Which of the following is not a characteristic of parasitic helminths?

• A. They have a complex life cycle.
• B. They often have specialized attachment structures.
• C. They are multicellular organisms.
• D. They are photosynthetic.

Answer: (D)

Verified step by step guidance

1. Understand the characteristics of parasitic helminths: Parasitic helminths are a group of worms that live inside a host organism, deriving nutrients at the host's expense. They are known for having complex life cycles, often involving multiple hosts, and specialized structures for attachment to their hosts.
2. Recognize that parasitic helminths are multicellular organisms: These organisms are composed of multiple cells, which is a common trait among helminths, distinguishing them from unicellular parasites like protozoa.
3. Identify the role of specialized attachment structures: Parasitic helminths often have hooks, suckers, or other structures that allow them to attach securely to the host's tissues, which is crucial for their survival and reproduction.
4. Consider the process of photosynthesis: Photosynthesis is a process used by plants, algae, and some bacteria to convert light energy into chemical energy. It involves the use of chlorophyll to capture light energy, which is not a characteristic of parasitic helminths.
5. Conclude that parasitic helminths are not photosynthetic: Since parasitic helminths live inside their hosts and rely on them for nutrients, they do not perform photosynthesis. This distinguishes them from organisms that can produce their own food through light energy.