Why Do Organisms Need Nutrients

Question

Answer the following questions in your own words.
(a) Why do living organisms demand nutrition ?
(b) Explain the process of production of food in plants.
(c) What is meant by parasitic plants ? Name their different types with examples of each.
(d) Explain the various steps of nutrition in animals.
(e) Proper name some unicellular organisms in which all life-processes take identify within their unicellular body.

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Solution

a. Nutrition is the process of uptake of nutrients from food and utilizing them for various functions of the cells. Nutrition is required for purposes like:

• supplying the energy required for doing piece of work
• for growth and evolution of the torso
• to fight diseases
• to supercede the damaged cells and repair tissues

b. Leaves are the food factories of plants. They are the sites where the synthesis of food occurs in plants. The leaves of plants contain a dark-green pigment chosen chlorophyll. This paint captures the sun's free energy, which is used to set up food from carbon dioxide and water. The process of synthesis of nutrient using sunlight, carbon dioxide, and h2o is known as photosynthesis. During the process of photosynthesis, the leaves containing chlorophyll catechumen carbon dioxide and h2o into carbohydrates in the presence of sunlight. Carbohydrates, which are produced during photosynthesis, are ultimately converted into starch to be stored in plants.This process tin be represented in the class of the following equation:

c. Cuscuta survives by growing on the trunk of some other plant and deriving nutrients from this plant in the procedure. This fashion of nutrition is known every bit parasitic manner of diet. Cuscuta is known equally a parasite as it depends on another institute for its survival. The found on which it grows is known as the host. Cuscuta can exist seen around in the form of yellowish tubular structures growing on the stems of other plants. It is devoid of leaves. Another such example of parasitic plants is Loranthus.

d. The various steps of nutrition in animals are:

• Ingestion − The process of taking in of food into the body is called ingestion. Ingestion of food in humans is done with the help of the buccal cavity.
• Digestion − The procedure where conversion of food into soluble form occurs.
• Absorption − The nutrients from the digested nutrient are absorbed in the small intestine with the help of finger-like projections chosen villi.
• Assimilation − The absorbed nutrients are transported via the blood vessels to the different organs, to be utilised for different life processes.
• Egestion − The process of removal of faecal matter through the anus is called egestion.

eastward. The unicellular organisms in which all life processes take place inside their torso are- Amoeba, Paramoecium and Euglena.

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Why Do Organisms Need Nutrients,

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