Lesson 3 gas exchange whats new pre activity 1

Lesson 3: Gas Exchange

What’s new (Pre-activity)
1. Identify the Organs of the Respiratory System and its functions.
2. Identify the Plant structures responsible for gas exchange and its functions.
What I’ve learned (Multiple choices)
1. Which of these is the correct equation for photosynthesis?
2. Which gas is released when plant cells respire aerobically?
a. Oxygen b. Carbon dioxide c. Nitrogen
3. When does respiration happen in plants? 4. There is an overall uptake of carbon dioxide and release of oxygen by a plant
under certain conditions. Which statement about such a plant is correct?
5. How do plants obtain the carbon dioxide they need for photosynthesis? 6. Which of these is an adaptation of leaves for efficient gas exchange?
a. Tightly packed spongy mesophyll cells
b. A waxy cuticle on the upper surface of the leaf
c. Tiny pores, called stomata, in the lower epidermis
7. What happens to stomata in the light?
8. When is the movement of carbon dioxide, oxygen and water vapour at the
surface of the leaf likely to be greatest?