Doc Brown's GCSE OCR 21st Century Science-Biology Revision Notes

PLEASE NOTE NEW revision summaries for the NEW OCR 21st Century Science B GCSE Biology B and NEW OCR GCSE 21st Century Combined Science B Biology courses: Revision for Chapters 1-3) and  Paper 2 (Chapters 4-6) STARTING with Y10 in Sept. 2016 onwards, first exams in 2018

OCR GCSE 21st Century Additional Science Biology Module B5 Growth and development

B5.1 How do organisms develop?

  • 1. know that cells in multicellular organisms can be specialised to do particular jobs

  • 2. know that groups of specialised cells are called tissues, and groups of tissues form organs

  • 3. know that a fertilised egg cell (zygote) divides by mitosis to form an embryo

  • 4. know that in a human embryo up to (and including) the eight cell stage, all the cells are identical (embryonic stem cells) and could produce any type of cell required by the organism

  • 5. understand that after the eight cell stage, most of the embryo cells become specialised and form different types of tissue

  • 6. understand that some cells (adult stem cells) remain unspecialised and can become specialised at a later stage to become many, but not all, types of cell required by the organism

  • 7. understand that in plants, only cells within special regions called meristems are mitotically active

  • 8. understand that the new cells produced from plant meristems are unspecialised and can develop into any kind of plant cell

  • 9. understand that unspecialised plant cells can become specialised to form different types of tissue (including xylem and phloem) within organs (including flowers, leaves, stems and roots)

  • 10. understand that the presence of meristems (as sources of unspecialised cells) allows the production of clones of a plant from cuttings, and that this may be done to reproduce a plant with desirable features

  • 11. understand that a cut stem from a plant can develop roots and then grow into a complete plant which is a clone of the parent, and that rooting can be promoted by the presence of plant hormones (auxins)

  • 12. understand that the growth and development of plants is also affected by the environment, eg phototropism

  • 13. understand how phototropism increases the plantís chance of survival

  • 14. HT only: be able to explain phototropism in terms of the effect of light on the distribution of auxin in a shoot tip.




  • OCR GCSE Twenty First Century Additional Science BIOLOGY Module B5 Growth and development

  • When revising, these pages provide you with a summary of what you need to know and be able to do.

  • BUT remember, your primary source of revision are your class notes, investigations and OCR 21st C GCSE science textbooks and classwork worksheets as well as examination practice with past papers.

  • PLEASE NOTE My NEW GCSE (9-1) BIOLOGY REVISION SUMMARIES for Y10 2016-2017 onwards

    AQA GCSE Biology 8461  1st Paper (Topics 1-4 & Combined Science Trilogy Biology 1 Topics 1-4)

    AQA GCSE Biology 8461  2nd Paper (Topics 5-7 & Combined Science Trilogy Biology 2 Topics 5-7)

    Edexcel GCSE (9-1) Biology 1st Paper (Topics 1-5 & Combined Science Biology 1 Topics 1-5)

    Edexcel GCSE (9-1) Biology 2nd Paper (Topics 1, 6-9 & Combined Science Biology 2 Topics 1, 6-9)

    OCR (9-1) Gateway Science GCSE Biology A 1st Paper (Topics B1-3 & Combined Science A Biology 1 Topics B1-3)

    OCR (9-1) Gateway Science GCSE Biology A 2nd Paper (Topics B4-6 & Combined Science A Biology 1 Topics B4-6)

    OCR (9-1) 21st Century Science GCSE Biology B Chapters B1-3 (Chapters B1-3, GCSE Combined Science B biology)

    OCR (9-1) 21st Century Science GCSE Biology B Chapters B4-6 (Chapters B4-6, GCSE Combined Science B biology)

 Doc Brown's Chemistry 


For latest updates see


visits since January 2000