The vitamin deficiency that leads to megaloblastic anemia is: MCQ with Answer and Explanation

Explanation:
Peroxisomes contain catalase and other oxidases that detoxify hydrogen peroxide and other harmful substances. They also play a role in lipid metabolism. Lysosomes contain hydrolytic enzymes, Golgi modifies proteins, nucleus houses DNA. Peroxisomes are abundant in liver and kidney cells.

Explanation:
Meristem culture, a type of tissue culture, involves excising the virus-free apical meristem (shoot tip) and growing it on a nutrient medium to produce a whole plant free of viruses. This is because meristematic cells lack vascular connections through which viruses spread. Cloning produces identical copies, hybridization crosses varieties, mutagenesis uses mutagens.

Explanation:
The iris is the colored part of the eye containing smooth muscles (sphincter and dilator pupillae) that adjust the pupil diameter to control light entry. The cornea and lens focus, retina senses light.