Alternation of Generations Take 5 32212 n n

Alternation of Generations

Take 5: 3/22/12 n n n You can find seeds of conifer plants in the ______. What cells are responsible for opening and closing stomata? What are the two main functions of parenchyma cells?

Alternation of Generations There are 2 alternating stages _______ gametophyte & sporophyte _______

Alternation of Generations Dip 1) _____loid sporophyte produces makes meiosis spores via ______ ha 2) These ____ploid spores grow into multicellular, haploid gameto _____phytes

Alternation of Generations 3) The gametophytes produce haploid ______ gametes (egg & sperm) 4) The sperm fertilizes egg and the product formed is a diploid ______ (This process is known zygote as SEXUAL REPRODUCTION)

Alternation of Generations 5) Zygote grows into an embryo ____phyte sporo 6) The fully grown mature sporophyte then produces _____ which grow into spores _______ gametophytes …

Asexual reproduction n Most plants can also reproduce asexually (This process is called vegetative _______) reproduction n These new plants are produced from the existing plant organs and have same genetic makeup as the parent plant

Life Cycle of Mosses n n The ______phyte gameto stage is dominant. Haploid spore grows into a _______ protonema which then grows into a gametophyte.

Life Cycle of Mosses n n Some mosses: male and females form on separate gametophytes, others species on same gametophyte. Has _______ archaegonia (egg-producing) & ________ (sperm-producing) antheridia

Life Cycle of Mosses n n Fertilization requires water _____ for sperm to swim Some reproduce asexually by vegetative _______ reproduction

Life cycle of Ferns n n The ____phyte sporo is dominant. Ferns fronds grow rhizomes from ______ (underground stem)

Life cycle of Ferns n Clusters of sporangia are sori called ____ and are found on the underside of fern.

Life cycle of Ferns n n Sporophyte ______ occurs in sori to make haploid spores When conditions are right, the sporangia open & release the spores.

Life cycle of Ferns n The spore germinates into a heart-shaped gametophyte called a prothallus ______

Life cycle of Ferns n n n Antheridia and archegonia are made on the surface of the prothallus. Sperm swim to eggs. Fertilizes it. Diploid _____ zygote forms and develops into sporophyte

Life cycle of Conifers n n The _____phyte sporo is dominant. Adult sporophyte produces male & female coneson ______ separate branches of one plant

Life cycle of Conifers n n Female cones are larger. Cones have sporangia on scales. Pollination = _______ transfer of pollen grains from male cone to female cone (wind borne)

Life cycle of Angiosperms n Like conifers, gametophyte generation is contained within sporophyte generation Panama’s national flower