NCERT Exemplar solutions for Biology [English] Class 11 chapter 8 - Cell : the Unit of Life [Latest edition]

A common characteristic feature of plant sieve tube cells and most of mammalian erythrocytes is ______.

Select one which is not true for ribosome.

Which one of these is not a eukaryote?

Which of the following stains is not used for staining chromosomes?

Different cells have different sizes. Arrange the following cells in an ascending order of their size. Choose the correct option among the followings.

1. Mycoplasma
2. Ostrich eggs
3. Human RBC
4. Bacteria

Which of the following features is common to prokaryotes and many eukaryotes?

Who proposed the fluid mosaic model of plasma membrane?

Which of the following statements is true for a secretory cell?

What is a tonoplast?

Which of the following is not true of a eukaryotic cell?

Which of the following statements is not true for plasma membrane?

Plastid differs from mitochondria on the basis of one of the following features. Mark the right answer.

Which of the following is not a function of cytoskeleton in a cell?

The stain used to visualise motochondria is ______.

What is the significance of vacuole in a plant cell?

What does ‘S’ refer in a 70S and an 80S ribosome?

Mention a single membrane bound organelle which is rich in hydrolytic enzymes.

What are gas vacuoles? State their functions?

What is the function of a polysome?

What is the feature of a metacentric chromosome?

What is refer-ed to as satellite chromosome?

Discuss briefly the role of nucleolus in the cells actively involved in protein synthesis.

Explain the association of carbohydrate to the plasma membrane and its significance.

Comment on the cartwheel structure of centriole.

Briefly describe the cell theory.

Differentiate between Rough Endoplasmic Reticulum (RER) and Smooth Endoplasmic Reticulum (SER).

Give the biochemical composition of plasma membrane. How are lipid molecules arranged in the membrane?

What are plasmids? Describe their role in bacteria?

What are plasmids? Describe their role in bacteria?

What are histones? What are their functions?

What structural and functional attributes must a cell have to be called a living cell?

Briefly give the contributions of the following scientists in formulating the cell theory

1. Robert Virchow
2. Schielden and Schwann

Is extra genomic DNA present in prokaryotes and eukaryotes? If yes, indicate their location in both the types of organisms.

Structure and function are correlatable in living organisms. Can you justify this by taking plasma membrane as an example?

Eukaryotic cells have organelles which may

1. not be bound by a membrane
2. bound by a single membrane
3. bound by a double membrane

Group the various sub-cellular organelles into these three categories.

The genomic content of the nucleus is constant for a given species where as the extra chromosomal DNA is found to be variable among the members of a population. Explain.

Justify the statement, “Mitochondria are power houses of the cell”

Is there a species specific or region specific type of plastids? How does one distinguish one from the other?

Write the function of the following:

Centromere

Write the function of the following:

Cell wall

Write the function of the following:

Smooth ER

Write the function of the following:

Golgi Apparatus

Write the function of the following:

Centrioles

Are the different types of plastids interchangeable? If yes, give examples where they are getting converted from one type to another.