The vitamin that is a coenzyme in the decarboxylation of pyruvate to acetyl-CoA is: MCQ with Answer and Explanation

Explanation:
A food chain shows the flow of energy from producer to consumers. Grass (producer) → Grasshopper (primary consumer/herbivore) → Frog (secondary consumer/carnivore) → Snake (tertiary consumer). Arrows point in the direction of energy flow. Option A has incorrect order, C and D start with consumer. Typically, energy decreases at each trophic level. This illustrates the correct trophic sequence.

Explanation:
Minamata disease is a neurological syndrome caused by severe mercury poisoning, first discovered in Minamata, Japan, due to industrial wastewater containing methylmercury that bioaccumulated in fish. Lead causes plumbism, cadmium causes Itai-itai disease, arsenic causes arsenicosis. Mercury affects the central nervous system, causing numbness, muscle weakness, and vision problems.

Explanation:
The plasma membrane (cell membrane) is selectively permeable, regulating the entry and exit of substances into and out of the cell, maintaining internal homeostasis. The nucleus is the membrane-bound organelle that houses the cell's genetic material (DNA) organized into chromosomes, directing cellular activities. Mitochondria are the double-membrane-bound organelles known as the 'powerhouses of the cell' because they are the primary site of aerobic respiration, producing the majority of the cell's ATP (energy currency). All statements are correct.