BECE Photosynthesis and Ecosystems 2

Question 1

Which part of the chloroplast is the primary site of the light-dependent reactions of photosynthesis?

Accepted Answer

Thylakoid membrane

Answer

The light-dependent reactions occur on the thylakoid membrane, where chlorophyll pigments absorb sunlight.

Question 2

What gas is released as a byproduct of the light-dependent reactions in photosynthesis?

Accepted Answer

Oxygen

Answer

Oxygen is released when water molecules are split (photolysis) during the light-dependent reactions.

Question 3

In a food chain, which organism converts solar energy into chemical energy?

Accepted Answer

Producer

Answer

Producers (plants and algae) perform photosynthesis, converting solar energy into chemical energy stored in glucose.

Question 4

A hawk eats a snake that ate a frog that ate a grasshopper that ate grass. The hawk is at which trophic level?

Accepted Answer

Fifth

Answer

Grass (1st) → grasshopper (2nd) → frog (3rd) → snake (4th) → hawk (5th trophic level).

Question 5

Which pigment in plants absorbs light energy most efficiently for photosynthesis?

Accepted Answer

Chlorophyll

Answer

Chlorophyll is the primary photosynthetic pigment that absorbs red and blue light most effectively.

(BECE) Basic Education Certificate Examination Practice Test