CBSE Class 9 Biology The Fundamental Unit Of Life Worksheet Set B

Read and download free pdf of CBSE Class 9 Biology The Fundamental Unit Of Life Worksheet Set B. Students and teachers of Class 9 Biology can get free printable Worksheets for Class 9 Biology in PDF format prepared as per the latest syllabus and examination pattern in your schools. Standard 9 students should practice questions and answers given here for Biology in Grade 9 which will help them to improve your knowledge of all important chapters and its topics. Students should also download free pdf of Class 9 Biology Worksheets prepared by school teachers as per the latest NCERT, CBSE, KVS books and syllabus issued this academic year and solve important problems provided here with solutions on daily basis to get more score in school exams and tests

The Fundamental Unit Of Life Class 9 Biology Worksheet Pdf

Class 9 Biology students should refer to the following printable worksheet in Pdf for The Fundamental Unit Of Life in standard 9. This test paper with questions and answers for Grade 9 Biology will be very useful for exams and help you to score good marks

Class 9 Biology Worksheet for The Fundamental Unit Of Life

 

CBSE Class 9 Biology Worksheet - The Fundamental Unit of Life (2)

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 Exam Questions NCERT Class 9 Science Chapter 5 The Fundamental Unit of Life

Question. Explain the following terms :
(a) Plasma membrane,
(b) Cytoplasm,
(c) Nucleus.
Ans : (a) Plasma membrane : It is a thin membrane which controls the passage of materials in and out of the cell. It is also called selectively permeable membrane. It makes the outer oundary of the cell and is made up of protein.
(b) Cytoplasm : It is transparent jelly-like thick substance present in the cell. It makes the ground of the cell in which all the cell organelles are suspended.
(c) Nucleus : It is a double-layered membrane structure which contains chromosomes required for the inheritance of characteristics from one generation to the other.

Question. What is lacking in a virus which makes it dependant on a living cell to multiply?
Ans : Viruses do not have a basic structural organization to perform various life processes in their own as they look selectively permeable process membrane. After
entering in a living cell, a virus utilizes its own genetic material and machinery of host cell to multiply.

Question. Expand the term ATP. What is use of ATP?
Ans : ATP stands for Adenosine Tri-phosphate Application : ATP molecules are rich in chemical energy. The body cells use this energy for synthesis of new chemical compounds, and for mechanical work done by cells.

Question. What is the function of nucleus in a cell?
Ans : The nucleus plays a very important role in the reproduction of cells. It also helps the single cell to divide and form two new daughter cells. It also helps in an important role in determining how cell will develop.

Question. Name various cell organelles.
Ans : The cell organelles are : Endoplasmic Reticulum, Ribosomes, Golgi apparatus, Lysosomes, Mitochondria, Plastids, Vacuoles, Peroxisomes and Centrosome.

Question. (a) Name the organelle which provides turgidity and rigidity to the plant cell. Name any two substances which are present in it.
(b) How are they useful in unicellular organisms?
Ans : (a) Plant cells have big vacuoles that provide them turgidity and rigidity. Plant vacuoles store amino acids, sugars, various organic acids and some proteins.
(b) In unicellular organism they can serve the following works :
(i) Forming food vacuoles : In single celled organisms like amoeba, the food vacuole contains the food items that the amoeba has engulfed. After that the food items are digested by the enzymes.
(ii) Removal of excess water and wastes : In some unicellular organisms, vacuoles play important roles in egesting excess water and some wastes from the cell.

Question. What is membrane biogenesis?
Ans : The endoplasmic reticulum helps in the manufacture of proteins and fat molecules or lipids which are important for the cell function. These proteins and lipids helps in the building of the cell membrane. This process is known as membrane biogenesis.

Question. All cells come from pre-existing cells. Justify?
Ans : All organisms around are made up of one or more cells. There are single cells organism called unicellular like amoeba whereas some single body are made up of many cells called multicellular organism. Cells divide to produce cells of their own kind. Hence, all cells come from pre-existing cells.

Question. What are chromosomes? What are they made of?
Ans : The compact rod-like bodies inside the nucleus are called chromosomes. These are seen at the time of cell division. They are made up of deoxyribonucleic acid or DNA and proteins.

Question. What is the cell wall composed of ?
Ans : The cell wall is composed of cellulose.

Question. Name two cells with cell wall.
Ans : Onion cell (plant cell) and fungi are two cells with cell wall.

Question. Which organelle makes the digestive enzyme of lysosome?
Ans : Rough endoplasmic reticulum makes the digestive enzyme of lysosomes.

Question. Name the cell organelle which helps in the transporta tion of material.
Ans : Endoplasmic reticulum.

Question. Name the smallest cell and the longest cell in human body.
Ans : The smallest cell is the red blood cell or sperm cell in male. The longest cell is the nerve cell.

 

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