chapter 2 review explain

what causes the leaf to change colors in autumn?

the pigments in leaves.

how do guard cells help conserve water?

they stop the stoma from losing too much water.

explain the purpose of xylem and phloem?

to move nutrition around the plant

what is the purpose of cork tissue?

to protect and waterproof a plant

what is the purpose of parenchyma tissue?

to store food

state the purpose of vacuoles

to store the food, fluid substances, and minerals.

explain the leaf's epidermis

covers the leaf on top and bottom of a leaf. it protects the leaf

what is the purpose of leaf veins?

leaf veins are vital to plants because they carry nutrients to the whole leaf.

how are sessile leaves different from ordinary leaves?

sessile leaves have no petiole.

how are compound leaves different from simple leaves.

simple leaves have no leaflets. they are complete. compound leaves have lots of leaflets.