Activity 5.4 on page 60 in ncrt science book
class9 write the answer
Answers
Answer:
Concept:
Activity 5.4
Put dried raisins or apricots in plain water and leave them for some time, Then place them into a concentrated solution of sugar or
(a) Each gains water and swells when placed in water.
(b) However, when placed in the concentrated solution it loses water. and consequently shrinks.
Explanation:
Most plant cells and unicellular freshwater creatures often absorb water through osmosis. Another illustration of osmosis is the water absorption by plant roots.
Diffusion is crucial to the exchange of gases and water that occurs within a cell during its existence. The cell also receives nutrients from its surroundings in addition to this. Energy-intensive transport is used to move various molecules in and out of the cell.
The lipids and proteins that make up the plasma membrane are flexible organic molecules. However, we can only use an electron microscope to view the plasma membrane's structure.
The cell's ability to ingest food and other substances from its surrounding environment is also made possible by the flexibility of the cell membrane. Endocytosis is the term for such processes. Such procedures are used to obtain nourishment for amoebas.
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