Use the Following Information to Answer the Question

question 59

Multiple Choice

Use the following information to answer the question.
Healthy individuals of Paramecium bursaria contain photosynthetic algal endosymbionts of the genus Chlorella. When within their hosts, the algae are referred to as zoochlorellae. In aquaria with light coming from only one side, P. bursaria gather at the well-lit side, whereas other species of Paramecium gather at the opposite side. The zoochlorellae provide their hosts with glucose and oxygen, and P. bursaria provides its zoochlorellae with protection and motility. P. bursaria can lose its zoochlorellae in two ways:
(1) if kept in darkness, the algae will die; and (2) if prey items (mostly bacteria) are absent from its habitat, P. bursaria will digest its zoochlorellae.
The motility that permits P. bursaria to move toward a light source is provided by ________.

• A) pseudopods
• B) a single flagellum featuring the 9 + 2 pattern
• C) many cilia
• D) contractile vacuoles

---

Definitions:

Sweatshops

Workplaces, often in the clothing industry, with very poor, socially unacceptable working conditions, frequently involving the exploitation of workers.

Hazardous Chemicals

Substances that pose a risk to health, safety, or the environment, requiring careful handling, storage, and disposal to prevent harm.

Sewing Machines

Mechanical or electronic devices used to stitch fabric or other materials together.

Trade Deficit

A situation where a country's imports exceed its exports during a specific period, leading to a net outflow of domestic currency to foreign markets.