Question

for questions 15 to 19, read each question carefully. decide which of the choices best completes the statement. place your answer in the blank space given.

1. green plants, algae, and tiny aquatic organisms that convert light energy and store it in the chemical bonds of organic molecules are called

a. consumers
b. herbivores
c. producers
d. primary consumers

1. most people in canada would be classified as

a. carnivores
b. herbivores
c. omnivores
d. producers

1. an energy pyramid differs from a biomass pyramid because

a. the two pyramids are inverted to each other
b. an energy pyramid does not show organisms at each trophic level
c. an energy pyramid has fewer organisms at the top trophic level
d. an energy pyramid shows the amount of energy at each trophic level, while a biomass pyramid shows the mass transferred at each trophic level

1. a food web is different from a food chain because a food web

a. does not begin with producers
b. shows the various trophic levels
c. does not show what each organism eats
d. is made up of various food chains that are part of an ecosystem

1. a northern pike is considered to be a tertiary consumer because

a. it eats algae
b. it is such a large organism
c. it eats primary consumers such as snails
d. it eats other organisms, such as frogs and other fish, that eat secondary consumers

Explanation:

• Question 15: Producers are organisms (like green plants, algae, and some aquatic organisms) that convert light energy into chemical energy (stored in organic molecules) through photosynthesis. Consumers (A, D) eat other organisms, and herbivores (B) are a type of consumer that eats plants.
• Question 16: Omnivores eat both plants and animals. Most people in Canada eat a diet that includes both plant - based (e.g., fruits, vegetables) and animal - based (e.g., meat, dairy) products. Carnivores (A) eat only animals, herbivores (B) eat only plants, and producers (D) make their own food.
• Question 17: A biomass pyramid shows the mass of organisms at each trophic level, while an energy pyramid shows the amount of energy transferred at each trophic level. They are not inverted relative to each other in a general sense (A is wrong). Energy pyramids do show organisms at each trophic level (B is wrong), and having fewer organisms at the top trophic level is a characteristic of both pyramids in some cases (C is not the key difference).
• Question 18: A food web is a complex network that shows the various food chains (what each organism eats) in an ecosystem. A food chain is a simple linear sequence. Both food webs and food chains begin with producers (A is wrong), and both show trophic levels (B is wrong).
• Question 19: A tertiary consumer is an organism that eats secondary consumers. Eating algae (A) would make it a primary consumer. Size (B) is not the determining factor. Eating primary consumers (C) would make it a secondary consumer.

Answer:

1. C. producers
2. C. omnivores
3. D. an energy pyramid shows the amount of energy at each trophic level, while a biomass pyramid shows the mass transferred at each trophic level
4. C. does not show what each organism eats
5. D. it eats other organisms, such as frogs and other fish, that eat secondary consumers