Biological Classification And System Of Classification Question 84
Question: Auxospores and hormocysts are formed respectively, by
[CBSE PMT 2005]
Options:
A) Some diatoms and several cyanobacteria
B) Some cyanobacteria and many diatoms
C) Several cyanobacteria and several diatoms
D) Several diatoms and a few cyanobacteria
Show Answer
Answer:
Correct Answer: D
Solution:
Auxospores and hormocysts are formed by several diatoms and a few cyanobacteria respectively. Bacillariophyceae members (diatoms) are microscopic, eukaryotic, unicellular or colonial coccoid algae.
These algae are sexually reproduced by the formation of auxospores in most cases. Bozi (1914) and Fermi (1930) reported that short sections of living cells at the tips of the trichomes of Wertiella Janosa become invested by a thick, lamellated, pigmented sheath.
Such multicellular spore-like structures function as perennating bodies. They are specially modified hormones and are called homosporous or hormocysts.
Hence Auxospores and hormocysts are formed respectively by Several diatoms and a few Cyanobacteria.
So, the correct answer is ‘Several diatoms and a few Cyanobacteria’.
BETA
