Give an important function of cell membrane.
7. Which type of cell evolved first, prokaryotic or eukaryotic? Give two examples of each.
8.
What are cell organelles? Which organelle of the cell structure is responsible for intracellular digestion?
9.
What are plastids? Classify them and write functions of each type of plastid.
Answers
Answer:
Functions of cell membrane
Explanation:
The plasma membrane, or the cell membrane, provides protection for a cell. It also provides a fixed environment inside the cell, and that membrane has several different functions. One is to transport nutrients into the cell and also to transport toxic substances out of the cell
Answer:
7) Eukaryotic cells are evolved first . Eukaryotic cells examples :- Animals and plants . Prokaryotic cells examples :- bacteria , blue-green algae .
8)The primary sites of intracellular digestion are organelles known as the lysosomes, which are membrane-bounded compartments containing a variety of hydrolytic enzymes
9) Plastids are double-membrane organelles which are found in the cells of plants and algae. Plastids are responsible for manufacturing and storing of food. These often contain pigments that are used in photosynthesis and different types of pigments that can change the colour of the cell.