Question

1. what is the basis of all energy in the ecosystem?

a. the grasses
b. the bee
c. the water
d. the sun

1. where do all humans get their food from? choose all that are correct.

a. animals
b. sun
c. plants
d. air

1. why do organisms need energy that they make from food?

a. growth
b. movement
c. cell repair
d. reproduction
e. all of the above

1. what happens to the amount of energy being passed on in the food chain as shown in the energy pyramid?

Explanation:

• Question 31: In an ecosystem, the sun is the ultimate source of energy. Producers (like plants) use sunlight for photosynthesis to convert light energy into chemical energy. This energy then flows through the food chain (primary consumers, secondary consumers, tertiary consumers). Grasses (producers) use solar energy. Bees (primary consumers) get energy from plants (which used solar energy). Water is not an energy source. So the sun is the basis of all energy.
• Question 32: Humans are heterotrophs. They get food from animals (e.g., meat, dairy) and plants (e.g., fruits, vegetables). The sun is an energy source but not directly food. Air is needed for respiration but not food.
• Question 33: Organisms need energy for growth (increasing in size and cell number), movement (e.g., muscle contraction), cell repair (replacing damaged cells), and reproduction (producing offspring). So all these processes require energy from food.

Answer:

• 31. D. The sun
• 32. A. Animals, C. Plants
• 33. E. All of the above