Consider the following statements about AIDS: 1. It is caused by a bacterium. 2. It weakens the immune system. 3. It can be transmitted by sharing needles. Which of the above is/are correct? MCQ with Answer and Explanation

Explanation:
Chlorophyll and other photosynthetic pigments are embedded in the thylakoid membranes of chloroplasts, where they participate in light-dependent reactions. The stroma contains enzymes for the Calvin cycle. The cell wall and cytoplasm are not sites of photosynthesis.

Explanation:
Apiculture involves the maintenance of honeybee colonies for honey, beeswax, and pollination services. Sericulture is silkworm rearing, pisciculture is fish farming, poultry is bird rearing for eggs/meat. The most common species in India is Apis indica (Indian bee) and Apis mellifera (European bee). Apiculture requires knowledge of bee biology, management of hives, and disease control.

Explanation:
Mitochondria and chloroplasts contain their own DNA and ribosomes (70S) and can replicate by binary fission, a feature supporting their endosymbiotic origin. Golgi apparatus, lysosomes, and rough ER cannot self-replicate; they are part of the endomembrane system and arise from pre-existing membranes. Mitochondria are thus semi-autonomous organelles.