Control of Growth
Subjects / Additional Science / OCR Gateway Additional Science B
This title will focus on how plants grow, and how growers can manipulate the growth to their advantage. This is important, as growing crops is a business. The faster crops grow, and the greater the yield, the more profit is made. The first chapter will cover the changes in plants that take place when they grow. As plants are made up of cells, in order for the whole organism to get bigger cells have to multiply and then enlarge. Chemicals called hormones control these changes in the cells, and the way that a group of plant hormones called auxins influence a plant's growth will be discussed. The next two chapters will look at how growers can control the growth of plants. Firstly, how greenhouses can be used to speed up plant growth, and then how hormones can be used commercially.
| Author: | Gemma Young | Publisher: | GCSEPod® |
| Narrator: | Pauline Addis | ISBN: | 978-1-84906-218-3 |
| Video ISBN: | 978-1-84906-718-8 |
Chapters
- Plant Cell Division and Growth
- Using Greenhouses
- Using Plant Hormones Commercially
Exam Board Relevance
- Edxcel
- AQA
- CEA
- IGCSE (EdExcel)
- OCR
- SQA
- WJEC
- IGCSE (CiE)
Includes original GCSEPod image art. Additional pictorial images created by Damon Smith
Curriculum and Exam Board Information
Key Issues
Titles
Chapters
- Commercial application of plant hormones
- controlling pests biologically by introduced predators
- controlling weeds and pests using natural chemicals
- Costs and benefits of intensive farming
- describe the economic implications in crop production of enhancing environmental factors, for example fertilizer application
- describe the economic implications in crop production of enhancing environmental factors, for example, carbon dioxide
- describe the economic implications in crop production of enhancing environmental factors, for example, light intensity
- describe the economic implications in crop production of enhancing environmental factors, for example, temperature
- evaluate intensive and organic farming practices in terms of animal welfare and relative costs
- evaluate intensive and organic farming practices in terms of producing sufficient food to feed the world
- evaluate intensive and organic farming practices in terms of the effects on the environment
- excessive use of artificial fertilisers can cause damage to the environment (eutrophication) and be hazardous to health (nitrates in drinking water)
- explain how intensive food production improves energy transfer by reducing energy transfer as heat from farm animals by keeping them indoors
- explain how intensive food production improves energy transfer by reducing energy transfer to competing plants
- explain how intensive food production improves energy transfer by reducing energy transfer to pests
- explain how organic farming uses alternative methods but that productivity may be lower
- explain how scientific thinking has changed/is changing, and some innovations in intensive farming have now been abandoned (the low toxicity of DDT to humans, but the discovery of its accumulation in food chains)
- explain how scientific thinking has changed/is changing, and some innovations in intensive farming have now been abandoned (the suggested link between high protein animal feed and BSE/CJD)
- explain that these practices can cause harm to the environment and health
- explain why intensive farmers can produce more food if they use artificial fertilisers
- explain why intensive farmers can produce more food if they use fungicides
- explain why intensive farmers can produce more food if they use herbicides
- explain why intensive farmers can produce more food if they use pesticides
- explain why intensive farming produces more food
- herbicides, pesticides and fungicides may enter and accumulate in the food chain
- intensive farming of animals raises ethical dilemmas
- interpret data to explain why pesticides may accumulate in the food chain
- keeping animals under more humane conditions
- meat produced in controlled environments
- mechanical elimination of weeds
- natural fertilisers
- organic farming uses alternative methods: controlling pests biologically by introduced predators
- organic farming uses alternative methods: keeping animals under more normal conditions
- organic farming uses alternative methods: mechanical elimination of weeds
- organic farming uses alternative methods: natural fertilisers
- recall one advantage and one disadvantage of each type of farming
- The role of auxins in plant cell division and growth
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