Assertion (A): A distinct centrally located spherical structure in a cell is called Nucleus.
Reason (R): Nucleus is surrounded by a jelly like structure called cytoplasm.
To solve this question, we need to evaluate both the assertion (A) and the reason (R), and then determine the relationship between them.
- Assertion (A): "A distinct centrally located spherical structure in a cell is called Nucleus."
- This statement is true. The nucleus is indeed a distinct spherical structure found within many eukaryotic cells. It is centrally located and acts as the control center of the cell, housing the majority of the cell's genetic material in the form of DNA.
- Reason (R): "Nucleus is surrounded by a jelly-like structure called cytoplasm."
- This statement is also true. The nucleus is indeed surrounded by cytoplasm. The cytoplasm is the jelly-like substance that fills the cell and surrounds the nucleus, containing all the other cell organelles.
Both statements are accurate individually; however, the reason (R) provided is not explaining the distinctiveness or the centrality of the nucleus itself. Instead, it is merely stating the fact about the presence of cytoplasm around the nucleus.
Therefore, the correct answer is: Both (A) and (R) are true but (R) is not the correct explanation of (A).
Important Questions from Cell Structure
A group of ribosomes attached to mRNA is known as :
Within the nucleus of eukaryotic cells, which of the following structures contains the tightly coiled genetic material?
Chromosomes are composed of DNA and:
Bacteria have an undefined nuclear region which lacks a nuclear membrane and contains only DNA without proteins. Such a region is called:
Which of the following statements is/are correct?
I. Amoeba ingests its food with the help of pseudopodia.
II. Amoeba constantly changes its shape and position.
