Question

Which of the following pairs is not correctly matched?
A. Mode of reproduction- Conidia, Example - Penicillium
B. Mode of reproduction- Offset, Example - Water hyacinth
C. Mode of reproduction-Rhizome, Example - Banana
D. Mode of reproduction-Binary fission, Example - Sargassum

Answer 1

In protozoans like Amoeba, Paramecium and Euglena, the mode of reproduction is by binary fission. They do differ in the process of cell splitting mechanism but binary fission is the only mode of reproduction in these organisms. During binary fission, one paramecium cell divides into two genetically identical offspring, or daughter cells.

Complete step by step answer:
A. The Conidia are the thick-walled, non-motile spores produced in chains over the conidiophores. These are commonly produced by Penicillium.
B. The Offset is a kind of subaerial stem in which crowns are formed at the tips. The crowns break and each horizontal stem develops into the independent plant. They are seen in the Water hyacinth.
C. The rhizome is a part of the underground stem which is used for the vegetative propagation in plants like Banana.
D. Binary fission is the process of division of a parent into daughter cells of equal size and is seen in the Amoeba and not in Sargassum. The plant body sargassum is a diploid sporophyte. It does not multiply asexually by means of pores. Instead, it reproduces by vegetative means, that is, fragmentation, which is the only known method of vegetative reproduction in the free-floating species of Sargassum.
Hence, the correct answer is option D.

Note: Binary fission is similar in some aspects to mitosis. Steps involved in binary fission involves i. Copying of the genetic material.
ii. The cell then results in the formation of a septum which leads to the division of the cytoplasm.
iii. The newly formed genetic material passes into the newly formed cytoplasm.
iv. Thus, a new organism is formed.