Consider statements about human diseases: 1. Dengue is caused by a protozoan. 2. Filariasis is caused by a nematode worm. 3. Pneumonia affects the respiratory system. Which are correct? MCQ with Answer and Explanation

Explanation:
Transformation involves the uptake and incorporation of naked DNA fragments from the surrounding medium by competent bacteria. Conjugation requires cell-to-cell contact via a pilus, transduction is gene transfer by bacteriophages, binary fission is asexual reproduction. Griffith's experiment demonstrated transformation.

Explanation:
The epiglottis is a cartilage flap that covers the glottis (laryngeal opening) during swallowing, directing food into the esophagus and protecting the airway. The tongue manipulates food, the uvula prevents nasal regurgitation.

Explanation:
Poultry farming involves rearing birds like chickens for the production of eggs (layers) and meat (broilers). Apiculture (beekeeping) not only produces honey but also significantly increases crop yields through enhanced pollination by bees. Dairy farming focuses on the breeding and rearing of cattle, buffaloes, etc., for milk production, not fish (which is pisciculture). Thus, statements 1 and 2 are correct.