Tag: cell theory, cell specialization, and cell replacement

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Questions Related to cell theory, cell specialization, and cell replacement

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

Metabolically active cells have

  1. Lower nucleocytoplasmic ratio.

  2. Higher nucleocytoplasmic ratio.

  3. Higher surface: volume ratio.

  4. Both B and C.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Metabolically active cells require efficient exchange (high surface area to volume ratio) and often have a large nucleus to manage cellular processes (higher nucleocytoplasmic ratio).

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

Volumes of prokaryotic and eukaryotic cells are ........... respectively.

  1. $0.2-10\mu {m}^{3}$ and $1000-10000\mu {m}^{3}$
  2. $0.1-10\mu {m}^{3}$ and $100-1000\mu {m}^{3}$
  3. $0.1-5.0\mu {m}^{3}$ and $3-30\mu {m}^{3}$
  4. $0.1-1.0\mu {m}^{3}$ and $10-100\mu {m}^{3}$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Prokaryotic cells are generally much smaller, typically in the range of 0.2 to 10 cubic micrometers, while eukaryotic cells are significantly larger, ranging from 1000 to 10000 cubic micrometers.

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

A bacterium divides every 35 minutes . If a culture containing $ 10^5$ cell per ml is grown for 175 minutes. What will be the cell concentration per ml after 175 mts _______________.

  1. $32 \times 10^5$ cells
  2. $5 \times 10^5$ cells
  3. $35 \times 10^5$ cells
  4. $175 \times 10^5$ cells
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
It is given that a bacterium divides every 35 minutes,
At 0 minutes, the culture contains $ 10^5 $ cells/ml.
After 35 minutes, the culture will contain $ 2^1 \times 10^5 $ cells / ml
similarly, after 175 minutes, that is after 5 generations, the no. of cells
$ = 2^{5} \times 10^{5}$ cells/ml.
This is equal to $ 32 \times 10^{5} $ cell/ml
So, (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

Read the given statements and select the correct option.


(i) One maize root cell can give rise to more than 17,500 cells.
(ii) A cell in watermelon can increase in size upto 3,50,000 times.
(iii) The growth of pollen tube is measured in terms of length.
(iv) The growth of the leaf is measured in term of surface area.

  1. Statements (i) and (ii) are correct.

  2. Statements (iii) and (iv) are correct.

  3. Statements (i) and (iii) are correct.

  4. Statements (i), (ii), (iii) and (iv) are correct.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The root cells may give rise to more than 17,500 cells, the cells of the root undergo mitotic division in an arithmatic manner, where some of the dividing cells undergo differentiation while others continue to divide.

A water melon pulp contains about 90% of water, so the enormous increase in size of the cell is due to endosmosis.
The growth of the pollen tube is measures in $\mu$ meters
A leaf visually is a two dimensional structure hence it is measured in terms of surface area.
So, the correct answer is 'Statements (i), (ii), (iii) and (iv) are correct.'

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

The average volume of a eukaryotic cell is

  1. Between 1 $\mu \, m^3$ and 1,000 $\mu \, m^3$
  2. Between 100 $\mu \, m^3$ and 1,000 $\mu \, m^3$
  3. Between 10 $\mu \, m^3$ and 100 $\mu \, m^3$
  4. Generally greater than 10,000 $\mu \, m^3$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

A cell of 1 μm^3 volume average to the maximum 1,000 μm^3 most highly expressed proteins in a cell.

So, the correct option is 'Between 1 μm^3 and 1,000 μm^3'.