• Home
  • Courses
  • Online Test
  • Contact
    Have any question?
    +91-8287971571
    contact@dronstudy.com
    Login
    DronStudy
    • Home
    • Courses
    • Online Test
    • Contact

      Class 8 Science

      • Home
      • All courses
      • Class 08
      • Class 8 Science
      CoursesClass 08ScienceClass 8 Science
      • Cell- Structure and Function
        6
        • Lecture1.1
          Introduction, Discovery, Cell Theory, Cell Variation, Cell Structure-Cell Wall 31 min
        • Lecture1.2
          Cell Structure and Function -Cell Membrane, Cytoplasm, Nucleus 31 min
        • Lecture1.3
          Cell Structure and Function -Ribosomes, ER, Golgi Bodies, Lysosomes, Mitochondria 38 min
        • Lecture1.4
          Cell Structure and Function – Plastids, Vacuole, Types of Cell 20 min
        • Lecture1.5
          Chapter Notes – Cell
        • Lecture1.6
          NCERT Solutions – Cell
      • Light
        6
        • Lecture2.1
          Plane Mirror, Laws of Reflection 01 hour
        • Lecture2.2
          Multiple Reflection,Dispersion 41 min
        • Lecture2.3
          Human Eye 59 min
        • Lecture2.4
          Light Introduction 10 min
        • Lecture2.5
          Chapter Notes – Light
        • Lecture2.6
          NCERT Solutions -Light
      • Synthetic Fibers an Plastics
        3
        • Lecture3.1
          Introduction, Natural Fiber, Synthetic Fibers, Plastics and its Uses, Biodegradable & non-biodegradable wastes, Effect of Plastics on Environment 45 min
        • Lecture3.2
          Chapter Notes – Synthetic Fibers an Plastics
        • Lecture3.3
          NCERT Solutions – Synthetic Fibers an Plastics
      • Coal and Petroleum
        4
        • Lecture4.1
          Introduction, Natural Resources, Fuel-Coal 16 min
        • Lecture4.2
          Fuel-Petroleum, Natural Gas 18 min
        • Lecture4.3
          Chapter Notes – Coal and Petroleum
        • Lecture4.4
          NCERT Solutions – Coal and Petroleum
      • Stars and The Solar System
        6
        • Lecture5.1
          Celestial Objects or Heavenly Bodies 27 min
        • Lecture5.2
          Stars, Constellations 23 min
        • Lecture5.3
          Solar System 35 min
        • Lecture5.4
          Asteroids, Comets and Satellites 31 min
        • Lecture5.5
          Chapter Notes – Stars and The Solar System
        • Lecture5.6
          NCERT Solutions – Stars and The Solar System
      • Pollution of Air and Water
        5
        • Lecture6.1
          Air Pollution 21 min
        • Lecture6.2
          Greenhouse 50 min
        • Lecture6.3
          Water Pollution 30 min
        • Lecture6.4
          Chapter Notes – Pollution of Air and Water
        • Lecture6.5
          NCERT Solutions – Pollution of Air and Water
      • Force and Pressure
        4
        • Lecture7.1
          Force 12 min
        • Lecture7.2
          Pressure 45 min
        • Lecture7.3
          Chapter Notes – Force and Pressure
        • Lecture7.4
          NCERT Solutions – Force and Pressure
      • Friction
        3
        • Lecture8.1
          Introduction 25 min
        • Lecture8.2
          Chapter Notes – Friction
        • Lecture8.3
          NCERT Solutions – Friction
      • Sound
        4
        • Lecture9.1
          Introduction, Production & Propagation and Medium 41 min
        • Lecture9.2
          Reflection Of Sound 16 min
        • Lecture9.3
          Chapter Notes – Sound
        • Lecture9.4
          NCERT Solutions – Sound
      • Materials: Metals and Non-Metals
        4
        • Lecture10.1
          Physical Properties of metals and non-metals-1 25 min
        • Lecture10.2
          Physical Properties of metals and non-metals-2 06 min
        • Lecture10.3
          Chapter Notes – Materials: Metals and Non-Metals
        • Lecture10.4
          NCERT Solutions – Materials: Metals and Non-Metals

        NCERT Solutions – Cell

        Q.1 Indicate whether the following statements are True (T) or False (F).
        (a) Unicellular organisms have one-celled body.                                         (T/F)
        (b) Muscle cells are branched.                                                                     (T/F)
        (c) The basic living unit of an organism is an organ.                                  (T/F)
        (d) Amoeba has irregular shape.                                                                  (T/F)
        Sol. (a) Unicellular organisms have one-celled body.                                 (True)
        (b) Muscle cells are branched.                                                                     (False)
        (c) The basic living unit of an organism is an organ.                                   (False)
        (d) Amoeba has irregular shape.                                                                  (True)

        Q.2 Make a sketch of the human nerve cell. What function do nerve cells perform?
        Sol. The function of nerve cells is to receive and transfer messages, thereby helping to control and coordinate the working of different parts of the body.
        Q.3
         Write short notes on the following:
        (a) Cytoplasm
        (b) Nucleus of a cell
        Sol. (a) Cytoplasm:
        Cytoplasm is the jelly-like substance present between the cell membrane and the nucleus. Various other components or organelles like mitochondria, golgi bodies, ribosomes, etc. are present in the cytoplasm. Cytoplasm helps exchange and storage of substances among cell organelles. Most of the metabolic activities occur inside cytoplasm.(b) Nucleus of a cell:
        Nucleus is an important component of the living cell. It is mostly spherical and located in the centre of the cell. It is separated from the cytoplasm by a membrane called the nuclear membrane. In addition, nucleus contains thread-like structures called chromosomes. These carry genes and help in inheritance or transfer of characters from the parents to the offspring. Nucleus, in addition to its role in inheritance, acts as control centre of the activities of the cell. The entire content of a living cell is known as protoplasm. It includes the cytoplasm and the nucleus. Protoplasm is called the living substance of the cell.

        Q.4 Which part of the cell contains organelles?
        Sol. Cytoplasm is the part of cell which contains organelles such as mitochondria, ribosomes, golgi bodies, etc.

        Q.5 Make sketches of animal and plant cells. State three differences between them.
        Sol. The differences between plant cell and animal cell are:

        Parameter Plant Cell Animal Cell
        Sketch   

         

        Cell wall Present Absent
        Size Small Large
        Vacuole Large Small or Absent
        Plastids Present Absent

        Q.6 State the difference between eukaryotes and prokaryotes.
        Sol. The differences between eukaryotes and prokaryotes are:

        Eukaryotes Prokaryotes
        The cells having a well-organized nucleus with a nuclear membrane are termed as eukaryotic cells The cells having nuclear material without nuclear membrane are termed as prokaryotic cells.
        Most eukaryotes are multi-cellular. Most prokaryotes are unicellular.
        Cell organelles such as mitochondria, plastids, golgi bodies, etc. are present. Cell organelles such as mitochondria, plastids, golgi bodies, etc. are absent.
        Example: Fungi, onion cells, etc. Example: Bacteria and blue green algae

        Q.7 Where are chromosomes found in a cell? State their function.
        Sol. Chromosomes which are thread-like structures are found in the nucleus of the cell. They carry genes that help in inheritance or transfer of characters from the parents to the offspring.

        Q.8 ‘Cells are the basic structural units of living organisms’. Explain
        Sol. A cell is the smallest unit of life and is capable of all living functions. All basic functions for the organism survival take place inside cells. They are the building blocks of life. This is the reason why ‘Cells are the basic structural units of living organisms’.

        Q.9 Explain why chloroplasts are found only in plant cells?
        Sol. Chloroplasts are found in plant cells only because chloroplasts contain chlorophyll which is essential for photosynthesis. Chlorophyll traps solar energy and utilize it to manufacture food for plants.

        Q.10 Complete the crossword with the help of clues given below:
        Across:
        1. This is necessary for photosynthesis.
        3. Term for component present in the cytoplasm.
        6. The living substance in the cell.
        8. Units of inheritance present on the chromosomes.
        Down:
        1. Green plastids.
        2. Formed by collection of tissues.
        4. It separates the contents of the cell from the surrounding medium.
        5. Empty structure in the cytoplasm.
        7. A group of cells.Sol. Across:
        1. Chlorophyll
        3. Organelle
        6. Protoplasm
        8. Genes
        Down:
        1. Chloroplasts
        2. Organ
        4. Membrane
        5. Vacuole
        7. Tissue

        Prev Chapter Notes – Cell
        Next Plane Mirror, Laws of Reflection

        Leave A Reply Cancel reply

        Your email address will not be published. Required fields are marked *

        All Courses

        • Backend
        • Chemistry
        • Chemistry
        • Chemistry
        • Class 08
          • Maths
          • Science
        • Class 09
          • Maths
          • Science
          • Social Studies
        • Class 10
          • Maths
          • Science
          • Social Studies
        • Class 11
          • Chemistry
          • English
          • Maths
          • Physics
        • Class 12
          • Chemistry
          • English
          • Maths
          • Physics
        • CSS
        • English
        • English
        • Frontend
        • General
        • IT & Software
        • JEE Foundation (Class 9 & 10)
          • Chemistry
          • Physics
        • Maths
        • Maths
        • Maths
        • Maths
        • Maths
        • Photography
        • Physics
        • Physics
        • Physics
        • Programming Language
        • Science
        • Science
        • Science
        • Social Studies
        • Social Studies
        • Technology

        Latest Courses

        Class 8 Science

        Class 8 Science

        ₹8,000.00
        Class 8 Maths

        Class 8 Maths

        ₹8,000.00
        Class 9 Science

        Class 9 Science

        ₹10,000.00

        Contact Us

        +91-8287971571

        contact@dronstudy.com

        Company

        • About Us
        • Contact
        • Privacy Policy

        Links

        • Courses
        • Test Series

        Copyright © 2021 DronStudy Pvt. Ltd.

        Login with your site account

        Lost your password?

        Modal title

        Message modal