Which of the following statements about plant tissues is correct? MCQ with Answer and Explanation

Explanation:
Polymerase chain reaction (PCR) amplifies a specific DNA segment exponentially using primers, DNA polymerase (Taq), and thermal cycling. Gel electrophoresis separates DNA by size, sequencing determines base order, microarray analyzes gene expression. PCR is crucial in cloning, diagnostics, and forensics.

Explanation:
The fossil record shows a chronological sequence of life forms, providing direct evidence of evolutionary changes over time. Embryological similarities, such as the presence of pharyngeal slits and a notochord in early vertebrate embryos, support the idea of common ancestry. Biogeography, the study of species distribution, shows that species are not randomly distributed but are related to their geographic origins and evolutionary history. Thus, statements 1 and 2 are correct.

Explanation:
Pteridophytes (ferns and their relatives) are the first terrestrial plants to possess vascular tissues (xylem and phloem) for water and nutrient transport. However, they do not produce seeds or flowers and reproduce via spores. Hence, they are called 'vascular cryptogams'. Bryophytes are called 'amphibians of the plant kingdom'.