Photosynthesis and Ecosystems Flashcards
7 cards from real BECE practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Photosynthesis and Ecosystems flashcards as text
Which part of the chloroplast is the primary site of the light-dependent reactions of photosynthesis?
Answer: Thylakoid membrane
The light-dependent reactions occur on the thylakoid membrane, where chlorophyll pigments absorb sunlight.
What gas is released as a byproduct of the light-dependent reactions in photosynthesis?
Answer: Oxygen
Oxygen is released when water molecules are split (photolysis) during the light-dependent reactions.
In a food chain, which organism converts solar energy into chemical energy?
Answer: Producer
Producers (plants and algae) perform photosynthesis, converting solar energy into chemical energy stored in glucose.
A hawk eats a snake that ate a frog that ate a grasshopper that ate grass. The hawk is at which trophic level?
Answer: Fifth
Grass (1st) → grasshopper (2nd) → frog (3rd) → snake (4th) → hawk (5th trophic level).
Which pigment in plants absorbs light energy most efficiently for photosynthesis?
Answer: Chlorophyll
Chlorophyll is the primary photosynthetic pigment that absorbs red and blue light most effectively.
What is the role of NADPH produced during the light reactions of photosynthesis?
Answer: It carries electrons to the Calvin cycle
NADPH acts as an electron carrier, transporting high-energy electrons from the light reactions to the Calvin cycle.
Which of the following best describes a 'niche' in an ecosystem?
Answer: The total role an organism plays including what it eats and how it interacts
A niche includes an organism's habitat, diet, behavior, and all interactions — it is the organism's functional role in the ecosystem.