What are the roles of different organelles in a cell?

Functions of different cell organelles:

Nucleus: contains all the genetic material, acts as information center and tells all the organelles what to do, RNA transcription.

Mitochondria: generates energy through respiration

Endoplasmic recticulum (rough): transport and storage of material; (smooth ER): creation of lipids and fats

Ribosome: protein creation by RNA translation  

Golgi apparatus: responsible for synthesis, packing and processing of proteins

Chloroplast: responsible for glucose creation (by photosynthesis)

Cytoplasm: is region where all chemical reactions take place  and is the jelly like fluid that holds all the organelles in place inside of the cell

lysosome: responsible for breakdown of larger molecules

Flagellum (or flagella): tail like organelle, assists motion

Vacuole: helps in maintenance of homeostasis  and stores waste products or other materials like water / food

cell membrane: separates cell from the rest of the environment  and controls what comes in and out of the cell

cytoskeleton: supports cell structure

There are a number of other organelles as well but i just named some of the common ones.

water is a polar molecule. a chemical bond is a force of attraction between atoms or ions. bonds form when atoms share or transfer valence electrons. atoms form chemical bonds to achieve a full outer energy level, which is the most stable arrangement of electrons. so, false

explanation:

in h2o molecule, two water molecules are bonded by a hydrogen bond but the bond between two h - o bonds within a water molecule are covalent. the greater the electronegativity difference, the more ionic the bond is. bonds that are partly ionic are called polar covalent bonds. nonpolar covalent bonds, with equal sharing of the bond electrons, arise when the electronegativities of the two atoms are equal.