Skip to main content

 MODES OF REPRODUCTION USED BY SINGLE ORGANISMS

                                                           Part 1

The modes by which various organisms reproduce depend on the body design of the organisms. Unicellular organisms reproduce by means of following processes:-


  1. Fission:- Fission is the process of spliting of unicelluar organisms or single celled organisms into the two are more than two cells, each cell forms the new individual. The new individual formed is exact copy of parent cell. Fission is of two types:- 
          A) Binary Fission:-  when the single parent cell divides into two new daughter cells, each new                                                   cell forms new individual, it is called as Binary Fission. Eg Amoeba

                                 

BINARY FISSION IN AMOEBA

B) Multiple Fission:- When the single celled organisms splits into more than two or number of new daughter cells to form the new identical individuals , it is called as Multiple fission. Eg Plasmodium



Click Here for 2nd part
click

 



Labels:

Comments

Post a Comment

Popular posts from this blog

Structure and function of Neuron

Neurons (nerve cells) are the functional units of the nervous system.  A typical neuron is divided into three parts i.e Cell body or Soma,Some contains all the cell organelles like Nucleus, Mitochondria etc. Dendrites and Axon. Schwann cells of Axon are covered by Myelin Sheath. Dendrites are branched like structures on Soma. Axon terminal is also branched like structure. The signals are received from neuron by dendrites and are send to next neuron bye chemo-electrical impulses through axon. The junction between the two cells is known as Synapses.In neuron signal travels in the form of chemicals but at synapses in changes in to electrical impulses.
Post a Comment
Read more

Absorption of Nutrients in Small Intestines

The digested food is now in simple form and is ready to use by cells. The inner wall of small intestines is called as Mucosa, it has numerous finger like projections called as Villi (singular- villus), which in-turn has finger like projections called as micro-villi. The purpose of villus is to provide large surface area for nutrient absorption. Villi have large network of blood capillaries, where the nutrients are absorbed in blood by diffusion.Most of the nutrients are absorbed in jejunum. except Iron is absorbed in duodenum  vitamin B12 and bile salts are absorbed in the terminal ileum. Through blood digested food reaches to each and every cell of the body.
Post a Comment
Read more