ICSE Selina Solutions for class10 Biology Chapter 1 - Cell- The structural and functional unit of life

Access ICSE Selina Solutions for Grade 10 Biology Chapter 1 - Cell- The structural and functional unit of life

A. Very Short Answer Questions
1. Identify the cellular structures with the help of the following clues.
(a) It synthesizes respiratory enzymes.
Ans: Mitochondria helps in synthesizing the respiratory enzymes. 
(b) It is made up of lipoprotein.
Ans: Cell membrane and the plasma membrane is made up of lipoprotein. 
(c) A non-living rigid layer surrounding the plasma membrane.
Ans: Cell wall is the layer that surrounds the plasma membrane. 
(d) Supportive framework for the cell.
Ans: Endoplasmic reticulum helps in providing the framework for the cell. 
(e) It consists of cisternae, vesicles and vacuoles.
Ans: Cisternae, vesicles and vacuoles are present in the golgi apparatus. 
(f) It destroys foreign substances.
Ans: Foreign substances are destroyed by the lysosomes. 
(g) It gives turgidity to the plant cells.
Ans: Plant cells get turgidity with the help of plant cells. 
(h) It is made up of DNA threads.
Ans: DNA threads are present in chromatin fibers. 
(i) It contains chromatin fibers.
Ans: Nucleus has chromatin fibers. 
(j) It initiates and regulates cell division.
Ans: Cell division is initiated and regulated by centrosomes.  2. Give two examples of each:
(a) Unicellular animals
Ans: (a) Unicellular animals - Amoeba, Paramoecium
(b) Unicellular plants
Ans: (b) Unicellular plants - Chlamydomonas, Diatoms
(c) Cell organelles
Ans: (c) Cell organelles - Mitochondria, Nucleus
(d) Cell inclusions
Ans: (d) Cell inclusions - Vacuoles, Granules
(e) Stains that make the nucleus distinct
Ans: (e) Stains which make the nucleus distinct - Iodine, Eosin 3. Name the following:
(a) A plastid without pigment.
Ans: The leucoplast does not contain pigments. 
(b) A pigment that is not found in plastids.
Ans: Anthocyanin is not present in plastids. 
(c) The orange-red pigment found in the chromoplast.
Ans: It is carotene. 
(d) Scattered Golgi complex, found in plant cells.
Ans: They are known as dictyosomes. 
(e) Amoeboid blood cells of the human body.
Ans: White blood cells are known as the amoeboid blood cells of the human body. 
(f) The smallest cell of the human body.
Ans: Red blood cells are the smallest cells. 
(g) Bean-shaped cells of stomata.
Ans: They are known as guard cells. 
(h) The part of cytoplasm which is devoid of the organelles.
Ans: Cytosol is the name of that part of the cytoplasm that does not have organelles. 
(i) The folds/finger-like projections from the inner wall of the mitochondria.
Ans: They are known as cristae. 
(j) The tubules of the Golgi complex.
Ans: Cisternae are the tubules of the Golgi complex.  B. Descriptive type
1. Define the following terms:
(a) Cell: Cell is the structural and functional unit of life that is capable of independent existence. It performs all the basic functions of the cells. 
(b) Organelles: Organelles are specialized structures. They are membrane-bound living structures in a cell concerned with definite functions.
(c) Cytoplasm: Cytoplasm is the part of the cell which is present inside the cell membrane and outside the nucleus.
(d) Protoplasm: The living parts of the cell which consist of cytoplasm, nucleus and other living bodies collectively constitute protoplasm or protoplast.
(e) Nucleus: Nucleus is a large spherical body lying nearly in the center of the cytoplasm. 2. Distinguish between the following pairs:
(a) Plant cell and animal cell 
Ans: 
(a) Differences between plant cell and animal cell:
(b) Cell wall and cell membrane
(b) Differences between cell wall and cell membrane:
(c) Centrosome and chromosome
(c) Differences between centrosome and chromosome:
(d) Chloroplast and chromoplast
(d) Differences between chloroplast and chromoplast:

Plant Cell	Animal Cell
1. It is usually larger in size.	1. It is usually smaller in size.
2. It consists of a definite cell wall made up of cellulose.	2. It lacks a cell wall.
3. It consists of large and prominent vacuoles.	3. It consists of small and temporary vacuoles.
4. It consists of less dense cytoplasm.	4. It consists of denser and more granular cytoplasm.

Cell Wall	Cell Membrane
1. It is the outermost covering in plant cells.	1. It is the outermost covering in animal cells.
2. It is a non-living and rigid layer.	2. It is thin, flexible and living membrane.
3. It is freely permeable.	3. It is semi-permeable.
4. It is made up of cellulose.	4. It is made up of lipoproteins.

Centrosome	Chromosome
1. It is a clear space of cytoplasm located close to the nucleus.	1. It is a highly coiled structure contained within the nucleus.
2. Usually one centrosome is present per cell.	2. Several chromosomes can be present per cell.
3. It consists of two rod-like structures made of protein tubulin.	3. It consists of DNA coiled around histone protein core.
4. It initiates and regulates cell division.	4. It transfers hereditary characters from parents to offspring.

Chloroplast	Chromoplast
1. It is green in colour.	1. It is variously coloured.
2. It contains the pigment chlorophyll.	2. It contains pigments such as xanthophyll and carotene.
3. It traps solar energy for photosynthesis.	3. It imparts colour to flowers and fruits.

More Selina Concise Solutions Class 10

Selina Concise Class 10 Physics Solutions 

Selina Concise Class 10 Maths Solutions 

Selina Concise Class 10 Chemistry Solutions 

Selina Concise Class 10 Biology Solutions 

Topics Covered in Biology Chapter 1 

• Let us have a quick look at all the topics that are included in the chapter:
• What is a cell? 
• The invention of the microscope and the discovery of cell Cell theory 
• Cells:How numerous? 
• Cells – How small? 
• The smallness of cells: A greater efficiency 
• Cell shapes – To suit the functional requirement Cell membrane and cell wall Cytoplasm. 
• The Plant and animal cells Protoplasm Prokaryotic and eukaryotic cells Every activity of a living organism is the outcome of cellular activity 

Benefits of Selina Solutions for Class 10 Biology Chapter 1

Once your school lectures are over, you need reference material to study Biology lessons for class assignments and exam preparation. With the concise ICSE Biology Class 10 solutions, you can use the model answers to successfully attempt questions covered in the Selina Biology textbook. 

These solutions provide step-wise answers for Biology chapters such as the nervous system, transpiration, the circulatory system, the reproductive system, the excretory system, and more. You can benefit immensely from Selina Concise Biology solutions for ICSE Class 10 because these are reference answers by experienced Science teachers. 

Our expert educators give you accurate answers to textbook questions according to the latest exam guidelines and syllabus of the ICSE board. In addition, the chapter solutions are free and conveniently available online for a quick revision of important MCQs, diagrams, and other types of questions.