Presentation on theme: "Reproduction in Plants Asexual and Sexual Reproduction Objectives: *Define sexual and asexual reproduction **Describe binary fission in bacteria, spore."— Presentation transcript:
Reproduction in Plants Asexual and Sexual Reproduction Objectives: *Define sexual and asexual reproduction **Describe binary fission in bacteria, spore formation in fungi and tuber formation in potato ***Discuss the advantages and disadvantages of sexual and asexual reproduction
What is reproduction? Reproduction is when organisms produce new living things. Plants and animals reproduce to make new individuals of the same species.
. Asexual Reproduction The simplest animals reproduce asexually. Only ________ parent is needed. Their body grows and eventually divides to form two new organisms from the original one. Amoeba, a single celled animal reproduces in this way. All offspring are ________ to the parent. Sexual Reproduction Most animals reproduce by making ______ ______ called eggs (made by _______) and pollen (made by _______). Each contain _______ the information needed to make a new individual. Therefore, the _____ and ________ must join together to make a new organism, this is known as _______________. There are _____ parents involved in sexual reproduction and the offspring shows _________ from both parents. This means it brings about ___________. The nuclei with half information are called ________. The fertilised product is a ______ and has a ___ nucleus. Zygote divides to form an ______. egg one fertilisation sex cells halffemales males two pollen features identical two identical sex cells half embryo diploid one features females pollen males haploid zygote egg fertilisation variation diploid variation haploid zygote diploid embryo
Asexual Binary fission in Spore formation in Tuber formation in mycelium Sporangium Spore has a nucleus, cytoplasm and a spore case, nucleus divides Underground stems receive sucrose via phloem from leaves and store them as starch. In the process they swell up and are called stem tubers. The parent plant dies leaving the tuber to survive the winter. When they grow new shoots and roots emerge from growing points called eye of the tuber
Asexual in __________Sexual in __________ Advantages1.Fast so can colonise areas where parent plants grow e.g. 2. Very little variation due to environmental change e.g. 1. Disadvantages1.Intraspecific competition locally for 2.Genetically identical e.g. if a disease spread no resistance and will die 3.very little chance of evolution e.g. if environment change will not be able to adapt so
ABC 1 In natural vegetative propagation, which of the following structures are most likely to give rise to new individuals: (a) stems, (b) roots, (c) buds, (d) leaves, (e) flowers? C B A