Alexander Fleming discovered the antibiotic penicillin from the fungus: MCQ with Answer and Explanation

Explanation:
Codominance occurs when both alleles in a heterozygote are fully and equally expressed. In the ABO blood group system, the IA and IB alleles are codominant. An individual with the genotype IAIB will have both A and B antigens on the surface of their red blood cells, resulting in the AB blood type. It also involves multiple alleles (IA, IB, i).

Explanation:
Rickets is a childhood bone disorder caused by a severe deficiency of Vitamin D (Calciferol), or sometimes calcium or phosphate. Vitamin D is essential for the absorption of calcium and phosphorus from the gut. Its deficiency leads to soft, weak bones, resulting in skeletal deformities like bowed legs, delayed growth, and bone pain. Osteomalacia is the adult equivalent.

Explanation:
Rabi crops are sown in winter (October-December) and harvested in spring (March-April). Wheat, gram, mustard, pea are common rabi crops. Rice, maize, and sugarcane are kharif crops, sown with the onset of monsoon and harvested in autumn. This distinction is based on seasonal cultivation patterns in Indian agriculture. Rabi crops require cool growing season and warm harvest season.