Leaf Structure and Function

The leaf has a shiny, waxy cuticle around the upper and lower epidermis to

• increase the rate of photosynthesis

• attract more light

• control water loss

• stop carbon dioxide and oxygen gases escaping

Most of the chloroplasts are located in the

• upper epidermis

• pallisade mesophyll layer

• lower epidermis

• spongy mesophyll layer

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The water needed for photosynthesis comes into the leaves through the

• phloem

• stomata

• guard cells

• xylem

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The important gases, carbon dioxide and oxygen, enter and exit the leaf through the

• upper epidermis

• phloem

• stomata

• guard cells

Tags

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The reactants needed for photosynthesis to occur are:

• carbon dioxide & water

• glucose & oxygen

• oxygen & water

• carbon dioxide & oxygen

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The role of the guard cell is to

• help control the temperature of the plant

• control how much water enters the leaf

• control how much glucose is stored

• control the movement of water vapour & gases

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In the process of photosynthesis glucose and oxygen would be classified as

• reactants

• products

• raw materials

• catalysts

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Transpiration helps the plant maintain homeostasis by

• making more glucose at night

• moving water from the roots to the stem and leaves

• moving glucose from the leaf to be stored in the stem & roots

• making more chloroplasts

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Water & soluble nutrients are transported throughout the plant by the

• phloem

• xylem

• root hair cells

• upper & lower epidermis

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The movement of gases, CO₂ in and O₂ out, occurs through the

• phloem cells

• xylem cells

• root hair cells

• stomates

Tags

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