Get out your notebook and label the page “Plant Survival” Get out your notebook and label the page “Plant Survival”. Then discuss the following questions with your neighbors: What might kill a plant? What helps a plant survive? *Test is Tuesday December 20th – (if you want be here you need to take it before you leave)

Changes in environmental conditions can affect the survival of individual organisms and entire species. Plants have mechanisms that enable them to respond to their environment. Plants grow, reproduce, and shift the position of their roots, stems and leaves in response to environmental conditions such as gravity, sunlight, temperature and day length

TROPISMS AND OTHER RESPONSES AND ADAPTATIONS HELP PLANTS SURVIVE.

DEFINITION Tropism: bending toward or away from a stimulus “Trop” the Greek word for turning “ism” means the act of

“trop” turning “ISM” THE ACT OF + = “trop” turning “ism” the act of

Flash = Stimulus Blink = Response Response and Stimulus Anything in the environment that produces a response is called a stimulus. Example: A camera’s flash goes off… Your eyes blink… Flash = Stimulus Blink = Response

Three Types of Tropisms HYDROTROPISM: response to water Example: a plant’s roots grow towards a water source

Three Types of Tropisms GRAVITROPISM: response to gravity Example: a plant’s roots go down

Three Types of Tropisms PHOTOTROPISM: response to light Example: a plant’s stem bends toward the sun

Tropism Time Lapse Compliation https://www.youtube.com/watch?v=F3Oj2er-91s

Auxins Plants chemicals that help the plant grow Auxins cause the plant to bend during all kinds of tropisms When one side of the plant is exposed to light, the auxins move to the other side and down. Cells then grow, which makes the plant bend.

Dormancy Dormancy is a period of inactivity in a mature seed prior to germination seed remains dormant until conditions are favorable for growth and development of the new plant.

Recap Video and Song https://www.youtube.com/watch?v=pi3P3uJOsN4 https://www.youtube.com/watch?v=uX5eoxKbzHE

What are the three types of tropisms? Review Questions What is a tropism? Bending toward or away from a stimulus What is a stimulus? Anything in the environment that produces a response What are the three types of tropisms? gravitropism, phototropism, hydrotropism

What chemical causes plants to bend? Review Questions What is gravitropism? response to gravity What is phototropism? response to light What is hydrotropism? response to water What chemical causes plants to bend? auxins

Seed Dispersal Handout and Article Video to watch after reading article: https://www.youtube.com/watch?v=aG5G4VW-1XI

Please get out your seed dispersal sheet from yesterday Please get out your seed dispersal sheet from yesterday. We will begin by watching the accompanying video. Also, grab the sheet from the desk and begin reading over your lab for today.

Take the next couple of minutes to work on your lab sheet from yesterday. Then we will be going to the computer lab. Bring all of your stuff.

Test tomorrow! Grab the study guide from the desk and begin looking over the questions. Put a star by the questions you do not know the answer to

Test day! Clear everything off of your desk except a pencil. Grab a testing divider Have something to do after testing, like reading a book