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The Fundamental Unit of Life - 1 (Class IX)

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Which polysaccharide is the major constituent of fungal cell wall?

  1. Lignin

  2. Cellulose

  3. Pectin

  4. Chitin

  5. Hemicellulose


Correct Option: D
Explanation:

Fungi possess cell walls made of the glucosamine polymer 'chitin'. It is a polymer of nitrogen-containing polysaccharide rendering a tough protective covering or structural support in certain organisms.

Which of the following cells is not eukaryotic?

  1. Onion cell

  2. Cheek cell

  3. Fungal cell

  4. Bacterial cell


Correct Option: D
Explanation:

Bacteria are called prokaryotes as they do not have a well-defined nuclear membrane around the nucleus of their cell.

How many cells are present in prokaryotic organisms?

  1. Ten cells

  2. One cell only

  3. Many cells

  4. Hundred cells


Correct Option: B
Explanation:

Prokaryotes are unicellular organisms with an undefined nucleus.

Which of the following statements is true for eukaryotic cells?

  1. They do not have a nuclear membrane.

  2. They have a well-organised nucleus.

  3. They are all multicellular.

  4. Blue-green algae are eukaryotic cells.


Correct Option: B
Explanation:

They have a well-organised nucleus.

If a cell is placed in an isotonic solution, it will

  1. shrink

  2. plasmolyse

  3. swell

  4. remain unchanged


Correct Option: D
Explanation:

The size of cell will remain the same. 

Plant cells do not burst when kept in hypotonic solution due to the presence of

  1. vacuoles

  2. plastids

  3. cell wall

  4. nucleus


Correct Option: C
Explanation:

  

Which of the following cell organelles is/are semi-autonomous?

  1. Mitochondria

  2. Ribosomes

  3. Endoplasmic reticulum

  4. Golgi bodies


Correct Option: A
Explanation:

They are semi-autonomous.

Which of the following is a double membrane covering organelle?

  1. Lysosome

  2. Golgi body

  3. Peroxisome

  4. Nucleus

  5. Vacuole


Correct Option: D
Explanation:

Nucleus is a double membrane covering cell organelle.

Genes are the hereditary units that carry genetic information from one generation to another. Where are they located?

  1. On chromosomes

  2. In endoplasmic reticulum

  3. In cytosol

  4. On nuclear membrane


Correct Option: A
Explanation:

Genes are located on chromosomes inside the nucleus.

What is the function of cell wall in plants?

  1. Provides shape and flexibility to the cells

  2. Provides green colour to the leaves

  3. Provides brown colour to the bark

  4. Provides shape and rigidity to the cell


Correct Option: D
Explanation:

Cell wall provides shape and rigidity to the cell.

The thread-like structures present in the nucleus are collectively called

  1. nucleolus

  2. genes

  3. chromatin

  4. ribosomes


Correct Option: C
Explanation:

The thread-like structures present in the nucleus are collectively called chromatin.

Which of the following is present in bacterial cells, but absent in animal cells?

  1. Cytoplasm

  2. Plasma membrane

  3. Cell membrane

  4. Cell wall


Correct Option: D
Explanation:

Cell wall and cell membrane are both present in bacterial cells, while animal cells contain only cell membrane.

Which of the following cell organelles is/are associated with photorespiration?

  1. Peroxisome

  2. Glyoxysome

  3. Mesosome

  4. All of the above


Correct Option: A
Explanation:

Peroxisome is associated with photorespiration. Peroxisome is a kind of microbody. Peroxisome contains a typical enzyme involved in glycolate metabolism and photorespiration.

Fluid mosaic model was proposed by

  1. J. David Robertson

  2. Danielli and Davson

  3. Singer and Nicolson

  4. Nageli and Cramer


Correct Option: C
Explanation:

They presented the most recent model of biomembrane, according to which, membranes do not have a uniform diposition of lipids and proteins, but a mosaic of two.

Grana are a part of

  1. mitochondria

  2. chloroplasts

  3. aleurone grains

  4. starch grains


Correct Option: B
Explanation:

Chloroplasts contain grana, which are minute particles consisting of a pile of thin double platelets, containing chlorophylls and carotenoids associated with photosynthesis.

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