Plant Cell

Not one of my good drawings. I'm far too lazy right now to use paint though. lol.

Plant cells contain:
-cell wall - a thick, rigid membrane that surrounds a plant cell. This layer of cellulose fiber gives the cell most of its support and structure. The cell wall also bonds with other cell walls to form the structure of the plant.
-cytoplasm - the jellylike material outside the cell nucleus in which the organelles are located.
-plasma membrane - the thin layer of protein and fat that surrounds the cell, but is inside the cell wall. The cell membrane is semipermeable, allowing some substances to pass into the cell and blocking others.
-mitochondria - The mitochondria converts the energy stored in glucose into ATP (adenosine triphosphate) for the cell.
-nucleus - spherical body containing many organelles, including the nucleolus. The nucleus controls many of the functions of the cell (by controlling protein synthesis) and contains DNA (in chromosomes).
-ribosome - small organelles composed of RNA-rich cytoplasmic granules that are sites of protein synthesis.
-peroxisome - small organelles that produce hydrogen peroxide.
-Golgi appratus - packages proteins and carbohydrates into membrane-bound vesicles for "export" from the cell.
-rough endoplasmic reticulum - transport materials through the cell and produces proteins in sacks(which are sent to the Golgi apparatus, or inserted into the cell membrane).
-smooth endoplasmic reticulum - transport materials through the cell. It contains enzymes and produces and digests lipids (fats) and membrane proteins; smooth ER buds off from rough ER, moving the newly-made proteins and lipids to the Golgi apparatus and other membranes.
-chloroplast - an elongated or disc-shaped organelle containing chlorophyll; where photosynthesis takes place.
-vacuole - a large, membrane-bound space within a plant cell that is filled with fluid. Most plant cells have a single vacuole that takes up much of the cell. It helps maintain the shape of the cell.

Questions:
1. What is the central organelle in a plant cell which holds water called?

2. What three features does a plant cell have in comparison to an animal cell?

3.What relationship does a plant cell and algae have (what chemical process do they go through to obtain food)?