worksheet       

                                                       Cell structure and function

1. Fill Ups:

i. Cells were first observed in cork by ________________.

ii. ___________________ is the longest cell in our body.

iii. ______________ is the smallest cell known with a size of ____________ micrometer.

iv. ______________ is present in plant cell but absent in animal cell while, ___________ is present in animal cell and absent in plant cell.

v. ________________ in human blood is a single cell.

vi. A _______________ is a group of cells performing a specific function.

vii. _______________ are used to colour parts of the cell to study their details.

viii. The plastids responsible for green color of leaves is ____________________.

ix. __________ controls the transfer of a hereditary characteristic from parents to offspring.

x. _____________________ cells having nuclear material without nuclear membrane.

xi. The cells, like onion cells and cheek cells are example of __________________cells.

xii. ___________________ is a structure that contains more than one type of tissues.

xiii. The porous membrane that allows the movement of materials between the cytoplasm and the inside of the nucleus is ________________________________.

MICROORGANISMS: FRIEND AND FOE

Q1. Answer the following:

i. Microbes that reproduce only inside the hostii.

ii.A viral disease

iii.An example of a fungi.

iv.Single celled microbes

v.Microorganism that increases soil fertility

vi.Microbes that could be present in form of colonies

vii.Bacteria which causes anthrax disease.

viii.Any one preservative.

ix.A plant that can show root nodule formation –

x. A useful Fungi

xi.A disease that has been eradicated from most parts of the world –

xii. A bacterial disease in plants-

Q2. Tick the correct option:

1. Microbe involved in curd formation:

   i) Amoeba ii) Lactobacillus iii) Rhizobium iv) Bread Mould

2. Which of the following is not a fungi:

  i) Bread Mould ii) Penicillium iii) Aspergillus iv) Spirogyra

3. The carrier of malarial parasite:

  i) Anopheles ii) Aedes iii) Housefly iv) Virus

4. Rust of wheat is caused by:

  i) Bacteria ii) Virus iii) Fungi iv) Protozoa

5. Which of the following can result in spread of microbes:

  i) Air ii) Water iii) Food iv) All of these

6. The term vaccine was introduced by which scientist?

  i) Edward Jenner ii) Robert Hooke iii) Alexander Flemming iv) Robert Koch

7. Chlorophyll is present in which of the following organisms

  i) Bacteria ii) Virus iii) Algae iv) Protozoa

8. Yeast is used in the production of:

  i) Hydrochloric acid ii) Alcohol iii) Sugar iv) Oxygen

9. Which of the following does not contribute to nitrogen availability in the soil?

  i) Decay of organic matter ii) Lightning iii) Rhizobium iv) Lactobacillus

Q3. Give the contributions of the following:

  A. Louis Pasteur

  B. Alexander Fleming

  C. Robert Koch

METALS AND NON METALS

Name the following questions:-

1. Name some common non-metals used in our daily life.

2. Hardest naturally occurring substance.

3. Property of metals which make them useful as electric wires.

4. Non – metal which has metallic luster.

5. Two non metals which are soft solids.

6. Non metals do not conduct electricity or heat except for one . Name it.

7. An allotrope of carbon which is as tensile as steel.

8. Metals that are not attacked by cold water, boiling water or stream.

9. The property of metals by virtue of which these can beaten into sheets.

10.Non metals used in disinfection of drinking water.

II. Answer the following( in one or two words)

1. What are the elements called which can neither fit with metals nor non metals?

2. Which of the following metals is the best conductor of heat and electricity?

   Gold, Silver, Copper, Aluminum

3. Which property of metals makes them useful as ringing bells?

4. Arrange the following elements in order of increasing reactivity. Sodium, Magnesium, Copper, Zinc, Aluminum

5. An oxide solution of which of the following elements will turn blue litmus red.

6. Which non-metal is used in making pencil lead?

7. Identify the most reactive and least reactive metal amongst the following Aluminum, Potassium, Copper, zinc, Gold

8. State the nature of oxides of non-metals.

9. Give an example of neutral oxide .

10.Which non metal is kept under water and why?