SORT ANSWER TYPE QUESTIONS
Why is cell membrane called selectively permeable ?
Name the cell organelles embeded in cytoplasm.
What are unicellular organisms ? Name two unicellular organisam
Name the different parts of a cell.
Why plastids are important for plants ?
Answers
Answer:
The plasma membrane is called aselectively permeable membrane as it permits the movement of only certain molecules in and out of the cells. ... As the plasma membrane acts as a mechanical barrier, the exchange of material from its surroundings through osmosis or diffusion in a cell won't take place.
Organelles (literally "little organs"), are usually membrane-bound structures inside the cell that have specific functions. Some majororganelles that are suspended in thecytosol are the mitochondria, the endoplasmic reticulum, the Golgi apparatus, vacuoles, lysosomes, and in plant cells, chloroplasts.
Unicellular organisms refer to living entities that have only one cell, and thecell is responsible for performing allthe functions. Some examples are amoeba, paramecium, bacteria, and cyanobacteria. Although some prokaryotes live in colonies, they are not specialised into cells with differing functions.
A cell consists of three parts: the cell membrane, the nucleus, and, between the two, the cytoplasm. Within thecytoplasm lie intricate arrangements of fine fibers and hundreds or even thousands of miniscule but distinct structures called organelles.
Plastids are the site of manufacture and storage of important chemical compounds used by the cells of autotrophic eukaryotes. They often contain pigments used in photosynthesis, and the types of pigments in a plastid determine the cell's color. That's why plastids are important in a plant.