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write about cell,cell theory and the discovery of different organelles with the name of the scientists.

Posted by Siddharth Kandhway 4 years, 4 months ago

CBSE > Class 09 > Science

1 answers

Meghna Thapar 4 years, 4 months ago

In 1665, Robert Hooke first discovered and named the cells.
Depending on the presence or absence of membrane bound cell organelles and nucleus, cells may be prokaryotic or eukaryotic.
The three major functional regions of the cell are: plasma membrane, nucleus and cytoplasm.
Plasma membrane is a thin, selectively permeable membrane, covering the cell and is made up of lipids and proteins.
Plasma membrane separates the contents of a cell from its outside environment and regulates the flow of substances to and from the cell through diffusion, facilitated diffusion, active transport and endocytosis.
Cells of Plants, fungi and bacteria contain both plasma membrane & cell wall.
The nucleus of a dividing cell shows rod-shaped chromosomes, made up of DNA and proteins. In a non-dividing cell, the chromosomes elongate and take the form of thread-like structures called chromatin fibres.
Cytoplasm is the fluid content of the cell, occurring between nucleus and plasma membrane. It stores several vital chemicals and is the site of certain important metabolic pathways. Several specialized cell organelles are present in the cytoplasm.
The various cell organelles include endoplasmic reticulum, Golgi apparatus, lysosomes, mitochondria, plastids, vacuoles and centrosome.
Mitochondria are the ‘powerhouses of the cell’, as they provide energy for various metabolic activities.
Plastids occur in most plant cells. They are of three types: Chromoplasts, chloroplasts and leucoplasts.
Chromoplasts are coloured plastids (except green colour), chloroplasts are green coloured containing chlorophyll and carry out photosynthesis in plants. Leucoplasts are colourless plastids that store starch, oil and protein granules.
The large central vacuole of mature plant cells provides turgidity to the cell and also stores important substances.
Centrosome is found only in animal cells and consists of two centrioles. It helps in cell division.

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Posted by Samir Chakma 1 month, 1 week ago

CBSE > Class 09 > Science

0 answers

Don't post personal information, mobile numbers and other details.
Don't use this platform for chatting, social networking and making friends. This platform is meant only for asking subject specific and study related questions.
Be nice and polite and avoid rude and abusive language. Avoid inappropriate language and attention, vulgar terms and anything sexually suggestive. Avoid harassment and bullying.
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Remember the goal of this website is to share knowledge and learn from each other. Ask questions and help others by answering questions.

Posted by Abhi Sandhu 2 months, 1 week ago

CBSE > Class 09 > Science