Question 1
The diameter off field of view of a light microscope is 6.5mm. Plant cells lying across the diameter are 12. Determine the size of 1cell in micrometers
Answer
Question 2.
List two structural adaptations that make xylem vessels suitable for transport of water and minerals salts
Answer
– Hollow for continuous flow of water from roots to leaves;
– Have dead cells to allow flow of water and mineral salts without interruption
– Have dead cells to allow flow of water and mineral salts without interruption
Question 3
The equation below represents a certain biological process in cells.
C6H6 + 6O2 → 6CO2 + 6H2O + ATP
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i) Name the biological process
ii) Name the cell organelle where the process occurs.
Answer
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i) Respiration
ii) Mitochondrion
Question 4
Name the tissue whose cells are thickened with cellulose and pectin.
Answer
Collenchyma
Question 5
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i) Distinguish between the lymphocytes and phagocytes
ii) Name the enzyme in erythrocytes that speeds up conversion of carbon (IV) oxide to carbonic acid - Name the disease that causes thickening and hardening of arteries
Answer
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i)
ii) carbonic anhydrase - arteriosclerosis