Energy and Metabolism in Organisms

The video explains metabolism as the chemical processes in organisms that convert food into energy. It introduces the First Law of Thermodynamics, stating energy is neither created nor destroyed. The video illustrates this law through photosynthesis, where plants convert sunlight into energy, and how animals and humans further convert this energy through digestion and cellular processes.

What is the primary function of metabolism in organisms?

• To create new energy

• To destroy excess energy

• To store energy indefinitely

• To convert food into usable energy

Which principle states that energy cannot be created or destroyed?

• The Second Law of Thermodynamics

• The Law of Conservation of Mass

• The First Law of Thermodynamics

• The Law of Gravity

What type of energy does the sun provide that is used in photosynthesis?

• Thermal energy

• Mechanical energy

• Chemical energy

• Radiant energy

What is the main product of photosynthesis that is crucial for life on Earth?

• Carbon dioxide

• Oxygen

• Nitrogen

• Methane

What is starch primarily composed of?

• Lipids

• Amino acids

• Glucose molecules

• Proteins

How do animals utilize the energy stored in plants?

• By releasing it as heat

• By converting it into proteins

• By storing it as fat

• By converting starch into glucose

What is the role of glucose in animal cells?

• To provide structural support

• To store genetic information

• To supply energy for growth and milk production

• To act as a waste product

What happens to food during human digestion?

• It is converted into light energy

• It is turned into water

• It is broken down into atoms

• It is stored as starch

Which molecules contain nitrogen atoms?

• Carbohydrates

• Fats

• Proteins

• Glucose

What is the ultimate purpose of energy conversion in humans?

• To create new energy

• To maintain life and health

• To destroy excess energy

• To store energy indefinitely