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COPY: Biology IGCSE Past Papers Mistakes

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COPY: Biology IGCSE Past Papers Mistakes

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Questions and Answers

Name 2 statements that are correct about yeast.

Can be used in the production of beer. 2. Cell wall is made of chitin.

What is meant by a group of organs?

Made of tissues that perform a specific function.

Explain how changes in respiration stop gazelles from running at a top speed for a long time.

As the gazelle is running at a top speed, its body can't supply enough oxygen to the muscles for a long time, so it has to start respiring anaerobically. 2. This is because it has less oxygen for aerobic respiration. 3. The glucose is then partially broken down, producing lactic acid.

Use your knowledge of natural selection to explain how a striped coat that reduces the number of flies feeding on zebra blood may have evolved.

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How would the layer of cells behind a lion's retina that reflects light help a lion see in low light intensities?

<p>As light passes through the retina twice.</p> Signup and view all the answers

Suggest an adaptation in the structure of an animal's eye that helps it see in low light intensities.

<p>Size of pupil expands.</p> Signup and view all the answers

Why does the saliva released into a lion's mouth not contain amylase when it eats meat?

<ol> <li>This is because the meat in the lion's mouth is protein. 2. Amylase doesn't break down protein.</li> </ol> Signup and view all the answers

Describe the events that take place from when pollen lands on the stigma of a flower to when a seed is formed.

<ol> <li>Pollen grain lands on a stigma of a flower. 2. A pollen tube grows out of the pollen grain into the style to the ovule. 3. Male gamete nucleus moves down the tube. 4. Joins female gamete in the ovule. 5. The 2 nuclei fuse to form a zygote, which then divides by mitosis into an embryo.</li> </ol> Signup and view all the answers

Method that can be used to estimate the population of fire ants in an area.

<ol> <li>Quadrat sampling can be used. 2. They can be thrown at random. 3. Repeated several times. 4. Then count the number of fire ants inside the quadrant.</li> </ol> Signup and view all the answers

Suggest how this diuretic causes more urine to be produced.

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Describe how a student could measure the heart rate.

<ol> <li>Place fingers on wrist/neck/artery. 2. Count pulse for a minute.</li> </ol> Signup and view all the answers