Tag: cell theory, cell specialization, and cell replacement

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

Metabolically active cells have

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

  1. Lower nucleocytoplasmic ratio.

  2. Higher nucleocytoplasmic ratio.

  3. Higher surface: volume ratio.

  4. Both B and C.

Show answer
Correct Option: D

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

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

  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 $10-100\mu {m}^{3}$

Show answer
Correct Option: A

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 _______________.

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

  1. $32 \times 10^5$ cells

  2. $5 \times 10^5$ cells

  3. $35 \times 10^5$ cells

  4. $175 \times 10^5$ cells

Show answer
Correct Option: A
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.

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.

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

  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.

Show answer
Correct Option: D
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.'

The average volume of a eukaryotic cell is

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

  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 $\mu \, m^3$

Show answer
Correct Option: A
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'.