Identify the correct statement regarding the human respiratory system: MCQ with Answer and Explanation

Explanation:
Bacteria are prokaryotes that primarily reproduce asexually through binary fission, where a single cell divides into two identical daughter cells. Fungi are eukaryotes characterized by having cell walls primarily composed of chitin, a tough polysaccharide. Viruses lack cellular structure and metabolic machinery; they are obligate parasites that rely entirely on the host cell's machinery for replication. Thus, statements 1 and 3 are correct.

Explanation:
Dendrites are branched extensions of the neuron cell body that receive synaptic inputs from other neurons and transmit graded potentials towards the soma. The axon conducts action potentials away from the soma to the terminals, which then synapse with other cells. Dendrites have receptor sites for neurotransmitters.

Explanation:
Parenchyma cells are living, thin-walled, and isodiametric, making up the ground tissue of plants. They are involved in photosynthesis (chlorenchyma), storage, and secretion. Collenchyma provides support with uneven thickening, sclerenchyma has lignified walls and is often dead, xylem conducts water.