HORTICULTURE

Detailed explanation-1: -Ancestors of green plants began to colonise the land about 500 million years ago and it is generally accepted that they evolved from streptophyte algae (a group of green, fresh water algae).

Detailed explanation-2: -Analyses of both morphological and molecular data have established that land plants evolved within Charophyte algae more than 450 million years ago.

Detailed explanation-3: -Mesostigma viride, a unicellular freshwater alga that appeared ∼800 million years ago, is a living descendant of the ancestor of all green algae and land plants, and belongs to the earliest diverging green plant lineage discovered to date.

Detailed explanation-4: -Green algae are considered as the ancestors of angiosperms.