Plants Without Seeds: From Water To Land By: Michael Sanabria, Andrew Ashworth How did seedless plants occur? • This occurred after many generations of mutations that produced things such as the cuticle, which helps hold in water so the plant doesn’t dry out, and ways to reproduce without having to rely on water. How did organisms move from water to land? ● ● Plants slowly evolved over time to live on land. The first land plants lived near the edges of the water, because they lacked systems of keeping water within the plants. It is thought that hornworts are some of the closest living relatives of the first land plants. Non-Vascular Plants ● Non vascular plants are plants that lack a vascular system. None of that stuff. Vascular Plants • Plants that have a vascular system. Rhizoids are small “roots” that grow from a sideways growing stem that is underground. It is thought that this was what normal roots evolved from, along with branches that grew into the ground. ● Seedless Vascular plants have been evolving for over 500,000,000 million years. What are some characteristics of seedless plants? • All seedless plants reproduce through spores during the sporophyte phase of the alternation of generations. ● They have to live in moist places, like near ponds, because the gametophyte phase relies on water for the sperm to travel to the egg. What is the life cycle of a seedless plant? Question 1 What is the cuticle? I. Protects a young plant II. A waxy covering that retards water loss III. The skin around the plants nail IV. Makes the plant look cute Question 2 Which species are thought to be similar to the earliest land plants? I. Cheetah II. Mouse III. Hornworts IV. Ferns Question 3 About how long have vascular plants been evolving? I. 500,000,000 II. 5,000,000 III. 65,500,000 IV. 4,700,000,000 Question 4 Roots are believed to evolve from what? I. Branches II. Leaves III. Stylus IV. Tabulae Question 5 The earliest vascular plants lacked roots and leaves: I. True II. False III. Impossible! References • http://www.ehow.com/list_5778872_characteristics-seedless-vascularplants.html