The deficiency of vitamin B₁₂ leads to which type of anemia? MCQ with Answer and Explanation

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.

Explanation:
Crassulacean Acid Metabolism (CAM) plants, such as cacti and succulents, adapt to arid environments by opening their stomata at night to fix CO2 into organic acids (like malic acid) and storing them in vacuoles. During the day, the stomata close to prevent water loss, and the stored CO2 is released for the Calvin cycle.

Explanation:
The joints between skull bones are immovable fibrous joints called sutures, where bones are tightly connected by dense connective tissue. Hinge joint (elbow, knee) allows movement in one plane. Ball and socket (shoulder, hip) allows multi-directional movement. Pivot joint (atlas-axis) allows rotational movement. Sutures fuse completely in old age.