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Fundamental Unit of Life CELL class 8th and 9th

                   Chapter 8 CELL — STRUCTURE AND FUNCTIONS for class 8 The basic structural and functional unit of an organism The basic structural and functional unit of an organism is called cell. Cells are like bricks that are assembled to make a building. Similarly, cells are assembled to make the body of every organism. This is why cell are called the basic structural and functional unit of an organism. Found on kidcourses.com Discovery of cell: Robert Hooke in 1665 observed slices of cork (a part of the bark of a tree) under a simple magnifying device. He Robert Hooke observed under a microscope there are many partitioned boxes or compartments like a honeycomb. Hooke coined the term ‘cell’ for each box. A hen’s egg can be seen easily. Is it a cell or a group of cells? It is a single cell. A white blood cell (WBC) in human blood is another example of a single cell. How do scientists observe and study the living cells? Scientists used microscopes w

CBSE Class 8 - Science - Ch-09-Reproduction in Animals(Notes and Question Answer)

Q.Draw label diagram of male and female r eproductive organs in humans. Answer:  Q. What are different kinds of fertilization? Answer: Fertilization which takes place inside the female body is called internal fertilization. Internal fertilization occurs in many animals including humans, cows, dogs and hens. The fusion of a male and a female gamete takes place outside the body of the female is called external fertilization. It is very common in aquatic animals such as fish, starfish, etc. Q. Differentiate between Viviparous and Oviparous Animals? Answer: The animals which give birth to young ones are called viviparous animals. eg. cat ,dog, lion etc. Those animals which lay eggs are called oviparous animals.e.g. insect , fish ,frog, and reptile. Q. What is metamorphosis? Answer: Metamorphosis is the process of the transformation of larva into an adult through drastic change. For example pupa into adult butterfly. Metamorphosis does not occur in viviparous anima