Green algal comparison: In basic phycology, Chlamydomonas and Volvox are considered similar for which shared features relevant to laboratory identification and classification?

Introduction / Context:
Introductory courses emphasize how different green algae share core traits despite differences in complexity. Chlamydomonas is a motile unicell, whereas Volvox is a motile colonial form. Recognizing their similarities aids in understanding evolutionary transitions from unicellular to colonial life.

Given Data / Assumptions:

• Both taxa are green algae studied in teaching labs.
• We consider motility and taxonomic placement.
• Standard Chlorophyta traits such as chlorophyll a and b and starch storage apply.

Concept / Approach:
Chlamydomonas cells possess two anterior flagella and a photosensitive eyespot, enabling active swimming. Volvox forms spherical colonies of many biflagellate cells embedded in a gelatinous matrix, with coordinated beating that produces rolling motility. Both contain chlorophylls a and b, store starch, and are assigned to the green algal division Chlorophyta in traditional curricula.

Step-by-Step Solution:
Confirm motility: both lineages possess flagella and exhibit active movement.Confirm taxonomy: both are green algae within Chlorophyta.Evaluate options: both statements are true, so select the combined option.Note differences: unicellular versus colonial organization, which do not change the correct answer.

Verification / Alternative check:
Microscopy shows two flagella per Chlamydomonas cell and numerous biflagellate cells in Volvox colonies, with chlorophyll a and b visible under appropriate filters.

Why Other Options Are Wrong:

• Only motility or only Chlorophyta is incomplete because both statements are correct.
• None of these is incorrect because at least two statements are true.

Common Pitfalls:
Assuming Volvox is nonmotile because the colony seems large; in fact, colonies swim efficiently due to coordinated flagella.

Final Answer:
Both (a) and (b)