Question

VAM is component of _________
A)Ectomycorhiza
B)Endomycorrhizae
C)Green manure
D)Mycoherbicides

Answer 1

Hint: The vesicular-arbuscular mycorrhiza (VAM) is the symbiotic association in between certain fungi and the roots of green plants. They help in increasing the mineral absorption by the roots and also helps in providing necessary nutrients which are essential for growth and development of plants.

Complete answer:
VAM is a fungus which penetrates into the roots of vascular plants. It helps them in absorbing nutrients from the soil. The VAM forms branched hyphae inside the cells in the root cortex. This is called arbuscles. This type of mycorrhizae is known as endomycorrhizae. These hyphae provide increased surface area for more absorption of minerals from the soil.

The ectomycorrhizal (symbiotic relation between fungi and gymnosperm or angiosperm) is a net like structure which is formed between the cells in the root cortex. It contributes in increasing the biomass of a forest ecosystem.

Green manure- These are the species of the plant which are planted to improve the soil quality. They are also known as cover crops.

Mycoherbicides- These are the herbicides which are based on fungus. They grow and linger in the soil and destroy the planted crops. They produce certain toxins which destroy the cell wall.

Hence, the correct answer is option (B)

Note: VAM can dissolve phosphates found in the soil. They also help the plant in fighting against the disease pathogens. Also helps the plant to resist adverse climatic/environmental conditions. The plant productivity is enhanced due to this symbiotic relation.