Photosynthesis and Ecosystem Dynamics

The video reviews primary production, focusing on how plants and other organisms convert energy into food, forming the base of the food pyramid. It explains the energy transfer between trophic levels, highlighting the 10% energy transfer rule. The role of autotrophs in photosynthesis is detailed, including the chemical process and the importance of chloroplasts. The video concludes with a summary of energy use in ecosystems and the necessity of autotrophs for sustaining life.

What is the primary role of primary producers in an ecosystem?

• To consume other organisms

• To provide shelter for animals

• To convert energy into food

• To decompose organic matter

Why is the energy transfer between trophic levels only 10%?

• Energy is converted to light

• Energy is used for growth

• Energy is lost as heat

• Energy is stored in the soil

What are autotrophs capable of doing?

• Decomposing organic matter

• Producing energy from sunlight

• Consuming other organisms

• Providing nutrients to soil

Which of the following is a product of photosynthesis?

• Carbon dioxide

• Oxygen

• Sulfur

• Nitrogen

Where does the light-dependent reaction of photosynthesis occur?

• In the stroma

• In the thylakoid membrane

• In the cytoplasm

• In the mitochondria

What is the main pigment involved in capturing light for photosynthesis?

• Carotene

• Xanthophyll

• Chlorophyll

• Anthocyanin

What is the role of NADPH in photosynthesis?

• To store energy as ATP

• To absorb sunlight

• To transport electrons

• To provide structural support

Which phase of photosynthesis does not require light?

• Light-dependent reactions

• Light-independent reactions

• Photorespiration

• Photolysis

What is the main purpose of the Calvin cycle?

• To break down water molecules

• To produce oxygen

• To convert light energy into chemical energy

• To synthesize glucose

What is the significance of chloroplasts in photosynthesis?

• They release oxygen

• They store energy

• They absorb carbon dioxide

• They contain chlorophyll