L11 Plant Science: Anatomy: Leaves Flashcards
(15 cards)
What is the primary function of leaves in gas exchange?
Takes in carbon dioxide and gives out oxygen
What process do leaves use to convert energy from sunlight?
Photosynthesis
Photosynthesis is the process by which plants, algae, and some bacteria convert light energy into chemical energy.
What do leaves store?
Nutrients
Leaves can store various nutrients such as carbohydrates and minerals, which are essential for the plant’s growth.
What is transpiration in relation to leaves?
Evaporation of water
Transpiration helps in nutrient transport and temperature regulation within the plant.
What are the three main leaf regions?
- Epidermis
- Mesophyll
- Veins
Each region has distinct functions and structures related to the leaf’s role in photosynthesis and gas exchange.
What is the function of the epidermis in leaves?
Single layer of cells with stomata for gas and water exchange and a waxy cuticle for waterproofing
The epidermis protects the leaf and helps prevent water loss.
Where does photosynthesis primarily occur in the leaf?
In the mesophyll, specifically 80% in the upper palisade mesophyll and 20% in the lower spongy layer
The mesophyll contains chloroplasts that are essential for photosynthesis.
What are the components of leaf veins?
- Xylem
- Phloem
- Thicker walled parenchymal cells
Veins are crucial for transporting water and nutrients throughout the leaf.
How do leaves in the shade adapt to their environment?
They tend to be larger and darker due to more chloroplasts
This adaptation helps maximize light absorption for photosynthesis.
What adaptations do leaves in dry regions exhibit?
- Thick leathery leaves
- Fewer stomata
- Succulent leaves
- Reduced size to limit surface area
These adaptations help conserve water in arid environments.
What adaptations do aquatic plants have in their leaves?
- Less xylem and phloem
- Large air spaces
These features allow the leaves to float and facilitate gas exchange in water.
What are spines in leaves modified for?
Protection
Spines are adaptations that deter herbivores, while thorns are modified stems.
What is the purpose of tendrils in leaves?
To curl around rigid objects for support
Tendrils help climbing plants attach to structures for stability.
What type of storage do leaves in desert plants provide?
For water or energy
This adaptation is crucial for survival in arid conditions.
What is the function of insect traps in some leaves?
To capture insects in low nitrogen soils
Pitcher plants are an example of leaves adapted for nutrient acquisition.
