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A geranium gets the water needed to survive through its __________.


Carbon dioxide enters a plant through its __________.


The outer layer of a leaf is called the __________.


Small openings on the epidermis of plant leaves are called __________.


When a plant is losing too much water, it can __________ its stomata.


The reason most plant leaves look green is because of __________ in their cells.


You are outside admiring the flowers on a rose bush. Looking at the green leaves, the green light is __________ from chlorophyll.


The process where light energy is trapped in a plant's chlorophyll and produces sugars is called __________.


Chlorophyll and other pigments are involved in __________.

light-dependent reactions

Carbon dioxide is involved in __________.

light-independent reactions

Plant photosynthesis helps humans because __________.

the process adds oxygen to the atmosphere

Aerobic respiration takes place in which organelle?


__________ is the process that breaks down food molecules and releases energy.


Respiration is important to most organisms because __________.

food energy is converted into a form for cell use

Photosynthesis is a plant process used to __________.

store energy

You duck your head when a baseball is thrown toward your face. You are responding to __________.

an external stimulus

A plant's response to touch is called __________.


A vine growing up the wall outside your classroom is an example of a response to __________.

negative gravitropism

Positive phototropism can cause plant leaves to change growing patterns and __________.

grow towards a light source

Which of these is NOT a hormone that affects plant growth?


Auxin is a hormone that causes plants to respond to __________.

positive phototropism

The hormone that promotes faster cell division in plants is called __________.


The hormone that helps plants conserve water is __________.

abscisic acid

Spinach is a plant that needs short nights to flower. It is a __________ plant.


You are traveling in Costa Rica and see many lettuce plants growing in fields. You conclude that lettuce is __________.

a long-day plant

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