Tuesday 15 December 2020

fundamental unit of life 9th cbse notes and video links

Golgi apparatus

First described by Golgi

It is a system of membrane bound veicles arranged parallel to each other in stacks called cisterns

Draw small figures which i showed in video

They are often connected to endoplqmisc reticulated

They pack,store,modify,dispatch various material formed in cell

To inside and outside of cell

Functions are
Storing materials
Packaging
Modifying
Dispatching
Sometimes making lysosomes
Some times convers simple sugars to complex sugars
Like glucose to starch
Video link
https://youtu.be/tF85FTqWSPg


Lysosomes

Lysosome are membrane bound cell organlees filled with powerful digestive enzymes

These enzymes are made in rough endoplasmic reticulum

They are so powerful that they can break even complex organic matter

Lysosmes are waste disposal of cell and makes the cell clean

They engulf foreign materials,bacteria,food,worn out cells

When cell is about to die

Lysosomes burst and digest its own cell also

That why lysosoems are called suicidal bags of cell

Pls draw simple figure


Vacuoles

Vacuoles are storage sacs of cell

Animals they are small
Plants they are big

Vacuoles are filled with cell sap

Gives turgidity and rigidity shape and structure to cell

They store some important substances like
Amino acids
Sugars
Protiens
Orgqnic acids

In single cell organisms
Vacuoles help  in osmo regulation

Osmoregulqtion means maintainence of water and salt levels in body

Draw figure must

Mitochondria
1.mitochondriq is called power house of cell

2.because it produces energy in the foem of ATP

3.ATP is called energy currency of cell

4.ATP is adenosine tri phosphate

5.ATP id used for doing metabolic activities

6.it has 2 membranes

7.outside layer is porous

8.inner layer is folded

9.folds increases surface area of production of ATP

10.mitochondria has its own DNA and its own ribosome

11.pls draw diagram whether asked or not see in video

Plastids

1.plastids are present only in paint cell

2.palstids are of 2 types
Chromoplasts
Leucoplasts

3.chromoplqsts are colored plastics

4.lecoplasts are colorless or white plastics

5.leucoplasts stores amino acids, protiens etc

6.chloroplast is type of plastid green in color

7.green colour is due to chlorophyll pigment

8.pigment has capacity to trap sunlight

9.trapping sunlight prepare glucose by photosynthesis

10.during photosynthesis co2 is absorbed and prepares glucose which converts to carbohydrates

11.chloroplast also have its own DNA and ribosome

12.pls draw diagram whether asked or not

Endiplasmic reticulum

1.endoplasmic reticulum is network of membrane bound sheets

2.they are round ,tubular,vehicular

3.they are having same composition as of plasma membrane

4.there are 2 types of endopqlmic rer they are rough and smooth

5.rough endoplamic reticulm is rough because ribosome are attached to it

6. As they have ribosome rer helps in making protiens

7.and these protiens goes to all parts using endo reti

8.smooth are smooth as they don't have anything attached to it

9.they help in preparation of lipids or fats

10 these lipids and proteins of rer both used in making cell membrane

11.and process is called membrane biogenesis

12.ser also often helps in detoxification in liver

13.on whole
Er functions are
Transport
Network
Frame work
Membrane biogenesis
Metabolic activities
Harmones syntheais
Enzymes synthesis
And so on

14.try to draw figures as explained in video

15.video link

https://youtu.be/wCiGkP-Jfbc

Nucleus

1.nucleus has double membrane porous layer

2.inside nucleus has nucleoplasm

3.chromatin reticulum entangled network is present

4.when cell is about to divide chro.qtin changes to chromosomes

5.chromosmes have DNA in it

6.DNA has genes in it

7.genes are units of inheritance

8.genes help in transferring character from parents to offspring

9.all the metabolic activities are under control of nucleus

10.in prokaryots nuclear wall is absent

11.all contents of nucleus are freely. Floating in cell

12.the nucleus of prokarypts are called as nucleoids

13.pls draw figure to explain as I did in video

14.video link
https://youtu.be/W5qGjsVUzPE

CELL WALL

1.plant cells only have cell wall

2.cell wall is made of cellulose

3.cellulose is complex carbohydrate which gives mechanical strength and support to plant

4.loosing water and shrinking of cell is called palsmolysis

5.gaining water and bulging is called turgidity

6.cell wall protects cell during turgidd conditions from bursting

7.so plant cell resists more than animal cell as they don't have cell wall

Plasma membrane 

1.plama membrane is selectively permeable

2.made of lipids proteins

3.endoplamic reticulum helps in synthesis of plasma membrane 

4.process if it's formation is called membrane biogenesis 

5.plamam membrane is common in animal and plant cells.

6.inside plasma membrane pritoplasm is present



Video link of this 
https://youtu.be/YF2JPPW0lEI











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