Why do plant cells need these two (2) organelles while animal cells do not?
Which two organelles? I'm thinking chloroplasts and cell walls. Going by that supposition, green plants need chloroplasts to hold chlorophyll and the membrane system on which photosynthesis takes place. Only green plants can perform photosynthesis, so animal cells do not have this organelle. Plants do not have skeletons, while higher animals have carapaces, exoskeletons and internal skeletons for support. Therefore, to resist gravity and to hold plants upright, plant cells need a thick cellulose cell wall for support, which is not necessary in animal cells.
chloroplast - an elongated or disc-shaped organelle containing chlorophyll. Photosynthesis (in which energy from sunlight is converted into chemical energy - food) takes place in the chloroplasts animal cells do not have this organelle In plant cells, the cell wall is a tough, rigid structure that may consist of: (1) the primary cell wall which is generally a thin, flexible and extensible layer composed of cellulose, pectin and hemicellulose, and a secondary cell wall which is a thick layer rich in lignin that strengthens and waterproofs the wall and is formed inside the primary cell wall that has stopped increasing in surface area when the cell is fully grown. In between the primary walls is a middle lamella which is a pectin-rich intercellular material that glues the adjacent cells together. The cell wall is very essential in plants as it helps resist osmotic pressure.
i think chloroplasts and central vacuoles
am i right
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