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Subject:

science-biology

Class:

class VIII

Key Concepts

cell, cell membrane, cell wall, chloroplast, chromosome, cytoplasm, prokaryotic, eukaryotic, protoplasm, cytoplasm, plastids, mitochondria, vacuole, lysomes, nucleus, nuclear membrane, organ, organelles, plastid, pseudopodia, tissue

essential questions

1. What defines cell shape and size?
2. What enables eukaryotes to perform more specialized functions that prokaryotes do?
3. What does the cytoskeleton do?
4. What makes cells and organisms different?
5. How are cells organized in a complex multicellular organism?
6. What makes an organism truly multicellular?

Remembering:

  1. Which one of the following is not included in the nucleus: a) endoplasmic reticulum  b) DNA  c) Gene  d) Chromosome  e) None of these
  2. The liquid in the nucleus is: a) nuclear membrane  b) Nucleoplasm  c) nucleolus  d) chromosome  e) none of these
  3. Which one of the following is related to the inheritance od characters from one generation to another: a) cell membrane and cytoplasm  b) nucleolus and mitochondria  c) chloroplast and cell membrane  d) chromosomes and genes  e) none of these
  4. Which one of the following is present in animal, plant and bacterial cell: a) chloroplast  b) cell wall c) nucleus  d) cell membrane  d) none of these
  5. Which of the following statement is correct: a) Unicellular organisms do not reproduce   b) In unicellular organisms tissues work in coordination to perform different function  c) unicellular organisms respire and reproduce  d) unicellular organisms do not require food  e) none of these
  6. Entamoeba and Giardia are: a) multicellular, prokaryotic protozoan  b) unicellular, eukaryotic protozoan  c) unicellular, prokaryotic protozoan   d) multicellular, eukaryotic amoeba
  7. Which of the following is type of plastid: a) chloroplasts   b) chromoplasts  c) Leucoplasts  d) all of the above
  8. In eukarytes genes are located in____ of the cell: a) cytoplasm  b) nucleus  c) vaculoes  d) chlorophyll
  9. Protoplasm inside the nucleus is called: a) cytoplasm  b) elaioplast   c) nucleoplast  d) amyloplast
  10. An organelle, spherical in structure contains the genetic material is: a) mitochondria  b) cell wall c) ribosome  d) nucleus
  11. ___ is the power house of the cell. a) ribosome  b) mitochondria  c) nucleus  d) cell wall
  12. What is a nucleus?
  13. Which part of the cell contains organelles?
  14. Define Protoplasm
  15. What are genes?
  16. Define plastids
  17. Write a short note on: a) cytoplasm   b) nucleus of a cell
  18. Fill in the blanks:

a) ______ is membrane bound sac filled with fluid.

b)_____ is found in cytoplasm and on endoplasmic reticulums

c)_______ is involved in the formation of lysomes and peroxisome

d) _____ is capable of digesting any microorganism that enters the cell.

19. Match the column I with match column II

Column I                                       Column II

a) Ribosomes                               jelly like substance

b) Lysosomes                              powerhouse of the cell

c) Endoplasmic reticulum      Site of protein synthesis

d) Cytoplasm                             transporting tubules

e) Mitochondria                         Suicide bags

 

 

understanding:

  1. Which one of the following represent parts of an animal cell: a) chloroplast, cell wall, vacuole, cell membrane, nucleus   b) cell membrane, nucleus, vacuole, mitochondria, cell wall  c) cell membrane, nucleus, vacuole, mitochondria, ribosome  d) cell wall, chloroplast, mitochondria, cell membrane, nucleus
  2. Which one of the following represents the correct level of organization ranging from simplest to most complex: a) cells→ tissues→ organs → organ system → organisms   b) tissues → organs →cells → organisms → organ system  c) cells→ tissues→ organ system → organisms → organs  d) cells→ organs → tissues → organ systems → organisms
  3. The nucleus and the cytoplasm together are known as: a) nucleoplasm  b) cytoplasm  c) protoplasm  d) chloroplast
  4. Main distinguishing feature between plant cell and animal cell is: a) cell membrane   b) plastids  c) cell wall  d) both b and c
  5. What is the major difference between human skin cell and a human egg cell?
  6. Make a detailed sketch of the human nerve cell. Write in detail the functions of a nerve cell?
  7. What is the difference between human cheek cell and onion peel cell. Show it with a diagram
  8. Draw a well labeled diagram of plant and animal cell
  9. Write the difference between :    a) Multicellular and Unicelluar organism  b) Amoeba and WBC  c) Organ and cell  d) Plant and animal cell  e) Plastids & Vacuoles  f) Chromoplast and Chloroplast  g) cell and tissue  h) Prokaryotes and eukaryotes
  10. Write true or false against each statement: a) Robert Brown discovered nucleus in the cells   b) The plasma membrane is made up of a double layer of lipid molecules and protein molecules  c) Chloroplast helps in osmo-regulations and maintains the osmotic pressure in a cell.  d) Carbohydrates and fats are completely oxidised with the help of enzymes present in the mitochondria.

Application:

  1. The cell membrane controls the movement of substances: a) into the cells only  b) out of the cells only c) both into and out of the cells  d) in no direction
  2. Different colors of flowers in plants is due to the presence of: a) cell membrane  b) cell wall  c) plastid  d) mitochondria
  3. The liquid containing dissolved sugars and salts in the plant vacuole is: a) xylem  b) phloem  c) cell sap  d) all of the above
  4. Sheena accidentally touched a hot iron plate and immediately withdrew she hand. She reacted in sensing the heat due to: a) liver cells  b) skin cells   c) nerve cells  d) spindle like muscle cells
  5. Why are cells called the basic structure of living unit? Explain in detail.
  6. Why is nucleus considered the most important component of a living cell? How would life form be if nucleus was not well defined in cells?
  7. How does formation of pseudopodia help unicellular organisms?

Analysis:

  1. Choose the correct option about the cells: i) They have membrane bound organelles including a nucleus  ii) bacteria are examples of prokaryotic cells  iii) Lysosomes are present in eukaryotic cells   iv) fungi are prokaryotic cells  a) i and ii    b) ii, iii and iv   c) ii and iii  d) iii and iv    e) none of these
  2. A nerve cell is long and has projections so that they can: i) bring about the movement in body parts  ii) make contacts with many other nerve cells   iii) carry water and minerals salts from roots to leaves   iv) carry messages over long distances ie between brain and other parts of the body Choose the correct option: a) i and ii   b) ii and iii  c)  ii and iv   d) iii and iv
  3. Small rod like organelles which oxidize food to produce energy are: a) golgi body  b)  mitochondria  c) lysomes  d) endoplasmic reticulum
  4. Statement 1: Bacteria are unicellular organism and have no nuclear membrane present in them. Statement 2: Amoeba is a unicellular organism so its a prokaryote  a) Both statement 1 and 2 are correct and Statement 2 is the correct conclusion from statement 1  b) Both statement 1 and 2 are correct but Statement 2 is not the correct conclusion from statement1  c) Statement 1 is correct but statement 2 is false  d) Statement 1 is false but statement 2 is correct
  5. Statement 1: Cell shape and size define the structure and function of cell. Statement 2: Nerve cells are branched and spindle in shape therefore they are able to send and receive messages.  a) Both statement 1 and 2 are correct and Statement 2 is the correct conclusion from statement 1  b) Both statement 1 and 2 are correct but Statement 2 is not the correct conclusion from statement1  c) Statement 1 is correct but statement 2 is false  d) Statement 1 is false but statement 2 is correct
  6. Statement1: Cell membrane provide shape to the cells  Statement 2: All plants and animal cells have only cell membrane to give them the structure  a) Both statement 1 and 2 are correct and Statement 2 is the correct conclusion from statement 1  b) Both statement 1 and 2 are correct but Statement 2 is not the correct conclusion from statement1  c) Statement 1 is correct but statement 2 is false  d) Statement 1 is false but statement 2 is correct
  7. Statement1: Bacterial cells have cell wall   Statement 2: Plant cells have cell membrane which gives shape and rigidity to the cells  a) Both statement 1 and 2 are correct and Statement 2 is the correct conclusion from statement 1  b) Both statement 1 and 2 are correct but Statement 2 is not the correct conclusion from statement1  c) Statement 1 is correct but statement 2 is false  d) Statement 1 is false but statement 2 is correct
  8. Statement 1: Plastids are colored bodies in cytoplasm of plant cells. Statement 2: Plastids contain green pigment called chloroplasts : a) Both statement 1 and 2 are correct and Statement 2 is the correct conclusion from statement 1  b) Both statement 1 and 2 are correct but Statement 2 is not the correct conclusion from statement1  c) Statement 1 is correct but statement 2 is false  d) Statement 1 is false but statement 2 is correct
  9. Statement 1: WBC in human blood does not have fixed shape  Statement 2: Amoeba and WBC both have non fixed shape but amoeba is an organism and WBC is just a cell.  a) Both statement 1 and 2 are correct and Statement 2 is the correct conclusion from statement 1  b) Both statement 1 and 2 are correct but Statement 2 is not the correct conclusion from statement1  c) Statement 1 is correct but statement 2 is false  d) Statement 1 is false but statement 2 is correct
  10. The table given below has certain terms and five spaces named A, B, C, D and E.

    Cell                                    Feature/ part                  Function

    Bacteria                               A chloroplast                    Movement B D protect the cells from its surroundings

    Plant cell  C, E                   Spindle shaped

    Selectively permeable

    From the options given below choose the correct combination of terms:

    a) A- pseudopodia , B- respiration  C- muscle cell   D- expansion    E- nucleus

    b) A- flagella, B- Photosynthesis    C- nerve cell   D- contraction   E- cell vacuole

    c) A- cilia    B- reproduction  C- blood cell   D- contraction   E- nucleus

    d) A- flagella   B- photosynthesis   C- muscle cell  D- contraction  E- cell membrane

    e) None of these

  11. Do you think big animals have larger cells? Give reasons to prove your point.
  12. Is hen’s egg a cell or a group of cells? Give reasons for your answer.
  13. Amoeba does not have a constant shape. How does it help amoeba in surviving?

Evaluation:

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