it to
interact with different molecules, facilitating
efficient transport in blood and other bodily
fluids.
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