The ratio between the concentration of a substance in animal tissue and its daily dietary intake of a terrestrial animal is expressed as:

Correct option is B

The Biotransfer Factor (BTF) quantifies how much of a substance consumed through food accumulates in animal tissues. It is calculated as:

This is especially used in ecotoxicology and risk assessments for terrestrial animals (livestock, wildlife, etc.) exposed to contaminants through feed.
Information Booster:
· Biotransfer factor is used in:
· Estimating human exposure through animal products (e.g., milk, meat).
· Modeling toxicant accumulation in food chains.
· A higher BTF indicates a greater potential for biomagnification.
Additional Information:
· (a) Bioconcentration factor (BCF):
· Refers to uptake from water (not diet) into aquatic organisms.
· (c) Partition coefficient:
· Ratio of concentration between two phases (e.g., octanol/water), indicating lipophilicity.
· (d) Toxicant concentration:
· Simple measurement; not a ratio or standardized factor.