Science?.....................................................?

Question

Who can tell me what the chloroplast of a cell does?Whoever has the best answer gets ten points!

Answer 1

Chloroplasts are organelles found in plant cells and eukaryotic algae that conduct photosynthesis. Chloroplasts capture light energy from the sun to produce the free energy stored in ATP and NADPH through a process called photosynthesis. It is derived from the Greek words chloros which means green and plast which means organelle or cell.

Chloroplasts are flat discs usually 2-10 micrometer in diameter and 1 micrometer thick. The chloroplast has a two membrane envelope termed the Inner & Outer membrane respectively. Between these two layers is the Intermembrane space.

The fluid within the chloroplast is called the stroma, corresponding to the cytoplasm of the bacterium, and contains tiny circular DNA and ribosomes, though most of their proteins are encoded by genes contained in the cell nucleus, with the protein products trafficked to the chloroplast.

Within the stroma are stacks of thylakoids, the sub-organelles where photosynthesis actually takes place. A stack of thylakoids is called a granum (plural: grana). A thylakoid looks like a flattened disk, and inside is an empty area called the thylakoid space or lumen. The photosynthesis reaction takes place on the membrane of the thylakoid, and, as is also the case with mitochondria, involves the coupling of cross-membrane fluxes with biosynthesis.

Answer 2

Chloroplasts capture light energy from the sun to produce the free energy through a process called photosynthesis. It is derived from the Greek words chloros which means green and plast which means organelle or cell.

Answer 3

chloroplast of a cell is an organelle of a cell.It is broadly divided into two main parts: 1)Grana made up of stacks of lamaller structures called thylakoid which consists of chlorophyll.2) Stroma which consists of photosynthetic enzymes, and where the synthesis of co2 takes place for prduction of glucos.
THE PROCESS:
the chlorophyll present in the thylakoid of the thylakoid of the chloroplast recieve photons(packets of light) and get excited and emit electrons.these electrons are used for carrying a number of reactions in the Grana region of the chloroplast. these reactions are together termed as light reactions.Here water molecule is broken down to release oxygen. ADP is converted to ATP. Nadp is reduced to NADPH2.
Next stage is the dark reaction which take place in the stroma of the chlorplast. These set of reations don't require sunlight but take place directly after light reactions. here also a series of reactions take place. First ribulose biphosphate accepts the co2 from atmosphere. It is then synthesised to glucose(C6H12O6). The ATP is converted back to ADP and NADPH2 to NADP

Answer 4

chloroplast is present in all plants &green algae to capture light energy and produce free energy (atp,nadph) chloroplast is green becuse of green pigment, chlorophyll
it is a double menmbraned structure containing fluid stroma which has slack of thylakods called grsnum

Answer 5

the chloroplast is the engine which provides energy through photosynthesis.