Which organelle is known as the powerhouse of the cell? Why?
Solution and Explanation
The organelle mitochondria known as the powerhouse of the cell. Process of cellular respiration takes place in mitochondria to generate energy required for various chemical activities in the form of ATP.
This is the reason that mitochondria is known as powerhouse of the cell.
Top CBSE Class IX Science Questions
- How do good animal husbandry practices benefit farmers?
- CBSE Class IX
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- Animal Husbandry
- Convert the following temperatures to the Celsius scale.
(a) 293 K
(b) 470 K- CBSE Class IX
- Science
- Can Matter Change its State?
- Convert the following temperatures to the Celsius scale.
(a) 293 K
(b) 470 K- CBSE Class IX
- Science
- Can Matter Change its State?
- Give reason for the following observations.
(a) Naphthalene balls disappear with time without leaving any solid.
(b) We can get the smell of perfume sitting several metres away.- CBSE Class IX
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- Arrange the following substances in increasing order of forces of attraction between the particles— water, sugar, oxygen.
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- Can Matter Change its State?
Top CBSE Class IX What is a Cell Made Up of? What is the Structural Organisation of a Cell? Questions
- Make a comparison and write down ways in which plant cells are different from animal cells.
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- How is a prokaryotic cell different from a eukaryotic cell?
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- What is a Cell Made Up of? What is the Structural Organisation of a Cell?
- What would happen if the plasma membrane ruptures or breaks down?
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Top CBSE Class IX Questions
- The radius of a spherical balloon increases from 7 cm to 14 cm as air is being pumped into it. Find the ratio of surface areas of the balloon in the two cases.
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(Street Plan) : A city has two main roads which cross each other at the centre of the city. These two roads are along the North-South direction and East-West direction.
All the other streets of the city run parallel to these roads and are 200 m apart. There are 5 streets in each direction. Using 1cm = 200 m, draw a model of the city on your notebook. Represent the roads/streets by single lines. There are many cross- streets in your model. A particular cross-street is made by two streets, one running in the North - South direction and another in the East - West direction. Each cross street is referred to in the following manner : If the 2nd street running in the North - South direction and 5th in the East - West direction meet at some crossing, then we will call this cross-street (2, 5). Using this convention, find:
(i) how many cross - streets can be referred to as (4, 3).
(ii) how many cross - streets can be referred to as (3, 4).
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- What are the main features of the mechanical teachers and the schoolrooms that Margie and Tommy have in the story?
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- “They can’t hang me twice.”
(i) Who says this?
(ii) Why does the speaker say it?- CBSE Class IX
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Concepts Used:
Cell: The Unit of Life
- A cell is derived as the functional and structural unit of life. Every cell is surrounded by a cell membrane that dissects the external and internal environments of the cell. The interior environment of a cell is called the cytoplasm.
- It carries cellular machinery and structural elements. The nucleus is present in the center of the cell, which includes all the hereditary information of an organism. Some of the molecules present in the cell are protein, carbohydrates, starch, and sugar.
Read More: Fundamental Unit of Life: Cell
Parts of Cell:
The different parts of a cell and their functions are as follows:
- Cell Membrane
- Cell Wall
- Nucleus
- Cytoplasm
