Plant Nutrition

Question 1

What is Photosynthesis?

Answer 1

Photosynthesis: Plants make food (glucose) using sunlight, water, and carbon dioxide.

Question 2

Photosynthesis Word Equation

Answer 2

Equation:
Carbon dioxide + Water → Glucose + Oxygen

Question 3

Photosynthesis Balanced Equation

Answer 3

Balanced Equation:
6CO₂ + 6H₂O → C₆H₁₂O₆ + 6O₂

Question 4

What is Chlorophyll?

Answer 4

Chlorophyll: A green pigment in plants that helps absorb sunlight for photosynthesis.

Question 5

Uses of Glucose in Plants

Answer 5

Uses:
Stored as starch
Makes cell walls (cellulose)
Used for energy
Transported as sucrose

Question 6

Importance of Nitrate Ions

Answer 6

Nitrate Ions: Help plants make proteins.

Question 7

Importance of Magnesium Ions

Answer 7

Magnesium Ions: Help plants make chlorophyll.

Question 8

Investigating Chlorophyll

Answer 8

Test: Boil a leaf, soak it in alcohol, and add iodine.
Result: Blue-black color means starch is present.

Question 9

Light and Photosynthesis investigation

Answer 9

Test: Place a stencil on a leaf and expose it to light.
Result: The parts exposed to light turn blue-black (starch).

Question 10

Carbon Dioxide and Photosynthesis

Answer 10

Test: Use two plants with different CO₂ levels.
Result: More CO₂ = Starch present, less CO₂ = No starch.

Question 11

Limiting Factors in Photosynthesis

Answer 11

Limiting Factors: Light, temperature, and CO₂ can slow photosynthesis if in short supply.

Question 12

Leaf Adaptations for Photosynthesis

Answer 12

Large Surface Area: Helps absorb more light.
Thin: Allows CO₂ to diffuse quickly.

Question 13

Stomata’s Role

Answer 13

Stomata: Tiny holes on leaves that let gases (CO₂ and O₂) move in and out.

Question 14

Guard Cells

Answer 14

Guard Cells: Control the opening and closing of stomata.

Question 15

Xylem and Phloem

Answer 15

Xylem: Transports water.
Phloem: Transports sugar.

Question 16

Effect of Light Intensity on Photosynthesis

Answer 16

More Light: Photosynthesis speeds up.
Less Light: Photosynthesis slows down.
Limiting Factor: Light can be a limiting factor if it’s too low.

Question 17

Effect of Carbon Dioxide on Photosynthesis

Answer 17

More CO₂: Increases photosynthesis rate.
Less CO₂: Decreases photosynthesis rate.
Limiting Factor: CO₂ can be a limiting factor.

Question 18

Effect of Temperature on Photosynthesis

Answer 18

Warm Temperature: Photosynthesis works faster.
Too Hot: Enzymes may be damaged, slowing photosynthesis.
Cold Temperature: Slows down enzyme activity, reducing photosynthesis.

Question 19

How Plants Get Water

Answer 19

Water Uptake: Plants absorb water through their roots.
Xylem: Transports water to the leaves.

Question 20

Starch as Energy Store

Answer 20

Starch: Plants store glucose as starch in roots, stems, and leaves.

Question 21

Photosynthesis in Aquatic Plants

Answer 21

Test for Gas Exchange: Use a hydrogen carbonate indicator to measure CO₂ levels in water.

Question 22

The Role of Root Hair Cells

Answer 22

Root Hairs: Help absorb water and minerals from the soil.