9th Grade > Biology
THE FUNDAMENTAL UNIT OF LIFE MCQs
Total Questions : 55
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Answer: Option A. -> True
:
A
Mitochondria are specialised cell organelles which serve as batteries, powering various functions of the cell and an organism as a whole.
They have their own genetic material and ribosomes which helps in synthesising proteins.
:
A
Mitochondria are specialised cell organelles which serve as batteries, powering various functions of the cell and an organism as a whole.
They have their own genetic material and ribosomes which helps in synthesising proteins.
:
Leucoplasts are the white or colourless plastids. They are the primary organelles for storage of materials such as starch, oils, protein granules, etc.
Example: Leucoplasts are found in root cells, pulses, groundnut, etc.
Answer: Option B. -> It allows only selective molecules to pass through it.
:
B
Plasma membrane is an external covering of the cell. It separates the contents of the cell from the external surroundings. Since, it allows the entry and exit of only certain substances (e.g., molecules, ions, etc.) it is known as a selectively permeable membrane.
:
B
Plasma membrane is an external covering of the cell. It separates the contents of the cell from the external surroundings. Since, it allows the entry and exit of only certain substances (e.g., molecules, ions, etc.) it is known as a selectively permeable membrane.
Answer: Option B. -> Lysosomes
:
B
Lysosomes are called the 'suicide bags'of the cell. They contain digestive enzymes that break down wastes, foreign substances and cellular debris. Apart from these, lysosomes also digest cells by their own protein-digesting enzymes, leading to cell death.
:
B
Lysosomes are called the 'suicide bags'of the cell. They contain digestive enzymes that break down wastes, foreign substances and cellular debris. Apart from these, lysosomes also digest cells by their own protein-digesting enzymes, leading to cell death.
Answer: Option A. -> True
:
A
Gaseslike carbon dioxide and oxygencrossthemembraneby the process of diffusion and movefrom the region of higher concentration to that of lower concentration across the cell membrane.
:
A
Gaseslike carbon dioxide and oxygencrossthemembraneby the process of diffusion and movefrom the region of higher concentration to that of lower concentration across the cell membrane.
Answer: Option A. -> plant cells only
:
A
Leucoplasts are the non-pigmented organelles which are colorless. They are usually found in most of the non-photosynthetic parts of the plant like roots. They act as a storage shed for starches, lipids, and proteins depending on the needs of plant.
:
A
Leucoplasts are the non-pigmented organelles which are colorless. They are usually found in most of the non-photosynthetic parts of the plant like roots. They act as a storage shed for starches, lipids, and proteins depending on the needs of plant.
Answer: Option B. -> chromatin
:
B
In a cell which is not dividing,DNA is present as part of chromatin fibres/material. These are called chromatin because they get coloured when they are stained. This chromatin material is visible as an entangled mass of thread-like structures. Whenever the cell is about to divide, the chromatin material gets condensed andorganised into chromosomes.
:
B
In a cell which is not dividing,DNA is present as part of chromatin fibres/material. These are called chromatin because they get coloured when they are stained. This chromatin material is visible as an entangled mass of thread-like structures. Whenever the cell is about to divide, the chromatin material gets condensed andorganised into chromosomes.
Answer: Option C. -> Golgi apparatus
:
C
The Golgi apparatus was first described by Camillo Golgi, who is renowned for his work on the nervous system.
He described the golgi apparatus as an organelle consisting of a system of membrane-bound vesicles arranged approximately parallel to each other in stacks called cisternae.
:
C
The Golgi apparatus was first described by Camillo Golgi, who is renowned for his work on the nervous system.
He described the golgi apparatus as an organelle consisting of a system of membrane-bound vesicles arranged approximately parallel to each other in stacks called cisternae.
Answer: Option C. -> Mitochondrion
:
C
The organelle depicted in the given image is a mitochondrion. It is a double-membranedorganelle with its own genetic material. Sinceit is involved in the production of energy-rich ATP (Adenosine triphopshate), it is also known as the "powerhouse of the cell".
:
C
The organelle depicted in the given image is a mitochondrion. It is a double-membranedorganelle with its own genetic material. Sinceit is involved in the production of energy-rich ATP (Adenosine triphopshate), it is also known as the "powerhouse of the cell".
Answer: Option B. -> False
:
B
The fundamental unit of life - cell, exhibits a finedivision of labour within itself. Cellular organelles are designated to performspecific functions responsible for the normal metabolism of the cell, such as making new material in the cell, clearing up the waste material from the cell and so on.
:
B
The fundamental unit of life - cell, exhibits a finedivision of labour within itself. Cellular organelles are designated to performspecific functions responsible for the normal metabolism of the cell, such as making new material in the cell, clearing up the waste material from the cell and so on.