1. Figure 1 shows human blood seen using a light microscope - Edexcel - GCSE Biology Combined Science - 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 Combined Science - Question 1 - 2021 - Paper 1
Step 1
What is the name of organelle X?
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Answer
The organelle labelled X that controls the activities of the white blood cell is the nucleus (Option D). The nucleus is responsible for regulating cellular processes, including gene expression and cell division.
Step 2
Use words from the box to 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 play a crucial role in the immune system. They protect the body from disease in several ways:
Phagocytosis: White blood cells, such as neutrophils and macrophages, engulf and digest pathogens (like bacteria and viruses) through a process called phagocytosis.
Antibody Production: Other types of white blood cells, particularly B lymphocytes, produce antibodies that specifically target and neutralize pathogens, marking them for destruction by other immune cells.
