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BIOLOGY :TOPIC 1- REPRODUCTION IN PLANTS

REPRODUCTION IN PLANTS 

Image result for reproduction in plants class 7                     Image result for reproduction in plants class 7



TYPES OF REPRODUCTION IN PLANTS -

1) SEXUAL REPRODUCTION
2) ASEXUAL REPRODUCTION


1) SEXUAL REPRODUCTION

Sexual reproduction involves the fusion of both the gametes (male and female).Male parent produces the male gamete and the female parent produces the female gamete.A male gamete is usually small with a nucleus and little cytoplasm.The female gamete is larger,with a nucleus and more cytoplasm than the male.The fusion of these two gametes is called as fertilisation. The product of fusion of the two gamates is called zygote.After fertilisation, the zygote undergoes cell division and growth.Ultimately it forms the new individual.

Image result for sexual reproduction in plants

In many plants ,the male and the female parts are present in the same flower .Such flowers are called bisexual.Examples-pea,rose,mustard,sunflowers,china rose.


Image result for -pea,rose,mustard,sunflowers,china rose                                    Image result for pea flower



In some plants,the male and the female parts are borne in different flowers. Examples-date palm,papaya,mulberry,corn and cucumber.



Image result for papaya tree flowers                               Image result for mulberry flowers

 2) ASEXUAL REPRODUCTION 

Asexual reproduction not involves the union of gametes. There are several methods of asexual reproduction-

1) Binary Fission 
2) Budding
3) Fragmentation
4) Spore Formation
5) Regeneration
6) Vegetative Propagation

1) Binary Fission : Asexual mode of reproduction in which an organism divides into two daughter organisms of equal size.


Image result for binary fission

2) Budding : Asexual mode of reproduction in which a small outgrowth (bud) appears on the body of the organism.

Image result for budding
3) Fragmentation : In some filamentous organisms such as spirogyra (an alga),the filaments break into two or more fragments.Each fragment or piece grows into a new individual.

Image result for fragmentation reproduction in spirogyra

4) Spore Formation : Spore Formation is a method of asexual reproduction which is found in non flowering plants such as fungi (Rhizopus) and bacteria. In this method of reproduction, the parent plant produces hundreds of tiny spores which can grow into new plants. 

Image result for spore formation in rhizopus
5) Regeneration : The ability of living things to repair themselves or grow lost parts is called regeneration.Plants generally have greater powers of regeneration than animals do.

Image result for regeneration in plants

6) Vegetative Reproduction : Asexual method of reproduction in plants where vegetative parts (root,stem and leaf) are used to grow new plants.

Image result for vegetative reproduction       Image result for vegetative reproduction


Image result for vegetative reproduction                Image result for vegetative reproduction in potatoImage result for vegetative reproduction   

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Comments

  1. Unknown22 March 2019 at 11:02

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    ReplyDelete
  2. Unknown7 May 2019 at 01:18

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