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Cambridge Primary (1-6). Stage 5. Science. Learner's Book - Unit 4: The digestive system

Question 1

Work in pairs. You will need: a drawing of a human body outline, coloured pencils or felt tip pens.

Draw in as many body organs as you can on the body outline and write their names.

Question 2

Work in pairs. You will need: a drawing of a human body outline, coloured pencils or felt tip pens.

Can you say what each organ does?

Question 3

Work in pairs. You will need: a drawing of a human body outline, coloured pencils or felt tip pens.

Look at other learners' drawings. Add any body organs and labels to your drawing that you have missed out.

Question 4

How does digestion happen?
You will need: a banana, a cracker biscuit, vinegar, water, one leg of a pair of tights with foot cut open, a plastic basin or tray, scissors, a small sealable plastic bag, a newspaper, a plastic squeezy bottle with the base cut off.
- Put the cracker, banana and water into the plastic bag.
- Add orange juice.
- Seal the bag and twist, and squash it a few times until the foods are mixed well with the liquids.
- Pour the squashed food into the tights leg. Do this over a tray placed on a sheet of newspaper.
- Squeeze the food to the end of the leg.
- Water and nutrients from the food will be pushed into the tray. Squeeze until no more broken-down ‘food’ comes out.
- Put what is left in the tights leg into the wide end of the squeezy bottle. Squeeze the bottle hard to push the waste through the other end.

Editorial safety note: the book lists vinegar but asks for orange juice in the steps. Ask the teacher to provide orange juice for the written method. An adult should prepare the cut bottle and tights. Use clean equipment, wash hands, do not eat the model mixture and take care with scissors. This is a model, not actual chemical digestion.

Question 5

How does digestion happen?
You will need: a banana, a cracker biscuit, vinegar, water, one leg of a pair of tights with foot cut open, a plastic basin or tray, scissors, a small sealable plastic bag, a newspaper, a plastic squeezy bottle with the base cut off.
- Put the cracker, banana and water into the plastic bag.
- Add orange juice.
- Seal the bag and twist, and squash it a few times until the foods are mixed well with the liquids.
- Pour the squashed food into the tights leg. Do this over a tray placed on a sheet of newspaper.
- Squeeze the food to the end of the leg.
- Water and nutrients from the food will be pushed into the tray. Squeeze until no more broken-down ‘food’ comes out.
- Put what is left in the tights leg into the wide end of the squeezy bottle. Squeeze the bottle hard to push the waste through the other end.

Editorial safety note: the book lists vinegar but asks for orange juice in the steps. Ask the teacher to provide orange juice for the written method. An adult should prepare the cut bottle and tights. Use clean equipment, wash hands, do not eat the model mixture and take care with scissors. This is a model, not actual chemical digestion.

Say which part of the digestive system and digestion is represented by the: cracker and banana.

Question 6

How does digestion happen?
You will need: a banana, a cracker biscuit, vinegar, water, one leg of a pair of tights with foot cut open, a plastic basin or tray, scissors, a small sealable plastic bag, a newspaper, a plastic squeezy bottle with the base cut off.
- Put the cracker, banana and water into the plastic bag.
- Add orange juice.
- Seal the bag and twist, and squash it a few times until the foods are mixed well with the liquids.
- Pour the squashed food into the tights leg. Do this over a tray placed on a sheet of newspaper.
- Squeeze the food to the end of the leg.
- Water and nutrients from the food will be pushed into the tray. Squeeze until no more broken-down ‘food’ comes out.
- Put what is left in the tights leg into the wide end of the squeezy bottle. Squeeze the bottle hard to push the waste through the other end.

Editorial safety note: the book lists vinegar but asks for orange juice in the steps. Ask the teacher to provide orange juice for the written method. An adult should prepare the cut bottle and tights. Use clean equipment, wash hands, do not eat the model mixture and take care with scissors. This is a model, not actual chemical digestion.

Say which part of the digestive system and digestion is represented by the: water.

Question 7

How does digestion happen?
You will need: a banana, a cracker biscuit, vinegar, water, one leg of a pair of tights with foot cut open, a plastic basin or tray, scissors, a small sealable plastic bag, a newspaper, a plastic squeezy bottle with the base cut off.
- Put the cracker, banana and water into the plastic bag.
- Add orange juice.
- Seal the bag and twist, and squash it a few times until the foods are mixed well with the liquids.
- Pour the squashed food into the tights leg. Do this over a tray placed on a sheet of newspaper.
- Squeeze the food to the end of the leg.
- Water and nutrients from the food will be pushed into the tray. Squeeze until no more broken-down ‘food’ comes out.
- Put what is left in the tights leg into the wide end of the squeezy bottle. Squeeze the bottle hard to push the waste through the other end.

Editorial safety note: the book lists vinegar but asks for orange juice in the steps. Ask the teacher to provide orange juice for the written method. An adult should prepare the cut bottle and tights. Use clean equipment, wash hands, do not eat the model mixture and take care with scissors. This is a model, not actual chemical digestion.

Say which part of the digestive system and digestion is represented by the: orange juice.

Question 8

How does digestion happen?
You will need: a banana, a cracker biscuit, vinegar, water, one leg of a pair of tights with foot cut open, a plastic basin or tray, scissors, a small sealable plastic bag, a newspaper, a plastic squeezy bottle with the base cut off.
- Put the cracker, banana and water into the plastic bag.
- Add orange juice.
- Seal the bag and twist, and squash it a few times until the foods are mixed well with the liquids.
- Pour the squashed food into the tights leg. Do this over a tray placed on a sheet of newspaper.
- Squeeze the food to the end of the leg.
- Water and nutrients from the food will be pushed into the tray. Squeeze until no more broken-down ‘food’ comes out.
- Put what is left in the tights leg into the wide end of the squeezy bottle. Squeeze the bottle hard to push the waste through the other end.

Editorial safety note: the book lists vinegar but asks for orange juice in the steps. Ask the teacher to provide orange juice for the written method. An adult should prepare the cut bottle and tights. Use clean equipment, wash hands, do not eat the model mixture and take care with scissors. This is a model, not actual chemical digestion.

Say which part of the digestive system and digestion is represented by the: plastic bag.

Question 9

How does digestion happen?
You will need: a banana, a cracker biscuit, vinegar, water, one leg of a pair of tights with foot cut open, a plastic basin or tray, scissors, a small sealable plastic bag, a newspaper, a plastic squeezy bottle with the base cut off.
- Put the cracker, banana and water into the plastic bag.
- Add orange juice.
- Seal the bag and twist, and squash it a few times until the foods are mixed well with the liquids.
- Pour the squashed food into the tights leg. Do this over a tray placed on a sheet of newspaper.
- Squeeze the food to the end of the leg.
- Water and nutrients from the food will be pushed into the tray. Squeeze until no more broken-down ‘food’ comes out.
- Put what is left in the tights leg into the wide end of the squeezy bottle. Squeeze the bottle hard to push the waste through the other end.

Editorial safety note: the book lists vinegar but asks for orange juice in the steps. Ask the teacher to provide orange juice for the written method. An adult should prepare the cut bottle and tights. Use clean equipment, wash hands, do not eat the model mixture and take care with scissors. This is a model, not actual chemical digestion.

Say which part of the digestive system and digestion is represented by the: tights leg.

Question 10

How does digestion happen?
You will need: a banana, a cracker biscuit, vinegar, water, one leg of a pair of tights with foot cut open, a plastic basin or tray, scissors, a small sealable plastic bag, a newspaper, a plastic squeezy bottle with the base cut off.
- Put the cracker, banana and water into the plastic bag.
- Add orange juice.
- Seal the bag and twist, and squash it a few times until the foods are mixed well with the liquids.
- Pour the squashed food into the tights leg. Do this over a tray placed on a sheet of newspaper.
- Squeeze the food to the end of the leg.
- Water and nutrients from the food will be pushed into the tray. Squeeze until no more broken-down ‘food’ comes out.
- Put what is left in the tights leg into the wide end of the squeezy bottle. Squeeze the bottle hard to push the waste through the other end.

Editorial safety note: the book lists vinegar but asks for orange juice in the steps. Ask the teacher to provide orange juice for the written method. An adult should prepare the cut bottle and tights. Use clean equipment, wash hands, do not eat the model mixture and take care with scissors. This is a model, not actual chemical digestion.

Say which part of the digestive system and digestion is represented by the: tray.

Question 11

How does digestion happen?
You will need: a banana, a cracker biscuit, vinegar, water, one leg of a pair of tights with foot cut open, a plastic basin or tray, scissors, a small sealable plastic bag, a newspaper, a plastic squeezy bottle with the base cut off.
- Put the cracker, banana and water into the plastic bag.
- Add orange juice.
- Seal the bag and twist, and squash it a few times until the foods are mixed well with the liquids.
- Pour the squashed food into the tights leg. Do this over a tray placed on a sheet of newspaper.
- Squeeze the food to the end of the leg.
- Water and nutrients from the food will be pushed into the tray. Squeeze until no more broken-down ‘food’ comes out.
- Put what is left in the tights leg into the wide end of the squeezy bottle. Squeeze the bottle hard to push the waste through the other end.

Editorial safety note: the book lists vinegar but asks for orange juice in the steps. Ask the teacher to provide orange juice for the written method. An adult should prepare the cut bottle and tights. Use clean equipment, wash hands, do not eat the model mixture and take care with scissors. This is a model, not actual chemical digestion.

Say which part of the digestive system and digestion is represented by the: plastic squeezy bottle.

Question 12

How does digestion happen?
You will need: a banana, a cracker biscuit, vinegar, water, one leg of a pair of tights with foot cut open, a plastic basin or tray, scissors, a small sealable plastic bag, a newspaper, a plastic squeezy bottle with the base cut off.
- Put the cracker, banana and water into the plastic bag.
- Add orange juice.
- Seal the bag and twist, and squash it a few times until the foods are mixed well with the liquids.
- Pour the squashed food into the tights leg. Do this over a tray placed on a sheet of newspaper.
- Squeeze the food to the end of the leg.
- Water and nutrients from the food will be pushed into the tray. Squeeze until no more broken-down ‘food’ comes out.
- Put what is left in the tights leg into the wide end of the squeezy bottle. Squeeze the bottle hard to push the waste through the other end.

Editorial safety note: the book lists vinegar but asks for orange juice in the steps. Ask the teacher to provide orange juice for the written method. An adult should prepare the cut bottle and tights. Use clean equipment, wash hands, do not eat the model mixture and take care with scissors. This is a model, not actual chemical digestion.

Say which part of the digestive system and digestion is represented by the: nozzle of the bottle.

Question 13

How does digestion happen?
You will need: a banana, a cracker biscuit, vinegar, water, one leg of a pair of tights with foot cut open, a plastic basin or tray, scissors, a small sealable plastic bag, a newspaper, a plastic squeezy bottle with the base cut off.
- Put the cracker, banana and water into the plastic bag.
- Add orange juice.
- Seal the bag and twist, and squash it a few times until the foods are mixed well with the liquids.
- Pour the squashed food into the tights leg. Do this over a tray placed on a sheet of newspaper.
- Squeeze the food to the end of the leg.
- Water and nutrients from the food will be pushed into the tray. Squeeze until no more broken-down ‘food’ comes out.
- Put what is left in the tights leg into the wide end of the squeezy bottle. Squeeze the bottle hard to push the waste through the other end.

Editorial safety note: the book lists vinegar but asks for orange juice in the steps. Ask the teacher to provide orange juice for the written method. An adult should prepare the cut bottle and tights. Use clean equipment, wash hands, do not eat the model mixture and take care with scissors. This is a model, not actual chemical digestion.

Say how the model is different to the human digestive system.

Question 14

How does digestion happen?
You will need: a banana, a cracker biscuit, vinegar, water, one leg of a pair of tights with foot cut open, a plastic basin or tray, scissors, a small sealable plastic bag, a newspaper, a plastic squeezy bottle with the base cut off.
- Put the cracker, banana and water into the plastic bag.
- Add orange juice.
- Seal the bag and twist, and squash it a few times until the foods are mixed well with the liquids.
- Pour the squashed food into the tights leg. Do this over a tray placed on a sheet of newspaper.
- Squeeze the food to the end of the leg.
- Water and nutrients from the food will be pushed into the tray. Squeeze until no more broken-down ‘food’ comes out.
- Put what is left in the tights leg into the wide end of the squeezy bottle. Squeeze the bottle hard to push the waste through the other end.

Editorial safety note: the book lists vinegar but asks for orange juice in the steps. Ask the teacher to provide orange juice for the written method. An adult should prepare the cut bottle and tights. Use clean equipment, wash hands, do not eat the model mixture and take care with scissors. This is a model, not actual chemical digestion.

Tell another group how each step matches what happens in the human digestive system.

Question 18

What is the name of the tube that joins the mouth to the stomach?

Question 19

What is the stomach’s function in digestion?

Question 20

Which part of the digestive system removes undigested wastes?
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