O Level Biology

Explain: (a) the effects of wind speed, and the variation of temperature, humidity and light intensity on transpiration rate (b) how wilting occurs

Understand that water evaporates from the surfaces of the mesophyll cells into air spaces and then diffuses out of the leaves through the stomata as water vapour

Explain the importance of magnesium ions for making chlorophyll

Explain the importance of nitrate ions for making amino acids, required for the production of proteins

Identify and label the cuticle, cellular and tissue structures of a dicotyledonous leaf, as seen in diagrams or photomicrographs, and explain how these structures are adaptations for photosynthesis and gas exchange, limited to: (a) stomata and guard cells (b) spongy and palisade mesophyll cells (c) air spaces (d) vascular bundles (xylem and phloem) (e) distribution … Read more

State that most leaves have a large surface area and are thin, and explain how these features are adaptations for photosynthesis

Identify and explain the limiting factors of photosynthesis in different environmental conditions

Investigate the effect of varying light intensity, carbon dioxide concentration and temperature on the rate of photosynthesis using submerged aquatic plants and hydrogencarbonate indicator solution

Describe and explain the effect of varying light intensity, carbon dioxide concentration and temperature on the rate of photosynthesis

Investigate the need for chlorophyll, light and carbon dioxide for photosynthesis, using appropriate controls