Question

Given below are two statements:
Statement (I): The combined effect of competition and allelopathy where growth of weeds or crop or both is reduced is called allelomediation.
Statement (II): Allelopathy depends on addition of chemical compounds while competition involves removal of an essential factor from the environment.
In light of the above statements, choose the most appropriate answer from the options given below.

• A. Both Statement (I) and Statement (II) are true.
• B. Both Statement (I) and Statement (II) are false.
• C. Statement (I) is true but Statement (II) is false.
• D. Statement (I) is false but Statement (II) is true.

Hint:

Recall that allelopathy adds chemicals to the surroundings while competition removes resources from it.

Answer 1

The Correct Option is A

This question tests whether we know the exact definitions used to separate competition, allelopathy, and their combined effect called allelomediation.

1. Statement I: It defines allelomediation as the joint effect of competition and allelopathy causing reduced growth in weeds, crop, or both. This is the standard textbook definition, so this statement is true.
2. Statement II: It separates the two mechanisms by their mode of action, allelopathy adds chemical compounds to the surroundings while competition removes a needed factor like water, light, or nutrients from the surroundings. This distinction is also the standard one used in weed science, so this statement is true as well.

Since both statements match the accepted definitions used for these terms, the correct choice is option 1, both Statement I and Statement II are true.

Let's summarize:

• Allelomediation combines competition and allelopathy into one net effect on growth.
• Allelopathy adds chemicals, competition removes resources, and both statements state this correctly.

So the final answer is that both statements are true.