CBSE Class 9 Biology Fundamental Unit Of Life Worksheet Set B

Read and download free pdf of CBSE Class 9 Biology 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

Fundamental Unit Of Life Class 9 Biology Worksheet Pdf

Class 9 Biology students should refer to the following printable worksheet in Pdf for 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 Fundamental Unit Of Life

 

CBSE Class 9 Biology Worksheet - Fundamental Unit of Life - Practice worksheets for CBSE students. Prepared by teachers of the best CBSE schools in India.

Assignments for First Term Class –IX

Biology ASSIGNMENT 1

Fundamental unit of life

Q1 Write the main function of leucoplast.

Q2 What is the function of SER in liver cells of vertebrates?

Q3 Why the RER appears rough?

Q4 Why viruses are not supposed to be living?

Q5 What is a nucleoid?

Q6 Why dry raisins placed in water swell up?

Q7 In which part of a plant chromoplasts are found?

Q8 Where are genes located?

Q9 What will happen if we keep a plant cell or animal cell in a i) Hypotonic solution ii) Hypertonic solution iii) Isotonic solution.

Q10 Explain the importance of osmosis for living beings?

Q11 Give the historical development of cell theory.

Q12 Who coined the term “cell “ and how?

Q13 Write the contribution of (a) Robert Hooke, (b) Leeuwenhoek (c) Robert Brown

Q14 Draw a large diagram of an animal cell as seen through aan electron microscope. Label the parts that carry on the function of Respiration, secretion, protein synthesis, transport of material.

Q15 Which substance is responsible for transfer of characters from one generation to another?

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

Question. Name the cleaning organelle in the cell.
Ans : Lysosomes.

Question. What is the full form of DNA?
Ans : DNA (Deoxyribose Nucleic Acid).

Question. Name the cell organelle which helps in the formation of lysosome.
Ans : Golgi apparatus.

Question. Why are plasma membrane called selectively permeable membrane?
Ans : Plasma membrane allows to go in and out some materials to and from the cell. It also prevents movement of some other materials. So, it is called selectively permeable membrane.

Question. What are ribosomes? Where are ribosomes located in the cell? What is their function?
Ans : Ribosomes are spherical organelles present in the cell which are either freely distributed in the cytoplasm or may be attached to the endoplasmic reticulum. It has ribosomal RNA (Ribonucleic acid) and proteins. It helps in protein synthesis.

Question. What is a eukaryotic cell?
Ans : Eukaryotic cells are much larger and more complex than prokaryotic cells. Their complexity is reflected in their DNA content. These cells contain a membrane bound nucleus containing nucleolus. A eukaryotic cell contains many membrane bound cell organelles like the mitochondria, the endoplasmic reticulum and the Golgi bodies. These cells have more than one chromosome and the cell division is by meiotic mode.

Question. Explain the structure and function of Golgi bodies.
Ans : Structures : Golgi bodies consist of a system of membrane-bound vesicles arranged in stacks parallel to each other called cisterns. These membranes have connections with the membrane of endoplasmic reticulum (ER).
Functions :
(i) The material synthesized near the ER is packaged and dispatched to various targets inside and outside the cell through Golgi apparatus.
(ii) It also stores, modifies and helps in the packaging of products in vesicles.
(iii) In some cases, complex sugars may be made from simple sugars in it.
(iv) It also helps in the formation of lysosomes.

Question. What are the types of cell on the basis of type oforganization? 
Ans : (i) Prokaryotic cells : Cells which have less developed nucleus and without nuclear membrane and nucleolus. These are primitive and incomplete cells. E.g. bacteria.
(ii) Eukaryotic cells : Cells which have well developednucleus with nuclear membrane and nucleolus. E.g. plants and animals.

Question. What is lacking in a virus which makes it dependant on a living cell to multiply?
Ans : Viruses look selectively permeable process membrane and cell organelles. Thus, they lack a basic structural organization to perform various life processes effectively and in their own way. After entering in a living cell, a virus utilizes its own genetic material and machinery of host cell to multiply.

Question. What would happen if when we put an animal cell into a solution of sugar or salt in water?
Ans : The following three things could happen : (i) If the solution surrounding the cell is very dilute than cytoplasm, the water will move into the cell, i.e., the cell will gain water.
(ii) If the solution has exactly similar water concentration as that of cytoplasm of cell, there will be no net movement of water across the cell membrane, i.e., no gain or loss of water from the cell.
(iii) If the medium (solution) has a lower concentration of water than the cell, i.e., the solution is concentrated, the cell will lose water by osmosis. How do all cells look alike in terms of shape and size?
Ans : Cells vary in shapes and sizes according to the fusion. Generally, cells are spherical but they may be long and branched as in nerve cell, Kidney shaped as guard cell in plant’s leaves, discoid as RBC, spindle shaped as muscle cell, etc. Size of cell varies from 0.2 mm to 18 cm in diameter. Some are microscopic while some are visible with naked eyes.
For example :
(i) Size of a typical cell in a multicellular organism ranges from 20-30 mn.
(ii) The largest cell is ostrich egg (15 cm in diameter with shell and 8 cm in diameter without shell).
(iii) The longest cell is nerve cell (up to 1 m. or more) and red blood cells are the smallest cell in our body.
(iv) Smallest cells so far known are PPLOs, e.g. mycoplasma (0.1 mm in diameter).

Students must free download and practice these worksheets to gain more marks in exams. CBSE Class 9 Biology Worksheet - Fundamental Unit of Life

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