Step 1: Understanding mutation induction.
Mutations are changes in DNA sequence that can occur naturally or be induced artificially using physical or chemical agents known as mutagens.
Step 2: Types of mutagens.
Physical mutagens include radiation such as UV rays, X-rays, and gamma rays. These high-energy radiations damage DNA structure and cause mutations.
Step 3: Role of gamma radiations.
Gamma radiations are highly penetrating ionizing radiations that can break DNA strands or alter nucleotide sequences, making them effective mutagenic agents.
Step 4: Evaluation of other options.
Ethylene and IAA are plant hormones, not mutagens. Infrared radiation does not have sufficient energy to cause DNA-level mutations effectively.
Step 5: Biological significance.
Induced mutations are widely used in plant breeding and genetic research to create improved varieties.
Step 6: Final conclusion.
Thus, mutations can be induced using gamma radiations.