1. Figure 1 shows human blood seen using a light microscope - Edexcel - GCSE Biology - Question 1 - 2021 - Paper 1
Question 1
1. Figure 1 shows human blood seen using a light microscope.
(a) (i) The organelle labelled X controls the activities of the white blood cell. What is the name of o... show full transcript
Worked Solution & Example Answer:1. Figure 1 shows human blood seen using a light microscope - Edexcel - GCSE Biology - Question 1 - 2021 - Paper 1
Step 1
What is the name of organelle X?
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Answer
The organelle labelled X is the nucleus. The nucleus is the control center of the cell, managing gene expression and mediating the replication of DNA during the cell cycle.
Step 2
Complete the sentences.
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Answer
Red blood cells contain the substance haemoglobin.
Blood plasma is a liquid.
Step 3
Describe two ways that white blood cells protect the body from disease.
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Answer
White blood cells, such as lymphocytes, produce antibodies that specifically target and neutralize pathogens like bacteria and viruses.
White blood cells can also engulf and digest foreign invaders through a process called phagocytosis, thereby removing harmful substances from the body.
