Internal & External structures of leaves


Time elapsed : 30 min.
Highest mark : 10
Least mark : 0
Mark round : 1


Question 1:
Make a list of all those features of green plants in general which help the leaves to get as much light as possible.


Question 2:
Each word in list A is related to one word list B below. For each word in list A write down the appropriate matching word from list B.

LIST A			

stomata			

vessels			

chloroplasts	

air spaces			



List B

carbon dioxide

light

water

chlorophyll



b. What do the four words in column A have in common?

c. What do the four words in list B have in common?


Question 3:
3. Why is the lower side of a leaf has a paler green than the upper side of the leaf?


Question 4:
Why do palisade mesophyll cells contain more chloroplast than the spongy mesophyll cells?


Question 5:
What part is played by each of these structures in photosynthesis:

a. the xylem?

b. the stomata?

c. the air spaces in the spongy mesophyll?



Ref. Roberts, M.B.V. (1986) Biology for life  Thomas Nelson & sons Ltd. p.243

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