The given diagram represents the four different structures which one of these is correct containing material and function:-
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| a. | Nucleolus | NOR | Synthesis of rRNA for formation of 80 S Ribosome | 
| b. | Nuclear Pore | Chromatin | Exchange material between cytoplasm and nucleoplasm | 
| c. | Nucleoplasm Protein | Nucleoplasmin | Formation of nuclear matrix | 
| d. | Nuclear membrane | Ribosome | Cellulose synthesis | 
1. A
2. B
3. C
4. D
| Assertion (A): | The nucleus is the control centre of the cell and contains the genetic material (DNA). | 
| Reason (R): | The nucleus directs protein synthesis through messenger RNA (mRNA) molecules. | 
| 1. | Both (A) and (R) are True and (R) is the correct explanation of (A). | 
| 2. | Both (A) and (R) are True but (R) is not the correct explanation of (A). | 
| 3. | (A) is True but (R) is False. | 
| 4. | (A) is False but (R) is True. | 
| 1. | the enclosure has pores which membranes do not | 
| 2. | the enclosure is made up of two membranes | 
| 3. | the chemical composition is inconsistent with cellular membranes | 
| 4. | the enclosure does not enclose the nucleolus |