Question

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Answer 1

» Required Answers:

1. Which of the following is able to change its shape?

$\implies \red \bigstar$ ${\boxed {\tt { Option \: C ( Both \: A \: and \: B) }}}$

2. Who acts as control centre of activities of the cell?

$\implies \red \bigstar$ ${\boxed {\tt { Option \: A ( Nucleus)!! }}}$

3. What did Robert Hooke discover?

$\implies \red \bigstar$ ${\boxed {\tt { Option \: B ( Cell)!! }}}$

4. Which organelle is essential for photosynthesis in plants?

$\implies \red \bigstar$ ${\boxed {\tt { Option \: D ( Chloroplast)!! }}}$

5. What is the basic structural and functional unit of life?

$\implies \red \bigstar$ ${\boxed {\tt { Option \: C ( Cell)!! }}}$

6. Which of the following is the largest animal cell?

$\implies \red \bigstar$ ${\boxed {\tt { Option \: B ( Egg \: of \: an \: ostrich)!! }}}$

7. Which of the following are prokaryotes?

$\implies \red \bigstar$ ${\boxed {\tt { Option \: D ( Bacteria,Blue green algae )!! }}}$

8. Who gives shape and rigidity to the cell?

$\implies \red \bigstar$ ${\boxed {\tt { Option \: A ( Cell \: wall)!! }}}$

9. Which animal cell is long and branched?

$\implies \red \bigstar$ ${\boxed {\tt { Option \: B ( Nerve \: cell)!! }}}$

10. Which of the following is absent in an animal cell?

$\implies \red \bigstar$ ${\boxed {\tt { Option \: D ( Chloroplasts)!! }}}$

11. Which cells receives and transfers messages?

$\implies \red \bigstar$ ${\boxed {\tt { Option \: A ( Nerve \: cell)!! }}}$

12. Which is a unit of inheritance in living organisms?

$\implies \red \bigstar$ ${\boxed {\tt { Option \: B ( Gene)!! }}}$

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» Explanation:

• 1 ) $\red \bigstar$ ${\boxed {\tt { Option \: C ( Both \: A \: and \: B) }}}$

$\implies$ White Blood Cells and Amoeba , both are animal cells and don't have cell wall, they only have cell/plasma memberane which makes them flexible and can change their shapes.

• 2 ) $\red \bigstar$ ${\boxed {\tt { Option \: A ( Nucleus)!! }}}$

$\implies$ Nucleus is one of the most important part in cell, because it controls all the activities of the cell. It was discovered by Robert Brown.

• 3 ) $\red \bigstar$ ${\boxed {\tt { Option \: B ( Cell)!! }}}$

$\implies$ Robert Hooke discovered the cell in 1665. This discovery was made when he was seeing a thin piece of cork with his crude microscope and he found that there were very tiny honeycomb like structures and he named it cell.

• 4 ) $\red \bigstar$ ${\boxed {\tt { Option \: D ( Chloroplast)!! }}}$

$\implies$ This organelle is essential for photosynthesis because chloroplast provides green pigment called chlorophyll to plants and chlorophyll is important component for photosynthesis.

• 5 ) $\red \bigstar$ ${\boxed {\tt { Option \: C ( Cell)!! }}}$

$\implies$ Cell is the basic structural and functional unit of life because cell is the smallest part of which all the living organisms are made.

• 6 ) $\red \bigstar$ ${\boxed {\tt { Option \: B ( Egg \: of \: an \: ostrich)!! }}}$

$\implies$ Egg is also a cell, and biggest animal cell is egg of an ostrich. It is 17 cm in size.

• 7 ) $\red \bigstar$ ${\boxed {\tt { Option \: D ( Bacteria,Blue green algae )!! }}}$

$\implies$ Bacteria and Blue Green algae have not well organized nucleus, there is no nuclear membrane. That's why they come in the category of prokaryotes.

• 8 )$\implies \red \bigstar$ ${\boxed {\tt { Option \: A ( Cell \: wall)!! }}}$

$\implies$ Cell wall provides rigidity to the cell as they are very tough. They are protective and outermost covering of the cell. They are only found in plant cells.

• 9 )$\red \bigstar$ ${\boxed {\tt { Option \: B ( Nerve \: cell)!! }}}$

$\implies$ Nerve cells have longest structures as they have exons which makes the nerve cells longest.

• 10) $\red \bigstar$ ${\boxed {\tt { Option \: D ( Chloroplasts)!! }}}$

$\implies$Chloroplasts are only present in plants cell because it gives green pigment called chlorophyll to leaf, they are absent in animal cell.

• 11 ) $\red \bigstar$ ${\boxed {\tt { Option \: A ( Nerve \: cell)!! }}}$

$\implies$ The nerve cells have function to receive and transfer the message.

• 12 )$\red \bigstar$ ${\boxed {\tt { Option \: B ( Gene)!! }}}$

$\implies$ Gene are the unit of inheritance.Genes are found in chromosomes which are responsible for the traits from one generation to another.

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