The silkworm, Bombyx mori, feeds exclusively on the leaves of which plant during its larval stage? MCQ with Answer and Explanation

Explanation:
DNA ligase catalyzes the formation of phosphodiester bonds between adjacent nucleotides, sealing breaks in the DNA backbone. It is essential for joining Okazaki fragments on the lagging strand during replication and in DNA repair. Polymerase adds nucleotides, helicase unwinds, primase synthesizes RNA primer.

Explanation:
Thyroxine (T₄) and triiodothyronine (T₃) are synthesized by thyroid follicular cells. They regulate basal metabolic rate, growth, and development. Iodine is essential for their synthesis.

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.