Topic 5 - Exam Questions

Question 1

Deduce the effect of succession on the level of carbon dioxide in the atmosphere (3 Marks)

Answer 1

~ Net primary productivity continues.

~ As succession increases, more photosynthesis occurs, removing levels of carbon dioxide.

~ Therefore decreasing levels of carbon dioxide in the atmosphere.

Question 2

(3 Marks)

Answer 2

~ Both have four limbs, rather than fins.

~ Acanthostega has a more streamlined body shape.

~ Acanthostegas tail is more fin-like, meaning it may be more adapted for swimming.

Question 3

Other than the fossil record, state TWO sources that provide evidence for evolution (2 Marks)

Answer 3

~ Development of antibiotic resistance in bacteria.

~ Molecular evidence.

Question 4

Describe how oxygen is produced (4 Marks)

Answer 4

~ Made from H20.

~ Through the photolysis of water.

~ H20 -> 2H+ + 1/2 O2.

~ Which occurs in the chloroplast.

Question 5

Describe how starch is formed from the products of the LIR of photosynthesis (4 Marks)

Answer 5

~ 2x GALP, produces glucose.

~ Glucose molecules joined together by glycosidic bonds to form starch.

~ Via condensation reactions.

~ Producing amylose and amylopectin.