Grade 7 Unit 03: Plant Systems and Homeostasis

1. 1. Describe turgor pressure. What are some examples?
2. 2. When a seed germinates underground (in the dark) how does it orient itself so that the stem grows up, and the roots grow down?
3. 3. Know the structural hierarchy from Cells to organisms.
4. 4. What is auxin? How does auxin benefit plants?
5. 5. Match the energy conversion with the correct example.


6. For numbers 1-7: write in the blank the word that best fits the sentence.

   Phototropism

   Gravitropism

   Turgor pressure

    

   1.   A dry seed expands with water until it busts it seed coat. ______________________

   2.   An oak tree grows at an angle to get more light. _____________________

   3.   Sandra soaks her wilted lettuce in water to make it crisp again ________________

   4.   A seed germinates underground and its roots grow down, and its stem grows up. _________________

   5.   This is caused by water being sucked into the vacuole of a plant causing the cell to push its cell membrane against the cell wall. __________________

   6.   When plants germinate underground, they must sense which way to grow.  The plant’s sensitivity to gravity allows the roots to grow down and the stem to grow up, even in the absence of light. ________________

   7.   The hormone auxin speeds the rate a plant grows.  Auxin accumulates in the shaded parts of the plants. _____________________