Biology Paper 1 · B3 · Lesson 3.4
Recognise the signs and explain why infected plants grow less.
TMV infects plants, including tobacco and tomatoes. It causes a mottled mosaic pattern on leaves. Less healthy green tissue means less photosynthesis, so less sugar is made for growth.
A simplified leaf diagram showing mottled colour, not a photograph.
No timer. Read the explanation after each answer.
Daily 5 · Exam practice · Download the A4 revision sheet
Core content is shared by Foundation and Higher Tier. Challenge questions ask you to explain and apply it.
AQA Combined Science Trilogy specification · 4.3.1.2–4.3.1.4. Notes, questions and diagrams are original teaching material.
Rose leaf: LiquidGhoul / Wikimedia Commons, public domain. Mosquito: CDC / Jim Gathany, PHIL 5814, public domain. This photograph shows a vector species; it does not establish that this individual carries malaria.