Term 3~

Term 3! Another rocking term!

This term, the science topics are getting harder! There are big topics such as Digestion, Osmosis and Diffusion! Must work hard!

Cells

There are two kind of cells we have learnt, an animal cell and a plant cell.

Parts of a Cell and their Functions

For both animal cell and plant cell:


Cell Membrane: The cell membrane is the outer most part of the cell which encloses all the other cell organelles. It controls the influx of the nutrients and minerals in and out of the cell.

Cell Cytoplasm: Cytoplasm is mainly made up of water and protein material. The cytoplasm is the key site wherein all life processes occur.

Nucleus: Cell nucleus is supposed to be the brain or the control center of the cell and thus one of the most important animal cell parts. It contains DNA and the chromosomes.

Vacuoles: Smaller gas and membrane vacuoles filled with fluids and water are present in animal cells.
Their main function is storage.

Mitochondria: Mitochondria are the so call engine house of the cells. They combines Oxygen with glucose to form energy 

For Plant cell only:

Chloroplast: They are organelles responsible for photosynthetic activity. They contains chlorophyll,which helps in harvesting light energy and converting it to chemical energy for the cells.

Cell Wall: Cell wall is the outermost tough and rigid layer of a plant cell. The prime functions of cell wall are protection, giving structural support and helping in the filter mechanism. 

Diffusion and Osmosis

Diffusion: It is the spread of particles through random motion from regions of higher concentration to regions of lower concentration. 

Osmosis:  the movement of solvent molecules through a selectively permeable membrane into a region of higher solute concentration.