Agricultural uses of plant hormones include

Correct Answer: D

Rationale: Plant hormones like ethylene, gibberellins, and auxins are used to control fruit processes, produce seedless fruits, and act as herbicides. All options are correct.

Correct Answer: D

Rationale: Cytotoxic T cells destroy infected cells via perforin and granzymes, unlike macrophages (phagocytosis), plasma cells (antibodies), or B cells (humoral).

Correct Answer: B

Rationale: Eosinophils target antibody-coated parasites (e.g., helminths) via degranulation, unlike macrophages, neutrophils, or basophils.

Correct Answer: D

Rationale: The BCR includes Igα and Igβ signaling proteins with the antibody (e.g., IgG), making all components correct.

Correct Answer: C

Rationale: Pre-TCRs appear in double-negative thymocytes, before CD4/CD8 expression.