the process used by producers to make their own food via a series of chemical reactions

a type of sugar, which is a simple carbohydrate

a complex carbohydrate, made of many glucose molecules joined together to form a polymer

a reagent that can be used to test for the presence of starch

a scientific prediction is a testable statement about a possible outcome, which could be tested in an experiment

The requirements and products of photosynthesis: practical

Combined science

Pupils will learn more about aerobic and anaerobic cellular respiration, including the chemical reactants and products of the processes, and practical ways to measure the rate of cellular respiration in living cells.

Pupils learned how hormones and glands of the human endocrine system enable us to coordinate and control changes in our bodies.

This unit explores photosynthesis as the basis for food and biomass, examines cell structure and adaptations in eukaryotic and prokaryotic cells, and covers the photosynthesis process. It focuses on using models and theories to develop hypotheses, interpret data, and present reasoned explanations.

Photosynthesis: requirements and products

Physical activity and equipment requiring safe use

Some of the glucose made by photosynthesis is used to make a larger carbohydrate called {{}}, which is stored in grains in plant cells.

The reagent called {{}} solution is used to test for the presence of starch.

True or false? The iodine test result for this leaf shows that it contains starch.

Foil was attached to this leaf to block out the ...

To show the presence of starch with a blue/black colour.

Why is a leaf placed in hot ethanol when testing for the presence of starch?

Area A had less chlorophyll so less starch was made.

Area A had more chlorophyll so more starch was made.

Area A had less carbon dioxide so less starch was made.

Area A had more carbon dioxide so more starch was made.

The photographs show the same leaf before and after the iodine method was used to test it for starch. Which statement explains why area A turned a darker colour during the test?

Cells in the leaves of plants have chloroplasts that contain a green pigment called {{}}.

The energy required for photosynthesis is transferred to chlorophyll by ...

carbon dioxide + water --> glucose + oxygen

carbon dioxide + oxygen --> glucose + water

glucose + oxygen --> carbon dioxide + water

glucose + carbon dioxide --> water + oxygen

What is the correct word summary for photosynthesis?

Some of the glucose made by photosynthesis is stored as starch. Which reagent can be used to test for the presence of starch?

Iodine solution changes colour in the presence of starch. What colour would you expect the iodine solution to be when starch is present?

Lucas: This would have no effect on the amount of glucose made.

Izzy: No glucose would be made because photosynthesis needs carbon dioxide.

Laura: Carbon dioxide is just a waste product, so more glucose would be made.

Who correctly predicts what would happen if there was no carbon dioxide available for a plant during the day?

Content guidance

Risk assessment required - equipment

Adult supervision required

Introduction

What will you need for this lesson?

Are you ready to learn?

Equipment

Content guidance

Supervision

Worksheet