plant cell organisation

epidermal tissue: covers the whole plant

helps reduce water loss by evaporation

upper epidermis is transparent so light can pass through

palisade mesophyll tissue: where photosynthesis occurs

lots of chloroplasts

at the top of the leaf to get most of the light

spongy mesophyll tissue: contains air spaces to allow gas diffusion in/out of cells

xylem and phloem: transports water + mineral ions through plant

takes away glucose made from photosythesis

transpiration+translocation:

phloem-

transports food substances made in leaves

transports it to rest of plant for immediate use

called translocation

xylem-

made of dead cells

carry water/mineral ions up plant

called transpiration stream

transpiration is the loss of water from a plant:

1. water from inside leaf evaporates and diffuses out of leaf

2. creates slight storage of water in the leaf

3. more water drawn up from rest of plant

4. more water is drawn up from roots and creates transpiration stream

stomata:

the more light, the higher the transpiration rate

when warm, water particles have more energy to evaporate and diffuse out of the stomata…