BIOLOGY - Plant Biology - Photosynthesis and Respiration

The video tutorial explores the carbon cycle, focusing on how carbon dioxide is absorbed by plants and used in photosynthesis to create oxygen and carbohydrates. It explains the process of respiration, where oxygen and carbohydrates are converted back into carbon dioxide and water, releasing energy. The role of enzymes and chlorophyll in these processes is discussed, along with a comparison between respiration and combustion. The tutorial highlights the importance of these reactions in sustaining life and the potential for green energy solutions.

What percentage of carbon dioxide was present in the air before the use of fossil fuels?

• 0.38%

• 0.04%

• 0.28%

• 0.18%

What is the primary pigment involved in photosynthesis?

• Xanthophyll

• Anthocyanin

• Carotene

• Chlorophyll

Which process allows living organisms to release energy by reversing photosynthesis?

• Combustion

• Photosynthesis

• Respiration

• Fermentation

Where do the series of reactions in respiration take place within cells?

• Ribosomes

• Mitochondria

• Nucleus

• Chloroplasts

What do roots and seeds require to obtain energy in the absence of sunlight?

• Carbon dioxide

• Nitrogen

• Hydrogen

• Oxygen

What is the similarity between respiration and combustion?

• Both require sunlight

• Both produce carbohydrates

• Both occur in chloroplasts

• Both release energy

What is the challenge scientists face in using sunlight to create fuel?

• Finding a better catalyst than chlorophyll

• Increasing the amount of carbon dioxide

• Enhancing water absorption

• Reducing oxygen levels