Wax layer (cuticle) Outer layer. Protection from insects and dehydration.
Upper Epidermis Upper skin layer of the leaf. One cell thick, used for protection.
Palisade Layer Tightly packed layer of photosynthetic cells.
Spongy layer Loosely packed layer of photosynthetic cells. Lots of air space
Leaf vein Enters the leaf at the spongy layer. Brings up water, and takes away food.
List and describe the two types of tube like cells found in the vein: Xylem Water transport cells. Larger cells within the vein. Phloem Food transport cells. Smaller cells within the vein.
13. What is the STOMA? What does it do? A pore in the lower epidermis. It allows water to leave the leaf, and air to enter the leaf.
14. What are the GUARD CELLS and what do they do? One set on each side of the stoma. During drought, the guard cells will swell up and close the stoma so no water can get out. Opens up during wet days.
15. How does water leave the plant? Dribbles out through the stoma.
16. What is Transpiration? The evaporation of water from the surface of the leaf.
17. Considering all the water that is taken in by the roots, how much of this water is lost due to transpiration? 99%
18. What is Turger? Strength due to water pressure. The water moves swiftly through the roots, up the stem and out the leaf. This continuous movement of water gives the plant strength. This is turger.
19. What is Wilting? Due to low amounts of water moving through the plant. Low water pressure causes wilting.
20. Explain how the Stoma and Guard Cells try to keep the plant from wilting: The guard cells close the stoma during dry periods to prevent water loss.
21. Why would you consider a greenhouse an ideal environment for plants to grow?. Yes, it is Warm and wet. Little or no wilting.
22. How did people once believe that plants got their food? From the soil
23. How do plants really get their food? The plants use their chloroplast to manufacture sugar from the elements in their environment. C 6 H 12 O 6
24. What is the food produce produced by the plant? GLUCOSE ( a simple sugar)
25. Why does a plant produce this sugar? The plant builds a sugar molecule to have a place to put the energy that it received from the sun.
26. Why can plants absorb energy from the sun while animals can’t? Plants have chloroplast which contain chlorophyll and animals do NOT have chloroplast.
There is energy in the _SUN_____. The plant ___NEEDS____ this energy! The plant uses its _CHLOROPLAST which is full of __CHLOROPHYLL____ to absorb this energy. The plant needs a place to __STORE_____ this energy. So, it _BUILDS_____ a _SUGAR MOLECULE It needs some RAw materials to build with, so it takes in __CARBON DIOXIDE___________ from the air, And __WATER______ from the _____SOIL_________ through the roots. It combines the __Carbon Dioxide ___ from the _air_____________ with the __water___________ to make this sugar. The unused __oxygen___________ is released into the atmosphere.