Warm Up # What is the difference between sexual and asexual reproduction in plants?

Lesson 3: Plant Reproduction

Essential Questions What is the alternation of generations in plants? How do seedless plants reproduce? How do seed plants reproduce?

How can you identify fruits? ACTIVITY Examine the pictures Determine whether each item is a fruit.

How can you identify fruits? ACTIVITY Look at the insides of the foods from the past slides. What do you notice? Do you agree with your previous thoughts?

Asexual Reproduction vs. Sexual Reproduction Asexual reproduction – part of plant develops into a separate new plant, which is genetically identical to the parent plant Sexual reproduction – plant’s sperm combines with a plant’s egg creating a zygote with a genetic combination of its parents BrainPop- Asexual Reproduction

Alternation of Generations – occurs when the life cycle of an organism alternates between diploid and haploid generations

Reproduction in Seedless Plants First land plants were seedless plants like mosses and ferns Grow in moist environments where sperm must swim through the water to reach an egg BrainPop – Seedless Plants

How do seed plants reproduce? Pollen grain – forms from tissue in a male reproductive structure of a seed plant Produce sperm cells Wind, animals, gravity, or water carry pollen to the egg Pollination – occurs when pollen grains land on a female reproductive structure of a plant that’s the same species as the pollen grains Dormancy – time of no growth Can last days, weeks, or years BrainPop- Pollination

How do seed plants reproduce? Ovule – the female reproductive structure of a seed plant where the haploid egg develops After pollination, fertilization occurs by sperm entering ovule creating a zygote Embryo – an immature diploid plant that develops from the zygote Seed contains the embryo, food supply, and a protective covering

Reproduction in Flowerless Seed Plants Gymnosperm = naked seed, not surrounded by a fruit Ex. Conifers like pines, firs, redwoods, shrubs with needlelike leaves

Reproduction in Flowering Seed Plants (Angiosperms) Reproduction begins in the flower Male reproductive parts: Stamen- male reproductive organ with pollen grains on the anther Filament supports the anther Female reproductive parts: Pistil – female reproductive organ where pollen lands on the stigma Ovary – at the base of the style that contains ovules BrainPop – Plant Growth

Life cycle of an Angiosperm BrainPop- Seed Plants