Explain why plants need to
photosynthesise and respire
Plants need to photosythesise and respire to
help to plant grow and make new substances.
This is because they use what is around them
to store and make new things. Without this
they wouldn't be able to survive and if they die
out then the humans do to, this is because
there would be no-one to take it our exhaled
carbon dioxide and no-one to give out oxygen,
which is used for breathing.
Write word equations for these
processes
Respiration = Oxygen + Glucose =7 Carbon dioxide + Water
Photosynthesis = Carbon dioxide + Water =7 Oxygen + Glucose
Describe where the raw materials for
these processes come from
Sun, Soil and Air
Describe how water and carbon
dioxide get to leaves
Explain how plant organs and cells are adapted to their functions
Plant organs and cells are adapted to its functions because a vein conting the Xylem and
Phoem, carry the products of photosynthesise so it is good as they are in a network of veins to
travel around the leaf quickely and easily. Also surrounding the Xylem and Phloen, there are
spongy cells called mesopkyil, where there are gaps for gases to go. This is where oxygen
and carbon dioxide and water vapour is exchanged or moved through. The stoma is made up
of two Guard cells and these are incharge of how much water is let out. If there is too much
water Guard cells open up further to let more water vapour out. If the leaves do not haave
enough water ther Guard cells close up to keep the water vapour in.