In humans, the number of autosomal chromosomes in a sperm is: MCQ with Answer and Explanation

Explanation:
During metaphase, chromosomes are maximally condensed and align at the cell equator (metaphase plate) attached to spindle fibers via kinetochores. This alignment ensures equal segregation. In prophase, chromosomes condense; anaphase, sister chromatids separate; telophase, nuclear envelope reforms. Metaphase is the best stage for studying chromosome morphology for karyotyping.

Explanation:
Cuscuta (dodder) is a parasitic plant that lacks chlorophyll and derives nutrients from the host plant through haustoria. It is a total stem parasite. Mango, neem, and sunflower are autotrophic plants performing photosynthesis. Heterotrophic plants include parasites (Cuscuta, Rafflesia) and saprophytes (Monotropa).

Explanation:
Cardiac muscle cells are striated, branched, and connected by intercalated discs containing gap junctions for synchronized contraction. They are involuntary. Multinucleated syncytium is typical of skeletal muscle. Spindle-shaped non-striated cells characterize smooth muscle. Voluntary control is for skeletal muscle. Intercalated discs allow rapid ion passage, enabling the heart to function as a syncytium.