Question

Which one of the following is a biofertilizer?

• A. VAM
• B. Sporeine
• C. Devine
• D. Agent orange

Answer 1

The correct option is A

VAM

The correct option is A.

Explanation of correct option:

1. VAM is a biofertilizer.
2. Biofertilizers are microorganism-containing compounds that, when added to soil, boost fertility and encourage plant development.
3. The symbiotic relationship between certain phycomycetous fungi and roots of angiosperm plants forms VAM (Vesicular-arbuscular mycorrhizal).
4. The fungus takes water and minerals from the soil and supplies them to the plant, while the angiosperms supply the fungi with ready-to-eat food.

Explanation of incorrect options

Option B:

1. Sporeine is the brand name for a commercially available Bt toxin product (Bacillus thuringensis).
2. The Bt toxin is a bioinsecticide.
3. It's utilized to keep numerous coleopterous and lepidopterous larvae under control.
4. The active element in Bt is a toxin-like protein that attaches to certain midgut locations of the insects and pests.

Option C:

1. Devine is the first bioherbicide to be approved for application in the United States, and it is used to suppress milkweed vine.
2. It is actually a liquid mixture of Phytophthora palmivora chlamydospores.
3. The pathogen attacks the milkweed vine's roots, causing it to completely wilt.

Option D:

1. Agent Orange is a herbicide that also acts as a chemical weapon.
2. During the Vietnam War, it was used by the US military to eliminate leaves and foliage for combat operations.

Final Answer: biofertilizer is VAM.