Which one of the following structures is well-developed in hydrophytes?

Which one of the following best describes development?

Which one of the following is a well-developed tissue present in hydrophytes?

Which one of the following is a well-developed tissue present in hydrophytes?

Which of the following system is well developed in flat worms.

Which one of the following are analogous structures

Which one of the following structure is non-extensible in nature and further prevents development of cell