Unit 1🧡 Flashcards
What is the function of the waxy cuticle in a leaf?
Stops water leaving the leaf through the epidermis
The waxy cuticle helps to reduce water loss, maintaining hydration within the leaf.
What is the role of the upper epidermis in leaves?
Protection
The upper epidermis acts as a barrier against physical damage and pathogens.
What is the primary function of the palisade layer in leaves?
Packed with many chloroplasts for photosynthesis
The palisade layer is crucial for maximizing light absorption.
What is the function of the spongy layer in leaves?
Has many air spaces which increase the surface area for efficient gas exchange
The spongy layer facilitates the diffusion of gases like oxygen and carbon dioxide.
What do xylem and phloem vessels carry in a leaf?
- Xylem: carries water and dissolved minerals
- Phloem: carries sucrose and amino acids
These vascular bundles are essential for nutrient transport within the plant.
What are guard cells and their function?
Banana shaped cells which open and close to form a small hole in the leaf for gas exchange
Guard cells regulate the size of stomata, controlling gas exchange and transpiration.
What is the name for the hole formed between guard cells?
Stomata
Stomata are crucial for allowing gases in and out of the leaf.
What is the word equation for photosynthesis
Carbon dioxide +water (with light energy and chlorophyll) =glucose +oxygen
How does carbon dioxide get into the plant
Into leaves through stomata
How does water get into plants
Roots
Where does glucose come out of the plant from
To various places
How does the oxygen leave the plant
Via the stomata
Obverstations from nail varshi thing
There were many more stomata present on the underneath of the leaf
How are the leaves adapted for dissfusion and photosynthesis
Lots of stomata;leaves are thin for a short diffusion pathway
What happens if a plant loses to much water
Wilts
When is the stomata open and closed
Open=daytime
Closed=nighttime
What is photosynthesis
Using light energy to make food
What are some of the uses of glucose produced in photosynthesis
Respiration;lipids;cellulose;protein:starch
Steps to find out if a leaf for starch
Step 1: boil leaf in water to soften it and kill cells.
Step 2: boil leaf in ethanol to breakdown chlorophyll
Step 3: rinse leaf in water to remove ethanol
Step 4: test with iodine
How you test for the presence of oxygen
Use a glowing splint it reglows light
Three factors that affect the rate of photosynthesis
Light intensity
Concerns of carbon dioxide
Temperature
What is the role and deficiency symptom NITRATE
For healthy growth, to
make proteins
Poor growth
Older leaves are yellow
PHOSPHROUS
For healthy roots Poor root growth
Younger leaves are purple
POTASSIUM
For healthy and leaves and
flowers
Yellow leaves with dead
patches
MAGNESIUM
For making chlorophyll Plants turn yellow
