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Plants and animals have many defence responses - AQA - GCSE Biology - Question 4 - 2022 - Paper 1

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Plants and animals have many defence responses. Table 5 shows some plant defences. Identify whether each defence is a chemical response or a physical response. Tic... show full transcript

Worked Solution & Example Answer:Plants and animals have many defence responses - AQA - GCSE Biology - Question 4 - 2022 - Paper 1

Step 1

Identify each defence in Table 5

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Answer

  • Thick, waxy layer on leaf surface: Physical
  • Berries that are poisonous: Chemical
  • Bark on trees that falls off: Physical

Step 2

Suggest how mimicry helps the hornet moth survive

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Answer

Mimicry helps the hornet moth survive by making it appear like the hornet, which deters predators. Animals that may eat them are tricked or warned off by their resemblance to the hornet.

Step 3

Explain why a tree might die if the roots of the tree are damaged

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Answer

When the roots of a tree are damaged, several essential processes are disrupted.

  1. Water Absorption: The damaged roots cannot absorb sufficient water, leading to lower water availability for photosynthesis. This results in reduced glucose production and energy for the plant.
  2. Nutrient Uptake: If roots are damaged, the tree struggles to take up vital minerals and nutrients, which are necessary for growth and cellular processes.
  3. Transport of Nutrients: Damage can impair the transport of nutrients to the cells. Without proper nutrients, the tree can't maintain cell health.
  4. Overall Health: Damaged roots ultimately lead to a decline in the plant's overall health, making it more susceptible to diseases and less able to perform vital functions, thus potentially leading to death.

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