Asexual and Sexual Reproduction Notes Unit 6

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Name ____________________________________________________________ Period _______ 7th Grade Science Asexual and Sexual Reproduction Notes Unit 6 Asexual Reproduction Type of reproduction in which a new organism is produced from ONE parent and the offspring is identical to the parent. Occurs in most plants, bacteria, protists, and low invertebrates. One parent Offspring are identical to the parents. Advantages and Disadvantages of Asexual Reproduction Advantages – Identical to parent, so will get all good characteristics. Disadvantages – Identical to parent, so will also get bad characteristics and is less able to adapt to environment. Types of Asexual Reproduction Regeneration – organism uses cell division to re-grow body parts. Example: starfish, salamander Vegetative Propagation – results in a new plant that is genetically identical to the parent plant (a clone). Examples: strawberry plant, vegetables, and crops. Budding – organism that produces a bud that breaks away to live on its own. Example: hydra Binary Fission – used by bacteria, an organism whose cells do not contain a nucleus copy then divide into two identical organisms Example: bacteria Sexual Reproduction Two parents Offspring are a combination of both parents and are therefore different from each parent. Advantages and Disadvantages of Asexual Reproduction Advantages – variety and/or diversity of offspring (color, shape, size, intelligence, ability, etc.), More able to adapt to environmental changes. Disadvantages – uniqueness, sometimes traits needed for survival are not passed on. Types of Sexual Reproduction Plants – when the reproductive cells of one plant fertilize (pollinate) the reproductive cells of another plant. This produces seeds that can grow into a new plant. Animals – when the reproductive cells of one animal fertilize the reproductive cells of another animal. This produces a baby (embryo). .

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Reproduction in Plants Which But, She Has Never Seen the Seeds We Shall Learn in This Chapter
Reproduction in 12 Plants o produce its kind is a reproduction, new plants are obtained characteristic of all living from seeds. Torganisms. You have already learnt this in Class VI. The production of new individuals from their parents is known as reproduction. But, how do Paheli thought that new plants reproduce? There are different plants always grow from seeds. modes of reproduction in plants which But, she has never seen the seeds we shall learn in this chapter. of sugarcane, potato and rose. She wants to know how these plants 12.1 MODES OF REPRODUCTION reproduce. In Class VI you learnt about different parts of a flowering plant. Try to list the various parts of a plant and write the Asexual reproduction functions of each. Most plants have In asexual reproduction new plants are roots, stems and leaves. These are called obtained without production of seeds. the vegetative parts of a plant. After a certain period of growth, most plants Vegetative propagation bear flowers. You may have seen the It is a type of asexual reproduction in mango trees flowering in spring. It is which new plants are produced from these flowers that give rise to juicy roots, stems, leaves and buds. Since mango fruit we enjoy in summer. We eat reproduction is through the vegetative the fruits and usually discard the seeds. parts of the plant, it is known as Seeds germinate and form new plants. vegetative propagation. So, what is the function of flowers in plants? Flowers perform the function of Activity 12.1 reproduction in plants. Flowers are the Cut a branch of rose or champa with a reproductive parts.
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