SB6 Plant structures and their functions Flashcards Preview

GCSE Edexcel Biology > SB6 Plant structures and their functions > Flashcards

Flashcards in SB6 Plant structures and their functions Deck (3)
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1

What are the different tissues in a leaf. List in order from top to bottom

Waxy cuticle
Upper epidermis
Palisade layer
Spongy mesophyll and vascular bundle
Lower epidermis, guard cells and stomata
Waxy cuticle

2

What are the functions of each of the tissues in the leaf

Waxy cuticle - prevent water loss (by evaporation)
Upper epidermis - transparent to allow light to pass through to the palisde layer
Palisade layer - where photosynthesis occurs
Spongy mesophyll - contains air spaces for more efficient gas exchange
Vascular bundle - provide water and take the glucose from photosynthesis
Lower epidermis - contains guard cells which open and close the stomata for efficient gas exchange

3

What are some adaptations that plants have to live in extreme conditions

Cacti
- stems to store water
- deep roots to collect water from deep underground
- spines (modified leaves) to minimize surface area so water loss is reduced and for protection from harmful animals
- very thick waxy cuticle to reduce water loss by evaporation
- less stomata to prevent water loss by transpiration