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Subject:

science-biology

Class:

class VII

Key Concepts

photosynthesis, xylem, phloem, transpiration, vascular tissues, stomata, root hair

essential questions

1. Do you think photosynthesis and transpiration play an important role in maintaining the world ecosystems?
2. What would happen if photosynthesis did not occur?

Remembering:

  1. What is the source of photosynthesis?
  2. Which gas is taken in and which one is taken out during photosynthesis?
  3. Which gas is taken in and which one is given out in bright sun light?
  4. Explain how photosynthesis is different from transpiration.
  5. Do plants respire all day and night or only during night.
  6. What happens to the energy liberated during respiration?
  7. In order to carry out photosynthesis what are the substances plants must take in? Also mention their sources
  8. What is the role of chlorophyll in photosynthesis.
  9. Name the different tissues that transport food to different parts of the plants.
  10. Define transpiration
  11. Define tissues

MCQ

  1. Carbohydrates are stored by plants in the form of: a) Vitamins  b) Glucose  c) protiens  d) fats
  2. What is the source of energy for photosynthesis? a) Water  b) Minerals  c) Starch  d) sunlight
  3. Which of the following four are needed for photosynthesis in a leaf: a) carbon di oxide  b) oxygen  c) nitrates d) water  e) chlorophyll  f) soil  g) light
  4. Stomata are present on the surface: a)  stems  b) roots  c) leaves   d) flower petals
  5. Which one is the end product of photosynthesis: a) fructose  b) Glucose  c) Cellulose  d) lactose
    1. Match the following:-

    Column I                                                                          Column II

    a) Plants                                                                            i) Saprotrophs

    b) Animals                                                                        ii) Autotrophs

    c) Pitcher Plant                                                               iii) Heterotrophs

    d) Fungi                                                                            iv) Insectivorous

    e) Lichens                                                                         v) Symbiotic relationship

    f) Cuscuta (Amarbel)                                                       vi) Parasitic Plants

     

    1. Fill in the blanks.

    i) The conversion of complex food is called ________________

    ii) A ____________ is an association of symbiotic relationship between an alga and a fungus.

    iii) A plant that has both autotrophic as well as heterotrophic mode of nutrition is ____________.

    iv) The relationship in which two different organisms live together in such a way that benefit each other in some way is called the _______________.

  6. Compare the leaf with a factory:

understanding:

  1. Why do leaves look green?
  2. Do plants need oxygen? If so, what is its source.
  3. What is the need of root hair in plants?
  4. Differentiate between xylem and phloem
  5. How is transpiration different from respiration?
  6. Why is transpiration necessary in plants?
  7. . Correct the following sentences by correcting the highlighted words:

    a) Roots are the main site of photosynthesis in plants. Ans. ______________________________________________________________

     

    b) Root Hair provides low surface area. Ans. ______________________________________________________________

    c) Green pigment present in leaves is rhizobium. Ans. ______________________________________________________________

  8. What is chlorophyll and what is its function?
  9. Explain the process of photosynthesis.
  10.  

    MCQ:

1.  They are pipe like consisting of a group of specialized cells. They transport substances and form a two way traffic in plants. Which of the following terms do they qualify? a) Xylem tissues  b) Vascular tissues c) Root Hairs  d) Pholem tissues

2. In a tall tree which of the following is responsible for pulling water and minerals: a) Gravitational force b) Suction force  c) Conduction force  d) Transportation force

3. Plants use other mode of producing food other than photosynthesis: a) Parasitic Mode b) Saprophytic mode c) Insectivorous Mode  d) All of the above

Application:

  1. How do root hairs help in increase in absorption capacity of plants?
  2. Why do plants absorb large quantities of water from soil?
  3. Tina has uprooted a Rose plant from the soil. Most of the hair roots are left in the soil. She has replanted it in a new soil and a different pot. She has been watering it every day. Will the plant grow back? Give your reasons.
  4. What is translocation and how is it different from Transpiration?
  5. True or False. Give reasons :

i) A cell dipped in hypertonic solution will be plasmolysis.

ii) Osmosis is the process of movement of water molecules from a region of lower solute to higher solute concentration

iii) Fresh Grapes are kept in a sugar solution, they will remain flaccid/ intact.

iv) Xylem fibres provide structural support to the plant

v) Phloem tubes are found only in the leaves o the plants as this is where sugar is made

6. Guttation is the process by which plants loose water in liquid form through hydathodes. Why do you think this process has evolved among plants.

7. Nitrogen is needed for building proteins. From where do plants get their source of Nitrogen.

 

Analysis:

  1. Water absorption through roots can be increased by keeping plants in the shade or under the fan. Choose the correct option and give your reasons
  2. Tanmay took a potted, well watered plant and set up an experiment as shown in the figure below where he covered some part of the stem and few leaves in a polythene bag. Can you tell how the water droplets are being collected in the polythene bag.
  3. Study the given flow chart carefully and select the option which is a correct match of xylem and phloem? 

    Xylem                     Phloem

    1. P                     R
    2. R                     S
    3. S                     Q
    4. Q                    R

Evaluation:

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