1) How do gases move in and out of the leaf? a) osmosis b) diffusion c) active transport d) energy 2) Which organelle does a plant cell have that an animal cell does not? a) cell wall b) cell membrane c) nucleus d) mitochondria 3) What allows the stomata to open and close? a) palisade cells b) tissues c) chlorophyll d) guard cells 4) Which gas is taken in through the stomata? a) oxygen b) carbon dioxide 5) What is diffusion? a) movement of particles from an area of low to high concentration b) particles moving around in all concentrations c) movement of particles from an area of high to low concentration d) particles moving from one concentration to another 6) What gives a leaf its green colour? a) chlorophyll b) stomata c) palisades d) guard cells 7) The upper epidermis layer is........ a) thick and transparent b) thin and transparent c) thick and opaque d) thin and opaque 8) What happens to water on the surface of a leaf? a) condensation b) freezing c) melting d) evaporation

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