The element that is essential for the synthesis of auxin in plants is: MCQ with Answer and Explanation

Explanation:
Lymph is interstitial fluid that has entered lymphatic capillaries. When lymph vessels are blocked (e.g., filariasis), lymph accumulates, causing swelling (lymphedema). Plasma is blood fluid, synovial in joints, serum is plasma without clotting factors.

Explanation:
Bacillus thuringiensis (Bt) is widely used as a biopesticide, specifically a bioinsecticide. The spores of Bt contain crystalline proteins (Cry toxins) that are toxic to the larvae of many insects, particularly Lepidoptera (caterpillars), Diptera (flies), and Coleoptera (beetles). When sprayed on crops or ingested by transgenic plants, these toxins kill the pests without harming humans, animals, or beneficial insects.

Explanation:
In 1885, Louis Pasteur developed the first effective vaccine against rabies. He achieved this by serially passaging the rabies virus (obtained from the saliva of infected dogs) through the spinal cords of rabbits. This process attenuated (weakened) the virus for rabbits but made it virulent for dogs. He then dried the infected spinal cords to further weaken the virus and used this attenuated material to successfully inoculate and protect a boy, Joseph Meister, who had been bitten by a rabid dog.