Tag: number and shape of cells

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Multiple choice botany living world of animals number and shape of cells unicellular and multicellular organisms diversity and classification in animals

Which of these is a multicellular organism?

  1. Amoeba

  2. Paramoecium

  3. Human beings

  4. None of these
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
A. Amoeba is a single-celled eukaryotic organism that moves by the means of pseudopodia.
B. Paramoecium is a unicellular eukaryotic organism. It is a ciliate.
C. Human beings are the multicellular primates, scientifically known as Homo sapiens.
So, the correct answer is 'Human beings'.
Multiple choice botany living world of animals number and shape of cells unicellular and multicellular organisms diversity and classification in animals

Which one from the following is an example of multicellular organism?

  1. Chlamydomonas

  2. Bacteria

  3. Snake

  4. Amoeba
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
The cell is the structural unit of life. Unicellular organisms are made up of one cell that performs all the functions e.g., bacteria, amoeba, Chlamydomonas. Whereas, multicellular organisms are made up of numbers of cells and a differnt group of cells perform a different function to maintain life. Snake is an example of the multicellular eukaryotic organism.
Multiple choice botany living world of animals number and shape of cells unicellular and multicellular organisms diversity and classification in animals cell parameters

Efficient large-sized cells are

  1. Elongated

  2. Elongated or branched

  3. With large surface area

  4. Having microvilli
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

  • Generally, cells are small so they can have an efficient surface area to volume ratio. Cells are so small so they can diffuse faster and all their processes will be a lot faster because of the smaller size of the cell.
  • For the large sized cells to become Efficient the cells must be elongated in order to have an efficient surface area to volume ratio.
  • Hence efficient large-sized cells are elongated.
  • So, the correct answer is 'Elongated'.

    • Multiple choice botany living world of animals number and shape of cells unicellular and multicellular organisms diversity and classification in animals the cell structure cytoplasm cell parameters

    Which of following organisms can be seen only under the microscope?

    1. Unicellular

    2. Multicellular

    3. Vertebrates

    4. All of the above
    Reveal answer Fill a bubble to check yourself
    A Correct answer
    Explanation
    • Most unicellular organisms are of microscopic size and are thus classified as microorganisms, for example, Phytoplankton and protozoa range from about 0.001 mm to about 0.25 mm.
    • Most of the multicellular organisms and vertebrates are visible to the naked eye, which means that it is possible to view them without using the microscope.
      So, option A is the correct answer.
    Multiple choice botany cell theory, cell specialization, and cell replacement number and shape of cells unicellular and multicellular organisms diversity and classification in animals

    Which one is enucleated?

    1. Squamous epithelial cells

    2. Mature leucocyte of man

    3. Mature erythrocyte of frog

    4. Mature erythrocyte of man

    5. Osteocyte in man
    Reveal answer Fill a bubble to check yourself
    D Correct answer
    Explanation

    • Enucleation is the phenomenon in which the nucleus is removed. Enucleation occurs roughly when the cell has reached maturity.
    • Red blood cells or Erythrocytes are initially produced in the bone marrow with a nucleus. They then undergo a process known as enucleation.
    • Enucleation allows the red blood cell to contain more hemoglobin and therefore, carry more oxygen molecules. It also allows the cell to have its distinctive bi-concave shape which aids diffusion. This shape would not be possible if the cell had a nucleus in the way. Hence mature erythrocyte of man is enucleated.
    • So, the correct answer is 'Mature erythrocyte of man'.

    Multiple choice botany cell theory, cell specialization, and cell replacement number and shape of cells unicellular and multicellular organisms diversity and classification in animals

    Forthe formation of diploid cells from haploid cells, colchicine is used to

    1. Stop the spindle fibres formation

    2. Replicate DNA twicely in one cell cycle

    3. Stop the formation of centromere

    4. Stop the mitotic division
    Reveal answer Fill a bubble to check yourself
    A Correct answer
    Explanation

    Colchicine is an alkaloid that inhibits microtubule polymerization by binding to tubulin. This prevents the formation of spindle fibers during mitosis, leading to polyploidy.

    Multiple choice botany cell theory, cell specialization, and cell replacement number and shape of cells unicellular and multicellular organisms diversity and classification in animals

    Growth at cellular level, is principally a consequence of increase in the amount of

    1. Protoplasm

    2. DNA

    3. Cell wall

    4. Cell organelles
    Reveal answer Fill a bubble to check yourself
    A Correct answer
    Explanation

    Protoplasm comprises of cytoplasm, nucleus and other cell organelles. Growth at cellular level includes increase in size of nucleus and other cell organelles. The growth at cellular level is a result of increase in amount of protoplasm.

    Thus, the correct answer is 'Protoplasm.'

    Multiple choice botany cell theory, cell specialization, and cell replacement number and shape of cells unicellular and multicellular organisms diversity and classification in animals

    Which of the following factors affect a cell's surface area to volume ratio?
    (I) Cell size
    (II) Presence of selectively permeable membrane
    (III) Presence of a convoluted membrane
    (IV) Presence of many membrane transport protein

    1. (I) only

    2. (I), (II), (III) only

    3. (I) and (III) only

    4. (III) and (IV) only
    Reveal answer Fill a bubble to check yourself
    A Correct answer
    Explanation

    The surface area to volume ratio is primarily determined by the physical dimensions (size) of the cell. While membrane structure affects transport efficiency, the geometric ratio itself is a function of the cell's size and shape.

    Multiple choice botany cell theory, cell specialization, and cell replacement number and shape of cells unicellular and multicellular organisms diversity and classification in animals

    Refer to the following table for your possible answer.

    Cell types analysed Average mass of DNA/cell (x $10^{-11}$g)
    X $0.00$
    Y $3.35$
    Kidney $6.70$
    Lung $6.70$

    What is the correct identify of cell type X and Y?

    1. X-sperm cell, Y-liver cell

    2. X-liver cell, Y-smooth muscle cell

    3. X-smooth muscle cell, Y-mature red blood cell

    4. X-mature red blood cell, Y-sperm cell
    Reveal answer Fill a bubble to check yourself
    D Correct answer