B4///2 Flashcards
What is epidermal tissue
Tissue which covers the plant
What does palisade mesophyll contain
Lots of chloroplast
What does palisade mesophyll do
traps light for photosynthesis
What does spongy mesophyll have
Many stomata and large surface area
Why does spongy mesophyll have a large surface area and many air spaces
To carry out diffusion of gases
Give 3 examples of plant organs
Stems roots and leaves
Practice labelling a leaf
Practice labelling a leaf
What is translocation
Phloems carry sugars from the leaves to rest of plant
What are stomata
Tiny holes in a leaf where gas diffuse in and out of
What control stomata
Guard cells
What is transpiration
when water evaporates from the cells in the leaf into the air spaces between them and then diffuses out of the plant through the stomata
What are some factors affecting transpiration
Temperature
Humidity
Light intensity
What does a magnesium deficiency do to a plant
Chlorosis- lack of chloroplast
What colour is a plant lacking magnesium
Yellow leaves
What does a nitrate deficiency do to a plant
Stunted growth as nitrates are needed for protein synthesis
What happens to a cell with turgor pressure
Cell becomes rigid
what is flaccid
when guard cells lose too much water so they close the stomata
why are stomata on the bottom of the leaf and close during the night
it is more shaded on the bottom so is less likely to lose water and the guard cells are sensitive to light
how can we investigate the effect of pH on amylase
place iodine into spotting wells and take 3 test tubes and add starch to the first, amylase to the second and pH buffer in the third. then place all test tubes into a water bath at 30 degrees for 10 mins and combine them with a stirring rod.
