In which of the following group of organism fruiting bodies act on site of reduction division, leading & formation of endogenous haploid spores ?PhycomycetesAscomycetesBasidiomycetesDeuteromycetes

The group of organisms in which fruiting bodies act on the site of reduction division, leading to the formation of endogenous haploid spores, is Ascomycetes.

Here's a step-by-step explanation:

1. Ascomycetes, also known as sac fungi, are a division of fungi that produce spores inside a sac-like structure called an ascus. This is a unique feature of this group of fungi.

2. The fruiting bodies of Ascomycetes, known as ascocarps, are the sites where the reduction division or meiosis occurs.

3. During this process, one diploid cell undergoes meiosis to produce four haploid cells. These haploid cells are the spores, which are formed inside the ascus.

4. These spores are endogenous, meaning they are produced within the organism itself.

5. Therefore, in Ascomycetes, the fruiting bodies act on the site of reduction division, leading to the formation of endogenous haploid spores.

The other groups of fungi - Phycomycetes, Basidiomycetes, and Deuteromycetes - have different methods of spore formation and do not fit the description given in the question.