OCR A Level Biology A
OCR A Level Biology A Plant and Animal Responses Exam Questions
Free OCR A Level Biology A exam questions on Plant and Animal Responses, with mark schemes. Covers plant hormones, tropisms, the mammalian nervous system, the fight or flight response and muscle contraction.
Plant and Animal Responses exam questions
1 question pack of real past exam questions with its mark scheme. Answer every question without notes, then mark your answers line by line against the mark scheme.
StemUp mark scheme flashcards
OCR A Level Biology A H420 Flashcards (Anki & Quizlet)
Every answer is written in mark scheme wording, so you learn exactly what examiners give marks for. Use them on Anki or Quizlet, then test yourself with the questions on this page.
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About OCR A Level Biology A Plant and Animal Responses
This topic covers responses in plants and animals.
What you need to know
- Plant responses Auxins, gibberellins and abscisic acid; tropisms.
- Nervous system Central and peripheral, somatic and autonomic.
- Fight or flight Coordination by the hypothalamus and adrenaline.
- Muscle contraction Sliding filament model and neuromuscular junctions.
Common mistakes in Plant and Animal Responses
- Saying auxin makes cells shrink in shoots.
- Mixing actin and myosin roles.
- Forgetting ATP is needed to detach myosin heads.
Try three Plant and Animal Responses exam-style questions
1. Explain phototropism in a shoot. (2 marks)
Show the mark scheme answer
Auxin moves to the shaded side (1) and causes cell elongation, so the shoot bends towards light (1).
2. State the role of calcium ions in muscle contraction. (2 marks)
Show the mark scheme answer
Bind to troponin (1), moving tropomyosin to expose binding sites on actin (1).
3. Name the hormone causing stomatal closure. (1 mark)
Show the mark scheme answer
Abscisic acid.
Plant and Animal Responses FAQs
What does this topic cover?
Plant hormones, the nervous system and muscle contraction.
Which practical links here?
Investigating tropisms in seedlings.
What is the autonomic nervous system?
The part controlling involuntary actions.
Revise this topic with flashcards: OCR A Level Biology A H420 Flashcards, with mark scheme answers for Anki and Quizlet.
