Fundamental Unit Of Life-Cell - Class 9 MCQ

The animal cell is heterotrophic, i.e., cannot synthesize their own food. They have to obtain food from other organisms. Plant cells possess chloroplast using which they can synthesize their own food material, i.e., they are autotrophic. Therefore, their mode of nutrition differs.

Exosmosis. noun. The passage of a fluid through a semipermeable membrane toward a solution of lower concentration, especially the passage of water through a cell membrane into the surrounding medium.Plasmolysis is the process in which cells lose water in a hypertonic solution. The reverse process, cytolysis, can occur if the cell is in a hypotonic solution resulting in a lower external osmotic pressure and a net flow of water into the cell.

A hypotonic solution consists of more amount of solvent and less amount of solute in it. Water is free to move in and out of the cell through a process called osmosis. But in this case more amount of water will enter the cell than leave. Hence, the cell will swell up. Therefore, option (C) is correct.

Aleuroplasts in a cell store:

• Protein: Aleuroplasts store proteins, which are important for various cellular functions and processes.


• Starch: Aleuroplasts also store starch, which serves as a reserve of energy for the cell.


• Nutrients: Aleuroplasts store other essential nutrients required by the cell for growth and metabolism.


• Matrix: Aleuroplasts have a matrix that helps in organizing and storing various substances within the organelle.

Explanation:
Aleuroplasts are specialized plastids found in plant cells. They are responsible for the synthesis, storage, and metabolism of various substances. Here is a detailed explanation of what aleuroplasts store:
Protein: Aleuroplasts store proteins, which are essential molecules involved in various cellular processes. Proteins are important for cell structure, enzymatic reactions, cell signaling, and many other functions.
Starch: Aleuroplasts also store starch, which is a complex carbohydrate made up of glucose molecules. Starch serves as an energy reserve for the cell. It can be broken down into glucose when the cell requires energy for metabolic activities.
Nutrients: Aleuroplasts store other essential nutrients required by the cell, such as vitamins, minerals, and organic compounds. These nutrients are necessary for the proper functioning and growth of the cell.
Matrix: Aleuroplasts have a matrix, or a gel-like substance, that helps in organizing and storing various substances within the organelle. The matrix provides structural support and maintains the integrity of the aleuroplasts.
In conclusion, aleuroplasts in a cell store proteins, starch for energy storage, other nutrients, and have a matrix that aids in the organization and storage of substances.

Blue-green algae or cyanobacteria is a prokaryotic organism, i.e., it lacks well defined nucleus, whereas diatoms, algae and yeast all are eukaryotic organism, i.e., they show the presence of true nucleus and cell membrane bound organelles.