Question

An example of endomycorrhiza is
a. Rhizobium
b. Nostoc
c. Glomus
d. Agaricus

Answer 1

Hint: Mycorrhiza is the relation between the root of the plant and the fungus with mutual benefits, and they are divided into ecto and endo mycorrhizae types.

Complete answer:
Not all the plants in the earth have relation with mycorrhiza, the plants which have abundant nutrient supply don't need any symbiotic relation.

But in some places mycorrhiza fungi live for mutual benefit, where mainly it grows in roots either outside or inside of the roots.

In this symbiotic relation fungi helps the plant roots to uptake the water and nutrients, and the plant in return supply food to the fungi which prepared in the process of photosynthesis

Again this mycorrhiza is mainly classified into,
Ectomycorrhizae and Endomycorrhizae.

When come to ectomycorrhizae, it means here fungal hyphae mainly lives on the surface of the roots,

Only few terrestrial plants have this type of symbiotic relation, in this type the hyphae of fungi form the sheath around the roots, which can be called a mantle. Mainly they maintain relationships with woody plants such as pine, oak, beech etc.

Endomycorrhizae have a more deep relation with plant roots, where most plants such as crops, greenhouse plants like fruits, vegetables all have mostly Endomycorrhizae .

They are again classified into:
- Arbuscular mycorrhiza- found in zygomycota family and Glomeromycota
- Orchid mycorrhiza- found in orchids
- Ericaceous mycorrhizae- found in the plants of ericke order
- Arbutoid and ectotrophic mycorrhiza

So from the above explanation glomus belong to Glomeromycota which is arbuscular mycorrhiza

So the correct option is glomus.

Note: When we look at other options rhizobium is symbiotic bacteria found in legume plants.
Nostoc is blue green algae and agaricus is an edible mushroom.
So choosing the correct option can be done in an eliminating manner.