EVERYDAY SCIENCE

Detailed explanation-1: -(ii) Sexual Reproduction: Sporophytic Phase: Spore producing organs: Marsilea is heterosporous i. e., it produce two types of spores-microspores and megaspores. These spores are produced in microsporangia and megasporangia, respectively.

Detailed explanation-2: -Marsilea drummondii is an aquatic perennial rhizomatous fern. It is highly polymorphic in many features. The sterile fronds are erect when growing in mud, floating when growing in water (Jones, 1998), each consisting of two pairs of leaflets arranged in a fourleaf-clover pattern.

Detailed explanation-3: -Marsilea quadrifolia L. commonly named as European water clover, four-leaf clover, water shamrock and pepperwort, is a leptosporangiate aquatic pteridophyte belonging to the Marsileaceae family.

Detailed explanation-4: -A small order of heterosporous, leptosporangiate ferns (division Polypodiophyta) which grow in water or wet places and are rooted to the substrate. The leaves arise on long stalks from the rhizome and typically have floating blades with four leaflets, suggesting a four-leaved clover.