Photosynthesis and Plant Functions

The video discusses plant nutrition and photosynthesis, explaining how plants use light energy to manufacture carbohydrates. It covers the structure and function of leaves, adaptations for photosynthesis, and the uses of glucose in plants. Limiting factors affecting photosynthesis and methods to enhance plant nutrition in glasshouses are also explored. The importance of photosynthesis in ecosystems is highlighted.

What is the primary role of chlorophyll in photosynthesis?

• To absorb water

• To absorb light energy

• To release oxygen

• To store glucose

Which part of the leaf is responsible for gas exchange?

• Upper epidermis

• Palisade mesophyll

• Stomata

• Xylem

Which of the following is NOT a function of the upper epidermis?

• Protecting inner layers of cells

• Secreting a waxy cuticle

• Lowering transpiration rates

• Containing chloroplasts

How are palisade cells arranged to maximize photosynthesis?

• Horizontally to expose more surface area

• In clusters to trap more sunlight

• Randomly to increase diversity

• Vertically to minimize cell wall interference

What is the role of xylem vessels in leaves?

• Transporting sucrose

• Carrying water to mesophyll cells

• Exchanging gases

• Storing starch

Why is glucose stored as starch in plants?

• Starch is a large, unreactive molecule

• Starch is soluble in water

• Starch is easily lost from cells

• Starch is more reactive

How do plants use glucose to make proteins?

• By mixing glucose with nitrate molecules

• By converting it into cellulose

• By storing it as starch

• By dissolving it in water

Why is sucrose used for transport in plants instead of glucose?

• Sucrose is more reactive

• Sucrose is less reactive and soluble

• Sucrose is larger and insoluble

• Sucrose is easily lost from cells

What is a limiting factor in photosynthesis?

• A factor that enhances growth

• A factor that decreases carbon dioxide

• A factor that restricts life processes

• A factor that increases oxygen levels

What environmental condition is NOT controlled in a glasshouse?

• Light intensity

• Soil pH level

• Carbon dioxide concentration

• Wind speed