Food is essential for all living organisms. You also learnt that carbohydrates, proteins, fats, vitamins and minerals are components of food. These components of food are called nutrients and are necessary for our body.
All living organisms require food. Plants can synthesise food for themselves but animals including humans cannot. They get it from plants or animals that eat plants. Thus, humans and animals are directly or indirectly dependent on plants.
Question Answer
(1) How food nutrients help living organism?
Ans - The food nutrients in our living organism to build their bodies to grow to repair damage parts of their bodies and provide the energy to carry out life process.
(2) What is photosynthesis?
Ans - Leaves of plants synthesize food from carbon dioxide and water represents of sunlights and chlorophyll this process is called photosynthesis CO2 + H2O sunlight /chlorophyll carbohydrates + O2
(3) How nitrogen is absorbed by plants?
Ans - Soil has certain bacteria that convert gaseous nitrogen into a usable form and release it into the soil the soluble forms are absorbed by the plants along with water.
(4) What is saprotrophic nutrition?
Ans - The mode of nutrition in which organism take in the nutrients and in solution form dead and decaying matter is called saprotrophic nutrition.
(5) How fungi appear suddenly during the rainy season?
Ans - Answer fungi appear suddenly during the rainy season on bread, pickles, leather, clothes and other articles because weather is hot and humid.
(6) How would you test the presence of starch in leaves?
Ans - We take a small quantity of a food item or a raw ingredient we put 2_3 drops of dilute iodine solution on it a blue black colour indicates that eat contains a starch.
(7) Differentiate between autotrophs and heterotrophs.
Ans - Green plants are called autotrophs as they prepared their own food from simple substances but animals and most other organisms are called heterotrophs as they like take in readymade food prepared by the plants.
(8) How water and minerals are transported to leaves from roots?
Ans - There are vessels inside of plant which run like points pipes throw out the root system branch and leaves by going through this lives vessels waters and minerals and transported to leaves from roots.
(9) Explain the role of chlorophyll in the process of photosynthesis?
Ans - Chlorophyll is the green colour pigment which helps lives to capture energy from sunlight to carry out the food making process of plants why the leaves it is the green photosynthesis pigment which provides energy necessary for photosynthesis.
(10) How humans and animals are directly or indirectly dependent on plants?
Ans : All living organism require food plants can make their food themselves by organic substances but anyone including humans cannot make their food themselves they get it from plants or animals that eat plants thurs you must and animals are directly or indirectly dependent on plants.
(11) Whether food is made in all parts of a plant or only in certain parts?
Ans - Only certain parts of plants like leaves have green pigment called chlorophyll solution are called the food factories is of plants besides lives photosynthesis also text place in other green parts of the plant like in other green parts of the plant like in green steam and green branches the desert plants have a scale or desine like leaves to reduce loss of water by transpiration out the process of photosynthesis.
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