Question

11
which of the following shows the correct level of organization in order of
increasing complexity?

molecule, atom, cell, organ system, ecosystem
atom, molecule, organ, population, ecosystem
ecosystem, individual, organ, cell
organelle, tissue, organ, community, population
molecule, cell, organelle, individual, community

Explanation:

To determine the correct order of biological organization (from least to most complex), we recall the hierarchy: atom (basic unit of matter) → molecule (atoms bonded) → organ (part of an organism) → population (group of same species) → ecosystem (communities + environment). Let's analyze each option:

• First option: Atom is simpler than molecule, so "molecule, atom..." is wrong.
• Second option: Follows atom → molecule → organ (part of individual) → population (group of individuals) → ecosystem (includes populations + environment), which is correct.
• Third option: Ecosystem is more complex than individual, so "ecosystem, individual..." is reversed.
• Fourth option: Population is part of community (community is more complex than population), so "community, population" is reversed.
• Fifth option: Organelle is part of cell (cell is more complex than organelle), so "molecule, cell, organelle..." is wrong.

Answer:

B. atom, molecule, organ, population, ecosystem