Question

Auxospores or rejuvenescent cells are characteristics of ________.

• A. Diatoms
• B. Dinoflagellates
• C. Zooflagellates
• D. Sporozoans

Answer 1

The correct option is A

Diatoms

The correct option is A.

Explanation of the correct option: -

1. To maintain their cell size, diatoms make auxospores. By dividing into two sizable vegetative cells, auxospores increased the cell size. They are crucial for diatom sexual reproduction as well. After haploid gametes combine to produce a diploid zygote, auxospores may develop.
2. Diatoms can also create auxospores, often known as resting spores, which serve as inactive stages. Diatoms can endure harsh conditions like winter or nutrient deprivation thanks to auxospores. Because they develop during cell division, auxospores are also known as rejuvenescent cells.
3. The life cycle of sporozoans is intricate. The infectious spores known as sporozoans are capable of sexual and asexual reproduction. They were once assigned to the Sporozoa class and go by the name apicomplexans.

Explanation of the incorrect options: -

Option B: -

Using a light microscope, dinoflagellates can be distinguished from other unicellular protists by their golden-brown plastids, assimilative cells with indentation waists, unusual swimming patterns, and comparatively big nuclei with visible chromosomes.

Option C: -

1. Zooflagellates are flagellates without plastids or cell walls that feed through phagocytosis or endocytosis. They are not photosynthetic.
2. They are the most varied eukaryotes and, if not all, of them, were directly or indirectly descended from them.

Option D: -

A protozoan phylum of the Kingdom Protista of the old five-kingdom classification system, which contains creatures that share traits such as being one-celled, immobile, parasitic, and spore-forming

Final Answer: - Auxospores or rejuvenescent cells are characteristics of Diatoms.