Tag: number and shape of cells

Questions Related to number and shape of cells

Any specialized plant cell that is dispersed among cells of a different kind is called a

biology organization of life the cell structure cytoplasm number and shape of cells

  1. Marcophyll

  2. Xenophyte

  3. Normoblast

  4. ldioblast

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Correct Option: D
Explanation:
An idioblast is an isolated plant cell that differs from neighboring tissues. They have various functions such as storage of reserves, excretory materials, pigments, and minerals. They could contain oil, latex, gum, resin, tannin or pigments etc. So, the correct answer is "Idioblast."

Dedifferentiated cells are formed in the region of

biology organization of life the cell structure cytoplasm number and shape of cells

  1. Injury.

  2. Regeneration.

  3. Secondary growth.

  4. All of the above.

Show answer
Correct Option: D
Explanation:

An undividable differentiated cell sometimes gains the power to divide. This process is called dedifferentiation. Wound healing after injury and secondary growth in plants are some of the best examples of dedifferentiation. Dedifferentiation is one of the mechanisms of natural regeneration. So answer D is correct.

Jute fibres have a length of

biology cell-the basic unit of life number and shape of cells unicellular and multicellular organisms cell parameters diversity and classification in animals

  1. $30-40mm$

  2. $300-400\mu m$

  3. $30-90cm$

  4. $3-9m$

Show answer
Correct Option: C

The smallest human cell is

biology cell-the basic unit of life number and shape of cells unicellular and multicellular organisms cell parameters diversity and classification in animals

  1. Erythrocyte

  2. Kidney cell

  3. Liver cell

  4. Sperm

Show answer
Correct Option: A
Explanation:

  • Erythrocytes or red blood cells (RBC) are the most abundant of all the cells in the blood. A healthy adult man has, on an average, 5 million to 5.5 millions of RBCs mm–3 of blood. It is Biconcave in size.
  • A typical human red blood cell has a disk diameter of approximately 6.2–8.2 µm and a thickness at the thickest point of 2–2.5 µm and a minimum thickness in the centre of 0.8–1 µm, being much smaller than most other human cells. Hence The smallest human cell is  Erythrocyte.
  • So, the correct answer is 'Erythrocyte'.

    • Longest cell in human body may be_____________.

    biology cell-the basic unit of life number and shape of cells unicellular and multicellular organisms cell parameters diversity and classification in animals

    1. Nerve cell

    2. Leg muscle cell

    3. Bone cell

    4. Heart muscle cell

    Show answer
    Correct Option: A
    Explanation:

    A neuron is a nerve cell that is the basic building block of the nervous system. Neurons are similar to other cells in the human body in a number of ways, but there is one key difference between neurons and other cells. Neurons are specialized to transmit information throughout the body. Nerve cell or neuron possess a cell body with a long, thin hair like axon. A nerve cell can be up to a metre long. 

    Dendrites are a part of 

    biology cell-the basic unit of life number and shape of cells unicellular and multicellular organisms cell parameters diversity and classification in animals

    1. Grey matter

    2. White matter

    3. Dura mater

    4. Arachnoid mater

    Show answer
    Correct Option: A

    Correct arrangement of the following in increasing size is
    (i) Width of biological membrane.
    (ii) Diameter of E.coli DNA
    (iii) Human ribosome
    (iv) Length of E.coli DNA
    (v) Diameter of human liver cell.

    biology cell-the basic unit of life number and shape of cells unicellular and multicellular organisms cell parameters diversity and classification in animals

    1. i, iii, ii, iv, v

    2. ii, i, iii, iv, v

    3. i, iii, ii, v, iv

    4. ii, iii, i, iv, v

    Show answer
    Correct Option: C
    Explanation:

    Answer :
    i) Biological Membranes are typically 7.5–10 nm in thickness with two regular layers of lipid molecules.
    ii) E coli cells are typically rod-shaped, and are about 2.0 μm long and 0.25–1.0 μm in diameter.
    iii) Prokaryotic ribosomes are around 20 nm in diameter.
    iv) E.coli chromosomes have about 4.7 x 10^6 base pairs which results in a length of 1.6 mm.
    v) Diameter of human liver cell 50–100µm
    So correct answer is option C. i, iii, ii, v, iv.

    Which of the following cells are round and biconcave in shape?

    biology cell-the basic unit of life number and shape of cells unicellular and multicellular organisms cell parameters diversity and classification in animals

    1. White blood cells

    2. Red blood cells

    3. Columnar epithelial cells

    4. Nerve cells

    5. Mesophyll cells

    Show answer
    Correct Option: B
    Explanation:
    • An erythrocyte is a cell containing large amounts of hemoglobin and specialized for oxygen transport. In mammals, erythrocytes are round and biconcave in shape. 
    • They are devoid of nucleus and other membrane-bound organelles. They derive energy through glycolysis and serve as tiny packets of hemoglobin.

    The longest cell in the human body is

    biology cell-the basic unit of life number and shape of cells unicellular and multicellular organisms cell parameters diversity and classification in animals

    1. Nerve cell

    2. Muscle cell

    3. Liver cell

    4. Kidney cell

    Show answer
    Correct Option: A
    Explanation:
    Nerve cell is considered as the longest cell of the body. It is the abundantly traced in the brain. It carries the nerve stimulus from the organs to the brain. It also carries the nerve response from the brain to the effector organs.
    So, the correct answer is option A.

    Which one is smallest cell?

    biology cell-the basic unit of life number and shape of cells unicellular and multicellular organisms cell parameters diversity and classification in animals

    1. Bacteria

    2. Parenchyma

    3. PPLO

    4. Virus

    Show answer
    Correct Option: C
    Explanation:

    The cell is the structural unit of life with various shapes and size. The size of the cell ranges from 0.5 micrometers to 100 micrometers. Mycoplasma gallicepticum, a parasitic bacterium is thought to be the smallest known organisms with the size from 0.2 to 0.3 micrometer, capable of independent growth and reproduction. Later, the name for mycoplasma was pleuropneumonia-like organisms or PPLO.