Question

Structure used for locomotion in Euglena is
A. Aplanospores
B. Flagella
C. Podia
D. All of the above

Answer 1

Hint: Some structures help the organism whether single-cell or multicellular to move in the liquid. This could either be done passively or actively. Locomotion is important for an organism to travel to other places. It can defend itself from the predators.

Complete answer:
Euglena is a single-celled flagellate eukaryotic freshwater organism. The one cell body has all the functions of respiration, digestion, excretion, locomotion etc. they can move on their own with a locomotory structure.
Locomotion means movement. So the structures that help the organisms to move are the locomotory structures.

Let us see which of them I the Euglena helps them to move.
> Option A: Aplanospores: These are the asexual, non-motile spores in algae. They form the new cell from the parent cell-like zoospores. They have to depend on passive transport by water currents to move.

> Option B: Flagella: It is the long whip-like structure that is made of microtubules. The help to propel cells to move. In eukaryotic, it moves in the ‘S’ motion. It is also a sensory organelle.

> Option C: Podia: These are the projections to the oral cavity in the echinoderms. They help them to feed.

Hence, The correct answer is option (B).

Note: Flagella is made of microtubules, an extension of the plasma membrane. They give the cell motility by whipping themselves. These filamentous structures are proteinaceous and found on bacteria mainly. It has other functions also like being sensitive to chemicals, temperatures etc. so this will help the euglena to stay away from those areas.