Presentation on theme: "Reproduction in Plants Asexual and Sexual Reproduction"— Presentation transcript:
1 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
2 What is reproduction?Reproduction is when organisms produce new living things. Plants and animals reproduce to make new individuals of the same species.
3 Asexual Reproduction Sexual Reproduction one identical sex cells males .two identical sex cells half embryo diploid one features females pollen males haploid zygote egg fertilisation variation diploidAsexual ReproductionThe 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 ReproductionMost 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 ______.oneidenticalsex cellsmalesfemaleshalfeggpollentwofertilisationfeaturesvariationhaploidzygotediploidembryo
4 Asexual Spore formation in Tuber formation in Binary fission in 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 tubermyceliumSpore has a nucleus , cytoplasm and a spore case, nucleus dividesSporangium
5 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.DisadvantagesIntraspecific competition locally forGenetically identical e.g. if a disease spread no resistance and will dievery little chance of evolution e.g. if environment change will not be able to adapt so
6 (a) stems, (b) roots, (c) buds, (d) leaves, (e) flowers? 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?ABCACB