Podcast
Questions and Answers
What process do plants use to move mineral ions into root cells?
What process do plants use to move mineral ions into root cells?
Active transport
Describe how water moves from roots to the leaves.
Describe how water moves from roots to the leaves.
By transpiration stream in xylem.
What advantage to a plant does having very few stomata on the upper surface of the leaf have?
What advantage to a plant does having very few stomata on the upper surface of the leaf have?
Less water lost so it will not wilt.
Why should tools used to handle plants with TMV be washed afterwards?
Why should tools used to handle plants with TMV be washed afterwards?
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How can scientists use a plant with a TMV-resistant gene to create more plants resistant to TMV?
How can scientists use a plant with a TMV-resistant gene to create more plants resistant to TMV?
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How would you test for the presence of glucose in a fruit?
How would you test for the presence of glucose in a fruit?
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Explain why plants with TMV have stunted growth.
Explain why plants with TMV have stunted growth.
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How does the human body prevent the entry of microbes?
How does the human body prevent the entry of microbes?
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Describe how glucose from the small intestine is moved to a muscle cell.
Describe how glucose from the small intestine is moved to a muscle cell.
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Describe the test you would use to find out if protein is present in food.
Describe the test you would use to find out if protein is present in food.
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Study Notes
Plant Mineral Uptake
- Plants utilize active transport to move mineral ions into root cells, allowing them to absorb essential nutrients effectively.
Water Transport in Plants
- Water travels from roots to leaves through the transpiration stream in the xylem, maintaining hydration and nutrient transport.
Stomata and Water Conservation
- Having fewer stomata on the upper leaf surface reduces water loss, preventing wilting and enhancing survival in arid conditions.
Plant Pathogen Management
- Tools used for handling plants infected with Tobacco Mosaic Virus (TMV) must be washed afterward to prevent the virus's spread to healthy plants.
TMV Resistance Cultivation
- Scientists can cultivate more TMV-resistant plants by extracting stem cells from the meristem of a plant already possessing the resistant gene.
Glucose Detection in Fruits
- To test for glucose, heat a fruit sample and add a few drops of Benedict's solution; a color change from blue to orange indicates glucose presence.
Impact of TMV on Plant Growth
- TMV infection leads to reduced chlorophyll production and leaf discoloration, resulting in stunted growth due to decreased photosynthesis and lower energy availability for growth.
Human Microbial Defense Mechanisms
- The body prevents microbe entry through various barriers: stomach acid kills pathogens in food, skin serves as a physical barrier with antimicrobial secretions, and nasal hairs filter airborne particles.
- Mucus in the trachea and bronchi traps pathogens, while cilia sweep mucus towards the throat for swallowing, further protecting the respiratory system.
Glucose Transport to Muscles
- Glucose from the small intestine enters the bloodstream via diffusion and is transported to muscle cells through capillaries, ensuring energy availability for muscle function.
Protein Detection in Food
- To determine protein presence in food, add Biuret reagent to the sample; a purple coloration indicates that protein is present.
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Description
This quiz features flashcards covering past paper questions and answers based on AQA GCSE Biology. Test your knowledge on key biological processes such as active transport and transpiration. It's a great way to prepare for your exams and reinforce your understanding of plant biology.
