Important Questions Class 11 Biology Chapter 8 Cell: The Unit of Life for CBSE

Important Questions for Class 11 Biology 8th Chapter Cell: The Unit of Life MCQ, Very Short, Short Type, Long Type

CBSE Class 11 Important Questions for Class 11 Biology Chapter 8 Cell: The Unit of Life all MCQ Type, Very Short Type, Assertion Reason Type, Case Study, Short Type and Long Type Questions with Answers by Expert. Important Questions for Section A, B, C, D Class 11 Biology Chapter 8.

  • MCQs

(1) Assertion: Most prokaryotic cell particularly the bacterial cells have a chemically complex cell envelope

Reason: The cell envelope consists of a tightly bound three layered structures, each layer of the envelope performs distinct function

(a) If both Assertion and Reason are true and Reason is the correct explanation of Assertion.

(b) If both Assertion and Reason are true but Reason is not the correct explanation of Assertion.

(c) If Assertion is true but Reason is false.

(d) If both Assertion and Reason are false.

(2) Assertion: Prokaryotes have membrane bound organelles.

Reason: Double layer membrane is present in all the organelles.

(a) If both Assertion and Reason are true and Reason is the correct explanation of Assertion.

(b) If both Assertion and Reason are true but Reason is not the correct explanation of Assertion.

(c) If Assertion is true but Reason is false.

(d) If both Assertion and Reason are false.

(3) All prokaryotes have a cell wall surrounding the cell membrane except in

(a) Mycoplasma

(b) Bacillus

(c) Vibrio

(d) Blue green algae

(4) Hydrolytic digestive enzymes are present in__________

(a) Mitochondria

(b) Lysosomes

(c) Nucleus

(d) Endoplasmic retilicum

(5) _______ are only present in animals.

(a) Nucleus

(b) Cell wall

(c) Centrioles

(d) Chloroplast

(6) Assertion: Antibiotic resistance is one such trait that aids in survival.

Reason: Such bacteria have distinct phenotypic characteristics due to the plasmid DNA.

(a) If both Assertion and Reason are true and Reason is the correct explanation of Assertion.

(b) If both Assertion and Reason are true but Reason is not the correct explanation of Assertion.

(c) If Assertion is true but Reason is false.

(d) If both Assertion and Reason are false

(7) Assertion: Ribosomes are non-membrane bound organelles

Reason: Ribosomes are found only in eukaryotic cells

(a) If both Assertion and Reason are true and Reason is the correct explanation of Assertion.

(b) If both Assertion and Reason are true but Reason is not the correct explanation of Assertion.

(c) If Assertion is true but Reason is false.

(d) If both Assertion and Reason are false

(8) Mesosomes are formed from

(a) Cell membrane

(b) Vacuoles

(c) Golgi apparatus

(d) Mitochondria

(9) Mitochondria is site for

(a) ATP production

(b) ETS

(c) Kreb cycle

(d) All the above

10) In __________ centromere is situated close to its end forming one extremely short and one very long arm

(a) Metacentric

(b) Acrocentric

(c) Sub- metacentric

(d) Telocentric

11.) Assertion: The eukaryotic ribosomes are 80S while the prokaryotic ribosomes are 70S.

Reason: Here ‘S’ stands for the sedimentation coefficient which is indirectly a measure of density and size.

(a) If both Assertion and Reason are true and Reason is the correct explanation of Assertion.

(b) If both Assertion and Reason are true but Reason is not the correct explanation of Assertion.

(c) If Assertion is true but Reason is false.

(d) If both Assertion and Reason are false.

12.) When the centromere is in the middle part of chromosome, it is called

a.) Metacentric

b.)Acrocentric

c.) Sub- metacentric

d.) Telocentric

13.) Contractile vacuoles can be seen in

a.) amoeba

b.) yeast

c.) viruses

d.) all the above

  • Answer in one line

Q.1) What are organelles?

Ans. Eukaryotic cells have several membrane-bound distinct structures termed organelles in addition to the nucleus. Endoplasmic reticulum (ER), Golgi complex, lysosomes, mitochondria, microbodies, and vacuoles are among examples.

Q.2) Give 2 examples of non-membrane bound organelles present in animals?

Ans. 2 examples of non-membrane bound organelles present in animals are ribosomes and centrosome

Q.3) State the difference between contractile vacuoles and food vacuoles in Amoeba.

Ans. The contractile vacuole is crucial for osmoregulation and excretion in Amoeba. Food vacuoles are generated by engulfing food particles in various organisms, including protists.

Q.4) What are the components of cytoskeleton?

Ans. The cytoskeleton is an intricate network of filamentous proteinaceous structures found in the cytoplasm that includes microtubules, microfilaments, and intermediate filaments.

Q.5) What is satellite DNA?

Ans. Few chromosomes have non-staining secondary constrictions in the same place. This creates the appearance of a small component known as the satellite.

Q.6) Define: Microbodies

Ans. In both plant and animal cells, there are many membrane-bound minute vesicles termed microbodies that contain diverse enzymes.

Q.7) Give examples of inclusion bodies found in prokaryotes.

Ans. Phosphate granules, cyanophycean granules, glycogen granules and Gas vacuoles are examples of inclusion bodies found in prokaryotes.

Q.8) State the functions of cytoskeleton?

Ans. The cytoskeleton in a cell performs a variety of roles, including mechanical support, movement, and cell shape maintenance.

  • Answer in short

Q.1) How are bacteria classified?

Ans. 1.) Bacteria are divided into two types based on differences in cell envelopes and how they respond to Gram’s staining method.

2.) Those that take up the gram stain are Gram positive bacteria, while those that do not are Gram negative bacteria.

Q.2) State the postulates of cell theory.

Ans. Cell theory is that

(i) All living entities are made up of cells and their products.

(ii) All cells develop from pre-existing ones.

Q.3) What are the different types of endoplasmic reticulum?

Ans. 1.) Ribosomes are frequently seen connected to the ER’s outer surface.

2) Rough endoplasmic reticulum is an endoplasmic reticulum with ribosomes on its surface (RER).

3) They appear smooth in the absence of ribosomes and are known as smooth endoplasmic reticulum (SER).

Q.4) Briefly explain the structure and location of the chromatin.

Ans. 1.) The interphase nucleus contains chromatin, a loose and unclear network of nucleoprotein fibers.

2) However, during certain stages of cell division, cells exhibit organized chromosomes in place of the nucleus.

3) Chromatin is made up of DNA, basic proteins known as histones, non-histone proteins, and RNA.

Q.5) What is flagella? Explain the structure of flagella.

Ans.) 1.) Bacteria that are motile have flagella, which are thin filamentous extensions of their cell wall.

2) Bacteria differ in the number and configuration of their flagella.

3) The bacterial flagellum is made up of three parts: a filament, a hook, and a basal body.

4) The filament is the longest segment, extending from the cell surface to the outside.

Q.6) Differentiate between peripheral and integral membrane proteins.

Ans. 1.) Membrane proteins are divided as integral or peripheral proteins based on their ease of extraction.

2.) Peripheral proteins are found on the membrane’s surface.

3.) Integral proteins are partially or completely buried within the membrane.

  • Answer in brief

Q.1) Describe the types of plastids in plants?

Ans. 1.) Plastids are categorized into three types based on their pigments: chloroplasts, chromoplasts, and leucoplasts.

2.) Chlorophyll and carotenoid pigments are found in chloroplasts, and they are important for capturing light energy required for photosynthesis.

3.) Carotene, xanthophylls, and other fat-soluble carotenoid pigments are found in the chromoplasts which give plants color.

4.) The plant’s portion turns yellow, orange, or red as a result of this.

5.) Colorless plastids of various forms and sizes with stored nutrients are known as leucoplasts: Amyloplasts store carbohydrates (starch), such in potatoes, whereas elaioplasts store oils and fats, and aleuroplasts store proteins.

Q.2) Give the functions of RER, SER, Golgi apparatus.

Ans. 1.) RER is typically seen in cells that are actively involved in protein synthesis and secretion.

2.) They are widespread and connect to the nucleus’s outer membrane.

3.) The smooth endoplasmic reticulum is the primary location of lipid synthesis.

4.) In animal cells, SER synthesizes lipid-like steroidal hormones.

5.) The Golgi apparatus is primarily responsible for packing items for delivery to intracellular targets or secretion outside the cell.

6.) The Golgi apparatus is a crucial region for the synthesis of glycoproteins and glycolipids.

Q.3) describe the internal structure of flagellum

Ans. 1.) The plasma membrane is protected by cilia or flagellum.

2.) The center, known as the axoneme, has a number of microtubules that run parallel to the long axis.

3.) The axoneme is typically composed of nine doublets of radially oriented peripheral microtubules and a pair of centrally positioned microtubules.

4.) The 9+2 array refers to such an arrangement of axonemal microtubules.

5.) The central tubules are linked by bridges and are surrounded by a central sheath, which is linked to one of the tubules of each peripheral doublet by a radial spoke.

6.) As a result, there are nine radial spokes. Linkers connect the peripheral doublets as well.

7.) The cilium and flagellum both emerge from basal bodies, which are centriole-like structures.

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