2e. Nutrition

Question 1

Photosynthesis equation

Answer 1

6 CO2 + 6 H2O → C6H12O6 + 6 O2

Question 2

What is photosynthesis?

Answer 2

Production of Glucose in cells using light energy from the Sun

Question 3

3 factors that limit the rate of photosynthesis

Answer 3

Light intensity
Carbon Dioxide concentration
Temperature

Question 4

How do the 3 factors limit the rate of photosynthesis?

Answer 4

When not enough of 1 of the 3 factors the rate of photosynthesis decreases. And if there is absence of any photosynthesis wont take place

Question 5

5 Structures of a leaf

Answer 5

• Wax cuticle (prevents water loss)
• Upper epidermis (thin and tranparent to allow more light)
• Palisade mesophyll (tightly packed)
• Spongy mesophill (contains air spaces to increase the surface area to volume ratio)
• Lower epidermis (contains guard cells and stomata)

Question 6

3 Adaptations for photosynthesis

Answer 6

• Surface area (large)
• Thickness (Thin)
• Clorophyll (tightly packed & present in large amounts)

Question 7

What 2 minerals do plants need for growth

Answer 7

Magnesium and Nitrate

Magnesium: needed to build chlorophyll for growth
Nitrate: needed to produce amino acids to build Protein and DNA

When no enough…
Magnesium: Leaves turn yellow
Nitrate: Leaves turn yellow and stunted growth

Question 8

What is a balanced diet?

Answer 8

Diet in which all components needed to maintain health are present in appropriate proportions

Question 9

What things does a balanced diet need? (7)

Answer 9

1. Carbohydrates
2. Protein
3. Lipids
4. Vitamins
5. Minerals
6. Dietary fibre
7. Water

Question 10

Where can you find Carbohydrates, Proteins, Lipids, Vitamins A, C, and D, Mineral Ions Calcium and Iron, Water and Dietary Fibre. And why do we need them?

Answer 10

= Carbohydrates: Meat, starch. For direct ebergy source
= Proteins: Meat. For growth and repair
= Lipids: Meat. For insulation and energy store
= Vitamin A: Carrots. For healthy eye sight
= Vitamin C: Lemons. To heal wound and rebuild tissue
= Vitamin D: Margarine. To strengthen teeth and bones
= Calcium: Milk. To strengthen teeth and bones
= Iron: Meat. To promote Haemoglobin
= Water: Water. It allows chemical reactions to occur
= Dietary fibres: Vegetables. It lowers Cholesterol

Question 11

Where is bile produced?

Answer 11

In the liver

Question 12

Where is bile stored?

Answer 12

In the gallbladder

Question 13

What is bile used for?

Answer 13

Neutralises the acids in the stomach and emulsifies lipids