Question

Which of the following statement(s) is/are correct?

• A. Diatoms are algal forms.
• B. Dinoflagellates are unicellular algae.
• C. Petropods are planktic gastropods.
• D. Radiolarians are organic-walled microfossils.

Hint:

Diatoms and dinoflagellates are important types of planktonic algae. Petropods are small, planktic gastropods, and radiolarians have silica-based walls, not organic walls.

Answer 1

The Correct Option is A, B, C

Let’s analyze the given statements:
- (A) Diatoms are algal forms: This is correct. Diatoms are indeed a type of algae, classified as microalgae. They are important in marine and freshwater ecosystems and are known for their intricate silica-based cell walls.
- (B) Dinoflagellates are unicellular algae: This is also correct. Dinoflagellates are a group of unicellular algae found in both marine and freshwater environments. They are known for their two flagella and their ability to form harmful algal blooms.
- (C) Petropods are planktic gastropods: This is correct. Petropods, also known as "sea butterflies," are a group of gastropods that live in the planktonic zone of the ocean. They are free-floating and have a shell that is adapted for life in the water column.
- (D) Radiolarians are organic-walled microfossils: This statement is incorrect. Radiolarians are indeed microfossils, but their walls are not made of organic material. Instead, they have intricate silica-based skeletons. Therefore, this statement is false.
Thus, the correct answers are (A), (B), and (C).