Pernicious anemia is caused by the deficiency of: MCQ with Answer and Explanation

Explanation:
Alexander Fleming noticed in 1928 that a mold contaminant (Penicillium notatum) on a bacterial culture plate inhibited the growth of Staphylococcus aureus, leading to the discovery of penicillin, the first widely used antibiotic. Florey and Chain later purified it. Pasteur developed pasteurization.

Explanation:
The term 'biology' was independently coined by Jean-Baptiste Lamarck (France) and Gottfried Reinhold Treviranus (Germany) around 1802. Aristotle is father of biology, Linnaeus taxonomy, Darwin evolution.

Explanation:
Collenchyma is a simple permanent tissue characterized by cells with thickened corners due to the deposition of cellulose and pectin. It provides mechanical support, tensile strength, and flexibility to the growing parts of the plant (like stems and petioles), allowing them to bend without breaking. Parenchyma is for storage, and sclerenchyma provides rigid support.