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Subject: science-biology
Class: class VII
Key Concepts
modes on nutrition, photosynthesis,structure of plant cell, symbiotic association
essential questions
1. How do we know plants make their own food? 2. Why can we as humans not make food from carbon dioxide, water and sunlight? 3. How do water and mineral absorbed by roots reach the leaves? 4. Why do leaves only make food and not any other part of the plant does not? 5. How do we come to know that leaves make food for the plant? 6. What would happen if stomata closed completely at night? 7. Why are parasitic plants called plants when they are dependent on others for foods? 8. How are nutrients replenished in soil by crop rotation?

  1. Give 2 examples  each of heterotrophs and autotrophs.
  2. Define nutrition.
  3. What are the various modes of nutrition found in plants. give example for each.
  4.  What are the various components found in a plant cell. draw a labeled diagram of a plant cell
  5.  Match the following:

  column I               column II

cholorophyll                rhizobium

nitrogen                          heterotrophs

cuscuta                             pitcher plant

animals                            leaf

insects                          parasite




  1. Name the following: a)  a parasitic plant with yellow, slender, and branched stem.b) a plant that is partially autotrophic  c) the pores through which leaves exchange gases.
  2.  Distinguish between a parasite and a saprotroph.
  3.  Give a brief description of the process of synthesis of food in green plants.
  4. Why are fungi called saprotrophs.
  5. Write the difference between saprotrphs and heterotrophs.
  6. Plants use other mode of producing food other than photosynthesis
    1. a) Parasitic Mode
    2. b) Saprophytic mode
    3. c) Insectivorous Mode

    d) All of the above

  7. Correct the following sentences by correcting the highlighted words:

    a) Green pigment present in leaves is rhizobium. Ans

    b) Root Hair provides low surface area. Ans.   __________________________________-c) Roots are the main site of photosynthesis in plants. Ans.

  8.  What is symbiotic association in plants. Give two examples.


  1. What leads a plant to become an insectivorous plant?
  2.  Why are legumes rich in protein?


  1. Why do the cells surrounding the pores of the stomata called guard cells? Show guard cells in a labelled diagram.
  2. How do we know there is chlorophyll in leaves? Explain with an experiment.
  3. How do you think leaves are able to synthesis proteins and vitamins? Explain the process in detail.
  4. Why is algae called a plant?
  5. The chlorophyll experiment shows that leaves are the food factory. Why does the iodine turn blue.  Explain.



  1. If cuscuta/ dodder plant is parasitic plant, then why is it still called a plant? Justify your reasons.
  2. If pitcher plant eats insects, why is it called a plant? Give reasons for your answer.
  3. Why do farmers grow many fruits and vegetable crops inside large houses? What are the advantages to the farmer?
  4. Why do farmers like to grow leguminous plants between kharif and rabi crops as one of the crops during the year?