Chapter 3 Section 3

Question 1

Why do living things need energy?

Answer 1

To carry out the cells function

Question 2

what is photosynthesis

Answer 2

the process by which a cell captures energy is sunlight and uses it to make food

Question 3

organisms that make their own food is called an

Answer 3

autotroph

Question 4

an organism that cannot make their own food is called a

Answer 4

heterotroph

Question 5

what is the first stage of photosynthesis?

Answer 5

stage 1

(1) Chloroplasts captures sunlight
(2) chlorophyll absorbs the sunlight

Question 6

What is the 2nd stage of photosynthesis?

Answer 6

1. roots absorb water
2. stomata takes in carbon dioxide
   3 water and carbon dioxide meet in the chloroplast and undergo chemical reactions powered by the energy captured in the first stage
3. these chemical reactions produce oxygen and glucose
4. the oxygen exits through the stomata and the glucose is used to carry out cell functions

Question 7

what is the energy captured in the first stage used for?

Answer 7

to power the second stage of photosynthesis

Question 8

how are roots and stomata important in photosynthesis?

Answer 8

roots absorb water and stomata take in carbon dioxide which is important for photosynthesis

Question 9

what role to you think the guard cells play?

Answer 9

they regulate what goes in and out of the stomata

Question 10

when do you think the stomata are usually open?

Answer 10

daytime because there is sunlight during the day when light energy is available for photosynthesis