What is a correct ecological definition?
A) A community is a group of organisms of one species living in the same area.
B) An ecosystem is a community of organisms and their environment interacting together.
C) A population is a group of different species living together.
D) A species is all of the different organisms living in a community.
▶️ Answer/Explanation
Ans: B
Ecosystem (B) is correctly defined as a biological community interacting with its physical environment. This is the only accurate definition among the options.
Why others are incorrect:
– A: Community includes multiple species, not just one.
– C: Population refers to one species, not multiple.
– D: Species refers to organisms that can interbreed, not all organisms in a community.
Energy transfers in an ecosystem are listed.
Which transfers are correct?
A) 1,2 and 3
B) 1 and 2 only
C) 1 and 3 only
D) 2 and 3 only
▶️ Answer/Explanation
Ans: A
All three energy transfers shown are correct in ecosystems: (1) Light to producers via photosynthesis, (2) Producers to primary consumers through feeding, and (3) Primary to secondary consumers in the food chain.
These represent the fundamental energy flow through trophic levels, making A (1, 2 and 3) the correct answer. Energy is never created or destroyed, just transferred between organisms.