Topic outline

    • Nutrition in Plants

       

      Question 22: 
      Where is nucleus located in a cell?

      Answer: 

      In most of the cell, nucleus is centrally located.

       

      Question 23: 
      What are carbohydrates made up of?

      Answer: 

      The carbohydrates are made of carbon, hydrogen and oxygen.

       

      Question 24: 
      From where do plants get raw materials to prepare their food? 

      Answer: 

      Plants get raw materials to prepare their food from their surroundings.

       

      Question 25: 
      Where does the synthesis of food in a plant usually take place?

      Answer: 

      The synthesis of food in plants occurs in leaves.

       





      Question 26: 
      What is the ultimate source of energy for all living organisms?

      Answer: 

      Sun is the ultimate source of energy for all living organisms.

       

      Question 27: 
      Write an equation that represents the process photosynthesis.

      Answer:


       

      Question 28: 
      Name the microorganisms which can fix atmospheric nitrogen in the soil.

      Answer: 

      Bacteria like Rhizobium can fix atmospheric nitrogen in the soil.

       

      Question 29: 
      What are the components of food?

      Answer: 

      Carbohydrates, proteins, fats, vitamins and minerals are components of food.

       





      Question 30: 
      What are insectivorous plants?

      Answer: Insect-eating plants such as pitcher plant are called insectivorous plants.

       

      Question 31: 
      What do you mean by nutrition?

      Answer: 

      Nutrition is the mode of taking food by an organism and its utilisation by the body.

       

      Question 32: 
      What do you mean by nutrition?

      Answer: 

      Nutrition is the mode of taking food by an organism and its utilization by the body.

       

      Question 33: 
      What are the different modes of nutrition found in plants?

      Answer: 

      (i) Autotrophic mode of nutrition

      (ii) Heterotrophic mode of nutrition

       





      Question 34: 
      List some harmful effect of fungi.

      Answer:

      1. Some fungi cause diseases in plants, animals including humans.

      2. They spoil fruits, vegetables and other foodstuff.

       

      Question 35: 
      Why photosynthesis is named so?

      Answer: 

      Since the synthesis of food occurs in the presence of sunlight, it is called photosynthesis (Photo: light; synthesis: to combine).

       

      Question 36: 
      What is the association of fungus and algae called?
      Or
      What is the symbiotic relationship between algae and fungi?

      Answer: 

      In organisms called lichens, a chlorophyll-containing partner, which is an alga, and a fungus live together.

       





      Question 37: 
      What are the other parts of plant where photosynthesis occurs except leaves?

      Answer: 

      Besides leaves, photosynthesis also takes place in other green parts of the plant — in green stems and green branches.

       

      Question 38: 
      What are heterotrophs? 

      Answer: 

      Animals and most other organisms take in ready-made food prepared by the plants. They are called heterotrophs (heteros = other).

       

      Question 39: 
      What are stomata?

      Answer: 

      Tiny pores are present on the surface of the leaves which helps in exchange of gases. Such pores are called stomata.

       

      Question 40: 
      What are called autotrophs?

      Answer: 

      Organisms able to make food themselves from simple substances are called autotrophs.

       





      Question 41: 
      What is heterotrophic nutrition?

      Answer: 

      Heterotrophic nutrition is the mode of nutrition in which organisms depend upon other organisms to survive.

       

      Question 42: 
      What are nutrients?

      Answer: 

      Carbohydrates, proteins, fats, vitamins and minerals are components of food. These components of food are called nutrients.

       

      Question 43: 
      What is chlorophyll?

      Answer: 

      A green pigment present in all green plants which helps leaves to capture the energy of the sunlight is called chlorophyll.

       

      Question 44: 
      Where and in what conditions do fungi grow?

      Answer: 

      Fungi grow on pickles, leather, clothes and other articles that are left in hot and humid weather for long time.

       





      Question 45: 
      How do fungi grow and develop?

      Answer: 

      The fungal spores are generally present in the air. When they land on wet and warm things they germinate and grow.

       

      Question 46: 
      Why algae are green in colour?

      Answer: 

      They contain chlorophyll which gives them the green colour. Algae can also prepare their own food by photosynthesis.

       

      Question 47: 
      What are the tiny openings on the surface of a leaf called?

      Answer: 

      Tiny pores are present on the surface of the leaves which helps in exchange of gases. Such pores are called stomata.

       

      Question 48: 
      What is the role of guard cells in stomata?

      Answer: 

      Guard cells help to regulate the rate of transpiration by opening and closing the stomata.

       





      Question 49: 
      What are the raw materials required for photosynthesis?
      Or
      What are the various raw materials for photosynthesis?

      Answer: 

      Chlorophyll, sunlight, carbon dioxide and water are necessary to carry out the process of photosynthesis.

       

      Question 50: 
      What are called parasites?

      Answer: 

      Parasites are those organisms which grow on other plants or animals for their food. Example: Cuscuta

       

      Question 51: 
      Do insectivorous plants perform photosynthesis?

      Answer: 

      Insectivorous plants got leaves therefore they can photosynthesis, which means they can prepare their food in the presence of sunlight.

       

      Question 52: 
      Why can't humans or animals prepare their own food using CO2 water and minerals as the green plants do?

      Answer: 

      Plants can make their food themselves but humans or animals cannot because they do not possess chlorophyll pigment for photosynthesis.