Which of the following is a characteristic feature of foraminifera?

• A. They are photosynthetic prokaryotes
• B. They lack a nucleus
• C. They reproduce exclusively by binary fission
• D. They possess shells made of calcium carbonate

Answer: (D)

Verified step by step guidance

1. Step 1: Understand what foraminifera are. Foraminifera are a group of amoeboid protists characterized by their intricate shell structures.
2. Step 2: Recall the cellular organization of foraminifera. They are eukaryotic organisms, meaning they have a true nucleus, so they do not lack a nucleus.
3. Step 3: Consider their mode of reproduction. Foraminifera reproduce through various methods, including sexual and asexual reproduction, but not exclusively by binary fission.
4. Step 4: Examine their metabolic capabilities. Foraminifera are not photosynthetic prokaryotes; they are eukaryotes and do not perform photosynthesis like cyanobacteria or algae.
5. Step 5: Identify the key characteristic feature. Foraminifera are well-known for possessing shells (tests) made primarily of calcium carbonate, which is a defining trait.