Cell: The Unit of Life Assertion Reason Based Questions

The following questions consist of two statements, one labelled as Assertion (A) and the other labelled the Reason ®. Examine these two statements carefully and select the most appropriate answer codes.
A. Assertion and reason both are correct and reason is the correct explanation of Assertion.
B. Assertion and reason both are correct and reason is not the correct explanation of Assertion.
C. Assertion is correct but reason is wrong.
D. Both Assertion and Reason are false.

1. Assertion: Secondary wall is capable of growth.
   Reason: Secondary Wall is formed on the inner side of the cell.
2. Assertion: Polytene chromosomes have a high amount of DNA.
   Reason: Polytene chromosomes are formed by repeated replication of chromosomal DNA without separation of chromatids.
3. Assertion: Proteins are modified in the cisternae of the Golgi bodies.
   Reason: Modified proteins are released from the Cis- face of the Golgi bodies.
4. Assertion: A cell membrane show fluid behaviour.
   Reason: A membrane is a mosaic or compositr of diverse lipids and proteins.
5. Assertion: SER is the major site for synthesis of proteins.
   Reason: Lipids like steroidal hormones are synthesized in SER.
6. Assertion: Eukaryotic cells have the ability to adopt a variety of shapes and carry out directed movements.
   Reason: There are three principal types of protein filaments- microfilaments, microtubules and intermediate filaments, which constitute the cytoskeleton.
7. Assertion: Membrane transport requires carrier proteins.
   Reason: Tansport across the cell membrane always occurs along the concentration gradient.
8. Assertion: Prokaryotic genome consists of a single circular DNA molecule.
   Reason: Genetic variations do not occur in prokaryotes.
9. Assertion: Pili are elongated tubular structure found on the surface of bacteria.
   Reason: Pili do not play a role in motility.
10. Assertion: In plant tissue culture, somatic embryos can be induced from any plant cell.
    Reason: Any viable plant cell can differentiate into somatic embryos.
11. Assertion: Cell wall is a non- living rigid structure of the cell.
    Reason: The cell wall of algae is made up of cellulose, galactans and mannans.
12. Assertion: Cell is the basic unit of life.
    Reason: All the activities of life are performed by cells.
13. Assertion: The true nucleus is generally absent in E. coli other prokaryotes.
    Reason: An undifferentiated, unorganised fibrillar nucleus without any limiting membrane is observed in prokaryotic cells.
14. Assertion: Leucoplasts are found in varied shapes and sizes with stored nutrients.
    Reason: Leucoplasts are coloured plastids.
15. Assertion: Endoplasmic reticulum ia a part of endomembrane system
    Reason: Endoplasmic reticulum divides by fission.

Answer Sheet

1. D
2. A
3. C
4. A
5. D
6. A
7. C
8. C
9. B
10. A
11. B
12. A
13. A
14. C
15. B