17 October 2021 Lesson Objectives Factors affecting transpiration

17 October 2021 Lesson Objectives Factors affecting transpiration Entry: in silence: 1. Format your desk. 2. Write and underline the date and title. 3. Write the LO: objective. Explain the factors which affect the transpiration stream. DNA: 1. What is transpiration? 2. What are the factors that affect the rate of transpiration? Growing Together - Reaching Higher

Lesson Objectives Explain the factors which affect the transpiration stream. Self-assess 1. Transpiration is the movement of water from the roots of a plant to the leaves. 2. The factors that affect transpiration are: • Air movement • Humidity • Temperature • Light intensity Growing Together - Reaching Higher

Lesson Objectives By the time you leave my lesson today: • • Name the factors which affect the rate of transpiration. Explain how each factor affects transpiration. Name adaptations to reduce transpiration. Describe how transpiration can be measured. Explain the factors which affect the transpiration stream. Growing Together - Reaching Higher

Lesson Objectives Temperature Explain the factors which affect the transpiration stream. Growing Together - Reaching Higher

Lesson Objectives Air movement Explain the factors which affect the transpiration stream. Growing Together - Reaching Higher

Lesson Objectives Humidity Explain the factors which affect the transpiration stream. Growing Together - Reaching Higher

Lesson Objectives Light intensity Explain the factors which affect the transpiration stream. Growing Together - Reaching Higher

Lesson Objectives Explain the factors which affect the transpiration stream. Checking for Understanding • Temperature Transpiration increases as the temperature increases, up until a certain point, then the rate of transpiration remains constant. At higher temperatures molecules move faster increasing the rate of diffusion and evaporation, until the rate of diffusion reaches a maximum. • Air movement Transpiration increases as the wind speed increases. Increasing wind speed increases the rate of evaporation of water vapour out of the leaf. Maintains a high concentration gradient between the inside of the leaf and the surrounding air by removing water vapour as it diffuses out. • Humidity Transpiration decreases as humidity increases. Humid conditions decrease the concentration gradient between the inside of the leaf and the surrounding air by water vapour remaining as it diffuses out. • Light intensity Transpiration increases as light intensity increases up until a certain point then the rate of transpiration remains constant. As light intensity increases stomata (pores in the leaf) open wider to allow more carbon dioxide into the leaf for photosynthesis Growing Together - Reaching Higher

Lesson Objectives How are plants adapted to reduce transpiration? Stomata Explain the factors which affect the transpiration stream. Growing Together - Reaching Higher

Lesson Objectives Checking for Understanding 1. How are plants adapted to reduce transpiration? Explain the factors which affect the transpiration stream. Growing Together - Reaching Higher

Lesson Objectives Explain the factors which affect the transpiration stream. Self-assess 1. Spines instead of leaves 2. Stomata in pits in the leaves 3. Hairy leaves 4. Rolled leaves 5. Leaves droop 6. Thick waxy cuticle Growing Together - Reaching Higher

Lesson Objectives The potometer Explain the factors which affect the transpiration stream. A potometer is a device that measures the rate at which a plant draws up water. Since the plant draws up water as it loses it by transpiration, you are able to measure the rate of transpiration. Growing Together - Reaching Higher

Lesson Objectives Do Not Disturb (20 min) • GCSE question on transpiration Explain the factors which affect the transpiration stream. Growing Together - Reaching Higher

Lesson Objectives Explain the factors which affect the transpiration stream. Sef-assess (a) transpiration / evaporation / diffusion ignore osmosis 1 (b) (i) D 1 (ii) any two from: • more / faster diffusion or evaporation or transpiration • molecules move faster • maintains concentration gradient or keeps water concentration low in the air or brings in more dry air or removes damp air / water 2 [4] Growing Together - Reaching Higher

Explain the factors which affect the transpiration stream. Exit Ticket progression Lesson Objectives 1. Describe two conditions which increase transpiration rate 2 Describe the adaptations in plants which could overcome water loss. Growing Together - Reaching Higher

Exit Routine – make it sharp and purposeful