Which of the following statements is correct?

Plant cells have cell wall while animal cells do not.

Plant cells have vacuole while animal cells do not.

All plant cells have chloroplasts while animal cells do not.

Plant cells have cell wall while animal cells do not.

Plant cells do not have mitochondria.

Which of the followings is not a correct description?

The image under light microscope has higher resolution than that under electron microscope.

Light microscope uses lens for focusing while electron microscope uses magnetic field for focusing.

The image under light microscope is with colours while the image under electron microscope is black and white.

The image under light microscope has higher resolution than that under electron microscope.

Light microscope makes use of light while electron microscope makes use of electron beams.

Biology Chapter 3 Cellular Organisation

1.

What is the permeability of cell membrane?
- A.
  
  Differentially permeable
- B.
  
  Fully permeable
- C.
  
  Not permeable
- D.
  
  Directly permeable
Correct Answer
A. Differentially permeable

Explanation
The correct answer is differentially permeable. This term refers to the property of the cell membrane that allows certain substances to pass through while restricting the passage of others. The cell membrane is selectively permeable, meaning it regulates the movement of molecules and ions in and out of the cell. It controls the exchange of essential nutrients and waste products, maintaining the internal environment of the cell. This characteristic is crucial for cellular function and homeostasis.

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2.

Which of the followings contains the largest amount of mitochondria?
- A.
  
  Red blood cells
- B.
  
  Bacteria
- C.
  
  Fat cells
- D.
  
  Sperms
Correct Answer
D. Sperms

Explanation
Red blood cells do not have mitochondria.
Although bacteria can carry out respiration, they do not have mitochondria. They have infolding membrane to perform the respiration.
Fat cells are not active. They do not need many mitochondria.
Sperms require many mitochondria to provide a lot of energy for swimming.

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3.

Where is lipid produced in a cell?
- A.
  
  Rough endoplasmic reticulum
- B.
  
  Smooth endoplasmic reticulum
- C.
  
  Mitochondrion
- D.
  
  Nucleolus
Correct Answer
B. Smooth endoplasmic reticulum

Explanation
Lipids are produced in the smooth endoplasmic reticulum (SER) of a cell. The SER is responsible for the synthesis of lipids, including phospholipids, steroids, and triglycerides. It does not have ribosomes attached to its surface, unlike the rough endoplasmic reticulum (RER). The RER is involved in protein synthesis. The mitochondrion is responsible for energy production in the form of ATP, and the nucleolus is involved in the production of ribosomes. Therefore, the correct answer is the smooth endoplasmic reticulum.

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4.

Which of the following statements is correct?
- A.
  
  Plant cells have vacuole while animal cells do not.
- B.
  
  All plant cells have chloroplasts while animal cells do not.
- C.
  
  Plant cells have cell wall while animal cells do not.
- D.
  
  Plant cells do not have mitochondria.
Correct Answer
C. Plant cells have cell wall while animal cells do not.

Explanation
Animal cells may have no vacuole or small vacuoles.
Not all plant cells have chloroplasts.
Plant cells also have mitochondria. They require energy for growth and repair etc.

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5.

Which of the followings is not an organelle?
- A.
  
  Nucleus
- B.
  
  Endoplasmic reticulum
- C.
  
  Vacuole
- D.
  
  Cell wall
Correct Answer
D. Cell wall

Explanation
Organelles are the structures in the cytoplasm. Cell wall is not in the cytoplasm.

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6.

Which of the followings do not have a double membrane?
- A.
  
  Mitochondrion
- B.
  
  Vacuole
- C.
  
  Nucleus
- D.
  
  Chloroplast
Correct Answer
B. Vacuole

Explanation
Vacuole only has a single membrane, not double.

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7.

When we put a layer of onion epidermis under the light microscope, which of the followings can be seen?
- A.
  
  Chloroplast
- B.
  
  Mitochondria
- C.
  
  Cell wall
- D.
  
  Endoplasmic reticulum
Correct Answer
C. Cell wall

Explanation
When we put a layer of onion epidermis under the light microscope, we can see the cell wall. The cell wall is a rigid structure that surrounds the cell membrane and provides support and protection to the cell. It is made up of cellulose and can be easily observed under a light microscope as a clear, outer layer surrounding the cell.

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8.

Which of the followings is not a correct description?
- A.
  
  Light microscope uses lens for focusing while electron microscope uses magnetic field for focusing.
- B.
  
  The image under light microscope is with colours while the image under electron microscope is black and white.
- C.
  
  The image under light microscope has higher resolution than that under electron microscope.
- D.
  
  Light microscope makes use of light while electron microscope makes use of electron beams.
Correct Answer
C. The image under light microscope has higher resolution than that under electron microscope.

Explanation
The statement "The image under light microscope has higher resolution than that under electron microscope" is not a correct description because electron microscopes have much higher resolution than light microscopes. Electron microscopes use a beam of electrons instead of light, allowing them to achieve much higher magnification and resolution.

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9.

The total magnification of a light microscope is 400X. If the magnification of the objective is 10X, what is the magnification of the eyepiece?
- A.
  
  40X
- B.
  
  390X
- C.
  
  10X
- D.
  
  4000X
Correct Answer
A. 40X

Explanation
The total magnification of a light microscope is calculated by multiplying the magnification of the objective lens with the magnification of the eyepiece. In this case, the total magnification is given as 400X and the magnification of the objective lens is 10X. To find the magnification of the eyepiece, we divide the total magnification by the magnification of the objective lens. Therefore, the magnification of the eyepiece is 400X / 10X = 40X.

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10.

If you find the image under light microscope too dim, which part should you adjust?
- A.
  
  Iris diaphragm
- B.
  
  Coarse adjustment knob
- C.
  
  Eyepiece
- D.
  
  Fine adjustment knob
Correct Answer
A. Iris diaphragm

Explanation
To adjust the brightness of the image under a light microscope, you should adjust the iris diaphragm. The iris diaphragm is a part of the microscope that controls the amount of light passing through the specimen. By adjusting the iris diaphragm, you can increase or decrease the amount of light entering the microscope, thereby making the image brighter or dimmer.

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Biology Chapter 3 Cellular Organisation

What is the permeability of cell membrane?

Which of the followings contains the largest amount of mitochondria?

Where is lipid produced in a cell?

Which of the following statements is correct?

Which of the followings is not an organelle?

Which of the followings do not have a double membrane?

When we put a layer of onion epidermis under the light microscope, which of the followings can be seen?

Which of the followings is not a correct description?

The total magnification of a light microscope is 400X. If the magnification of the objective is 10X, what is the magnification of the eyepiece?

If you find the image under light microscope too dim, which part should you adjust?