unit 2 – plants – study guide for posttest



Be able to explain, define and/or apply the following words and concepts.


controlled experiment qualitative observation quantitative observation photosynthesis stomata leaves glucose chlorophyll stages of life cycle of Brassica plant roots germination pollination xylem phloem 


An experiment in which only one variable is changed while the others are kept the same. Observations made using the five senses and told using words, such as a leaf is green and shiny. Measurements made using numbers and units, such as a leaf is 7 cm long. The process in which plants make their own food using light, water and carbon dioxide, producing glucose (a sugar) and oxygen. Openings in leaves that allow carbon dioxide in and oxygen out. Where photosynthesis occurs in a plant (food factory for the plant). The sugar produced in photosynthesis; used as food for the plant, can be changed to starch. The green coloring in plant leaves that traps light energy and helps the chemical reaction of photosynthesis to occur. The plant begins as a seed, germinates to form roots, produces a stem, then leaves, flower buds, and seed pods that allow the cycle to begin again. Three jobs: absorb water from the soil, hold the plant in place, and absorb minerals. The process in which a seed softens in soil and has a root begin to grow, the start of a new plant. The process in which a pollinator (like an insect or bird) transfers pollen from the anther of one flower to the stigma of a different plant’s flower. Tube-like tissue that carries water and nutrients to every part of a plant; always flows upwards. Tube-like tissue that carries sugar to every part of a plant; can flows downward mainly but can flow upward to reach all parts of the plant.

transpiration tropism

Life Cycle of a Plant in Pictures

Seeds go into the soil. Fruit or seed pod grows. The process in which leaves pull water up through the plant, by evaporating water off the leaves and pulling more up to replace it. The turning of a living thing in a particular direction, in response to a stimulus (action that gets the living thing’s attention). Three main types of tropism In plants:  Geotropism – Plant grows in response to gravity (roots grow down; stem grows up).  Hydrotropism – Plant grows toward water (like roots growing toward moisture).  Phototropism – Plant grows toward light (helps leaves get best position to get light for photosynthesis to occur). Roots grow down Into soil. Stem and leaves grow. Pollination must occur.