Give two example which reproduce a sexually by binary fission.Īns. Fertilisation of gametes is the most critical event in Sexual Reproduction. Which is the most critical event in Sexual Reproduction.Īns. Amoeba is considered immortal because it does not undergo natural death. Development of embryo from zygote by the process called embryogenesis.Īns. The post-fertilisation events included:Ģ. Name one bisexual and one unisexual animal.Īns. Reproduction is a biological process by which an organisms produces another organisms of its own kind. The period between birth to the natural death of an organisms is known as life span.Īns. There are some small and I marks questions based on this chapterĪns. Hence, the unicellular organisms which undergo binary fission are considered immortal. In fact after binary fission, parent continues living as two daughter- individuals. There is no remains of parents body cell and parent cannot be said to have dead. The parent body divides into two halves and each rapidly growing into an adult. Thus in these organisms cell division is itself a mode of reproduction. Asexual reproduction is common among single-celled organisms. The- unicellular organisms which reproduce by binary fission are causidered immortal Instify.Īns. (ii) Multiple fission-A type of sexual reproduction in which the Parental Organisms Produces many daughter cells simultaneously during unfavourable conditions. (i) Binary fission-A type of asexual reproduction in which the Parental Organisms divides in two daughters cells during favourable conditions. Fission is a type of sexual reproduction in which a fully grown parental organism divides into two or more than two daughters. fission irt Amoeba and Binary fission.Īns. Define fission, what are two types of fusion?ĭescribe multiple. Let’s discuss 5 marks long answer questions from this chapterĪlso Read: CBSE Class 12th Solved Question Papers PCB - eBook At the end of meiosis only one set of chromosome is incorporated into each gametes. In haploid organisms meiocytes undergo meiosis. Thus meiosis is required by such diploid. A haploid parent produced gametes by mitosis.īut in majority of organisms, Parent body is diploid. Gametes in all heterogametic species are of two types i.e., male and female. Gametogenesis refers to the process of formation of two types of gametes male and female. Explain why meiosis and gamete genesis are always Inter linked ?Īns. At this stage body metabolism is shown down and ultimately this stage leads to death. (iii) Senscent Phase-The end of reproductive phase is one of the parameters of senescene or old stage. (ii) Reproductive Phase-The end of Juvenile Phase is indicated by many of them showing morphological and physiological changes prior to active reproductive behaviour, This period of growth is called Juvenil Phase, or Vegetative phase. (i) Juvenile Phase- The period of growth and maturity in life when then organisms reproduce sexually.
(ii) Vegetative propagation by Stem (rhizome) in Ginger, Turmeric etc.Īns. (i) Vegetative propagation by leaves, in Bryophyllum. Such structures are called vegetative propagules.
In plants, The units of vegetative propagation such as runner, rhizome, sucker, tuber, offset, bulb are all capable of giving rise to new offsprings. Vegetative propagation in plants is a, type of asexual reproduction in which new individual appears from any vegetative parts of parents plant.
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