Question

Carpogonium occurs in
A. Batrachospermum
B. Spirogyra
C. Albugo
D. Oedogonium

Answer 1

Hint: The female sex organ present in the red algae or rhodophyta is known as carpogonium. They produce structures known as carpophores. They receive sperms and the process of fertilization takes place in this structure.

Complete answer: Batrachospermum is a freshwater red algae. The sexual organization in these species takes place in the carpogonium, which is the female reproductive part. These structures are unicellular and are elongated and a lower globular portion known as the microphore. The ovum is present in the microphore end. The upper portion of the trichogyne is used in receiving the sperms.
Considering the other given options:
-Spirogyra is an aquatic green algae or chlorophyta. These species reproduce both asexually and sexually. The sexual reproduction in these organisms is through conjugation, where the fragments of two individual organisms, lying together, crossover and form the offspring.
-Albugo is a species belonging to the kingdom Fungi, coming under the family ascomycetes. The sexual reproduction in these species is through the production of spores, known as oospores.
-Oedogonium is a green alga that is filamentous and free living. They undergo both sexual and asexual reproduction. These species are oogamous in nature. and the zygote formed gets converted to zygospores.
Thus, the most appropriate answer is A, i.e., Batrachospermum is an aquatic red alga, which possess carpogonium as its female sex organ.

Note: In Batrachospermum, the male sex organs are known as spermatangia or anthredia. Like the female organs, these are also unicellular in nature. They are round in shape, colorless, and possess thick walls. The male gametes known as spermatium is produced when the antheridial wall ruptures.