Water used in photosynthesis is taken up from the soil by the roots in terrestrial plants. It is transported to the leaves through the xylem tissue...
Distinguish between a parasite and a saprotrophs?
Parasite
• A parasite takes readymade food from the organism on which it feeds.
• They feed on a living organism.
• The organism on which it feeds is called host.
• It deprives the host of valuable...
What is digestion?
The process of breaking down complex food substances into simple molecules is called as digestion...
What does the human digestive tract consists of?
Digestive system in human beings consists of alimentary canal and digestive glands.
Alimentary canal is made up of mouth, buccal cavity, pharynx, oesophagus, stomach, intestine, rectum and anus.
The digestive...
How do plants obtain carbon-dioxide for photosynthesis?
Carbon dioxide from air is taken in through the tiny pores present on the surface of the leaves. Such pores are called stomata. Massive amounts of gaseous exchange takes place in the leaves through these pores for the purpose...
How do plants obtain nitrogen?
Nitrogen is an essential element used in the synthesis of proteins and other compounds. This is taken up in the form of inorganic nitrates or nitrites. Or it is taken up as organic compounds which have been prepared by bacteria...
What is the role of stomach in digestion?
The stomach is divided into three compartments namely cardiac, fundus and pylorus. The junction of oesophagus and stomach is guarded by valve which does not allow the food to travel in backward direction.
• In the...
What is the function of the small intestine?
The three main categories of nutrients that undergo digestion within the small intestine are proteins, lipids (fats) and carbohydrates. The small intestine is divided into duodenum, ileum and jejunum.
The...
How do plants obtain nitrogen?
Nitrogen is an essential element used in the synthesis of proteins and other compounds. This is taken up in the form of inorganic nitrates or nitrites. Or it is taken up as organic compounds which have been prepared by bacteria...
How will you prove that sunlight is essential for photosynthesis and the food prepared by green plants using photosynthesis is starch?
Let us do an activity to prove that sunlight is necessary for photosynthesis-
• We take a potted plant having green leaves and place it in a completely dark place for about three days to destarch its leaves. So, in the...
How do plants obtain carbon-dioxide for photosynthesis?
Carbon dioxide from air is taken in through the tiny pores present on the surface of the leaves. Such pores are called stomata. Massive amounts of gaseous exchange takes place in the leaves through these pores for the purpose...
What are the important events that occur during the process of photosynthesis?
The following events occur during this process -
(i) Absorption of light energy by chlorophyll.
(ii) Conversion of light energy to chemical energy and splitting of water molecules into hydrogen and oxygen.
(iii) Reduction...
What is meant by photosynthesis?
It is the process by which autotrophs (green plants) make their own food from carbon dioxide and water which is converted into carbohydrates in the presence of sunlight and chlorophyll. During this process, oxygen gas is...
What are the raw materials for photosynthesis?
The raw materials and other necessary items required for photosynthesis are Sunlight, Water, CO2 and Chlorophyll.&nbs...
What are the two types of heterotrophic nutrition?
Heterotrophic nutrition can be further divided into two types, viz. saprophytic nutrition and holozoic nutrition.
Saprophytic Nutrition: In saprophytic nutrition, the organism secretes the digestive juices on the food....
What are the types of nutrition?
Types of Nutrition:
Autotrophic Nutrition: The mode of nutrition in which an organism prepares its own food is called autotrophic nutrition. Green plants and blue-green algae follow the autotrophic mode of nutrition.
Heterotrophic...
What are nutrients?
Nutrients: Materials which provide nutrition to organisms are called nutrients. Carbohydrates, proteins and fats are the main nutrients and are called macronutrients. Minerals and vitamins are required in small amounts...
What is meant by life processes?
Various functions carried out by living beings; which are necessary to maintain and continue life are called life process. Following are the life processes in living beings:
• Nutrition
• Respiration
• Transportation...
What is the need for nutrition?
Organisms need energy to perform various activities. The energy is supplied by the nutrients. Organisms need various raw materials for growth and repair. These raw materials are provided by nutrients....
When we are asleep we are not performing any activity still our life processes are going on. Why?
The maintenance functions of living organisms must go on even when they are not doing anything particular. That is why the life processes are going on even while we are asleep or not performing any activity.&nbs...
What is meant by nutrition?
Nutrition is the process by which an organism obtains the food from its environment and utilizes it for various life processes like growth, replacement of tissues, energy etc....
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