GCSE Biology - Structure of a Leaf and Stomata #50

The video explores plant structure, focusing on how cells form tissues, organs, and organ systems. It examines the leaf's structure, highlighting its role in photosynthesis, which requires carbon dioxide and water. The process of photosynthesis is detailed, including the transport of sugars via the Floum. The video also addresses water loss issues in leaves and the function of stomata and guard cells in regulating gas exchange and water conservation. Lastly, it discusses meristem tissue's role in plant growth and differentiation.

What is the primary function of a leaf in a plant's organ system?

• To store nutrients

• To support the plant structure

• To transport water

• To perform photosynthesis

Which part of the leaf is primarily responsible for photosynthesis?

• Spongy mesophyll

• Palisade mesophyll

• Upper epidermis

• Lower epidermis

How do leaves minimize water loss while still allowing gas exchange?

• By increasing the number of stomata

• By having a waxy cuticle and regulating stomata opening

• By closing stomata during the day

• By reducing the number of chloroplasts

What happens to guard cells when a plant has plenty of water?

• They lose chlorophyll

• They shrink and reduce gas exchange

• They become turgid and open the stomata

• They become flaccid and close the stomata

Why are most stomata located on the underside of leaves?

• To increase photosynthesis

• To reduce water evaporation

• To protect from insects

• To enhance nutrient absorption