Structure of leaves

Fatima K
Flashcards by Fatima K, updated more than 1 year ago
Fatima K
Created by Fatima K over 4 years ago
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Description

Flashcards on parts of a leaf and their use

Resource summary

Question Answer
How is a leaf structured? 08f1a42d-ce72-481e-bd72-ebfeb0581df5.gif (image/gif)
What does the waxy cuticle do? It is a thin waxy layer that is transparent to allow light through to the chloroplasts in the cells of a leaf, it also acts as a barrier to water loss through evaporation and entry of disease by microorganisms - like bacteria
How are palisade cells structured? ca1f6f3e-7a93-49ac-9ec6-7f0abbff475a.gif (image/gif)
What is the purpose of palisade cells? This is the main site of photosynthesis because this the the uppermost layer that contains chloroplasts and is the layer which has the most number of chlroplasts
What are the advantages of palisade cells being long and closely packed? There is more chlorophyll in a small space
Where are chloroplasts found? Found in palisade, spongy and guard cells.
What is the mesophyll layer? It is the middle of the leaf - contains the palisade and spongy layer.
Describe the spongy layer. It is more rounded and less closely packed than the palisade layer. It can photosynthesise but has fewer chloroplasts than the palisade layer. Main site of gas exchange in the leaf.
What is the lower epidermis? It contains the guard cells and stomata
Why do leaves have stomata? To allow the exchange of gases depending on the condition
Purpose of guard cells. Help the stomata to regulate the rate of transpiration by opening or closing.
What are the veins in a leaf and why do leaves have them? They are the xylem and phloem and transport food and water within the plant.
Explain the function of xylem. Water and mineral ions are supplied to the leaf by the xylem, it is part of a continuous transport system.
Explain the function of the phloem. Carries the products of photosynthesis - sugars, from the mesophyll cells to parts of the plant that cannot produce their own food, such as the roots.
Which gases are involved in diffusion? Mainly carbon dioxide and oxygen.
How do the cuticle and stomata reduce water loss? The shiny surface on the cuticle reflects heat and stomata open at night when it is less humid, so less water will evaporate.
What are the different parts of a leaf? ed8fe3e6-8890-4755-9f97-ed17bb6f0111.jpg (image/jpg)
What are the purposes for each part of a leaf? Network of veins - transport system for the plant Petiole - holds the leaf so it can face the sun Lamina (leaf surface) - absorbs light to create nutrients Midrib - supports the leaf and is the main part of the transport system Stem - keeps the leaves in the light
How are leaves adapted for efficient photosynthesis? They are: Broad -to absorb as much light as possible Thin - to speed uo diffusion - \(CO_2\) can easily reach the mesophyll Light - so they are able to grow in a certain angle to recieve as much light possible They have veins to transport water and food Upper epidermis - prevent water loss
How does water from the soil reach the leaf? It is absorbed by the roots and carried upwards by the xylem into the midrib, then into the network of veins
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