Life Processes: Class 10 Science Q&A
107 free answers on Life Processes (Science) for Class 10 students, across CBSE, ICSE and State boards. Includes questions such as “How do carbohydrates, proteins and fats get digested in human beings?”, “Explain the importance of soil for plant growth.”, “Explain the process of breathing in man”.
Question & Answer
Questions
- ScienceClass 10CBSE
How do carbohydrates, proteins and fats get digested in human beings?
Carbohydrate Digestion Digestion of cabohydrates starts with buccal cavity where salivary enzymes breaks down the starch into simple sugar molecules. Other sugar molecules are breakdown to glucose in small intestine. Protein digestion Proteins are partially digested by pepsin secreted by gastric glands present in the stomach. Then Pancreatic juice secrets trypsin and chymotrypsin enzymes in small intestine where complete digestion of p
- ScienceClass 10CBSE
Explain the importance of soil for plant growth.
Soil is very important for the growth of the plant for the following reasons. Soil provides the base for the growth of the plants and provides a platform for the penetration of It acts as a reservoir of the Soil has different minerals essential for the growth of the plant. Soil is the only medium from which soil obtain nutrients. Soil has organic materials essential for the growth of the Soil has
- ScienceClass 10CBSE
Explain the process of breathing in man
Breathing in Humans has two processes 1) Inhalation 2) Exhalation Inhalation: Inhalation is the process of taking oxygen. During this process, ribs come out and diaphragm moves down. This increases the volume of the lungs and decreases the pressure. This will make the air move towards the lungs. Exhalation: Exhalation is a process of throwing out carbon-dioxide. During this process, ribs go down and diaphragm moves up. This decreases the volume of the lungs and increas
- ScienceClass 10CBSE
Explain the process of nutrition in Amoeba.
Amoeba shows holozoic nutrition which is comprised of Ingestion, Digestion, Absorption, Assimilation and Egestion. Ingestion: Ameoba traps food particles through fingerlike projections called as pseudopodia. Pseudopodia present outside its body and helps in taking food along with water Digestion: Food vacuoles are made after ingesting the food. Enzymes are released in the food vacuole for digestion. Absorption:<
- ScienceClass 10CBSE
How do leaves of plants help in excretion?
Leaves plays an important role in excretion in plants because CO2 is expelled out through pores of stomata present in the leaf. Plants shed leaves to get rid of excretory products deposited on them.
- ScienceClass 10CBSE
Why is transpiration important for plants?
Transpiration is important for plants because of the following reasons. It creates transpiration pull to facilitate ascent of Ascent of sap is necessary to make water available for It helps a plant to get rid of excess
- ScienceClass 10CBSE
Why and how does water enter continuously into the root xylem?
Soln: Water should enter the root xylem continuously to assist the various process such as photosynthesis. Continuous flow of water into root xylem is due to transpiration pull.
- ScienceClass 10CBSE
Plants have low energy needs as compared to animals. Explain.
Most of the transport in plants occur through passive transport which does not require energy and plants stand still at one place and they will not travel in search of food Hence Plants require low energy compared to animals.
- ScienceClass 10CBSE
What will happen if platelets were absent in the blood?
Platelets are responsible for the clotting of the blood. If platelets are absent bllod will not clot. In case of injuries blood flow cannot be stopped without clotting and this may prove fatal for the person.
- ScienceClass 10CBSE
Why do veins have thin walls as compared to arteries?
Blood flow through veins does not exert pressure on walls of veins hence they have thin walls. Blood flow in arteries exerts high pressure on arterial walls hence they need thick walls.
- ScienceClass 10CBSE
Name the correct substrates for the following enzymes (a) Trypsin (b) Amylase (c) Pepsin Lipase
Soln: Protein Starch Protein Lipid
- ScienceClass 10CBSE
Match the terms in Column (A) with those in Column (B) Column (A) Column (B) (a) Trypsin (i) Pancreas (b) Amylase (ii) Liver (c) Bile (iii) Gastric glands (d) Pepsin (iv) Saliva
Soln: Column (A) Column (B) (a) Trypsin (i) Pancreas (b) Amylase (iv) Saliva (c) Bile (ii) Liver (d) Pepsin <
- ScienceClass 10CBSE
What are the functions of gastric glands present in the wall of the stomach?
Hydrochloric acid, pepsin and mucus are secreted by gastric gland present in the stomach. They have following functions. HCL Kills germs present in the food and it decreases PH of the stomach which is essential for the working of digestive enzymes. Pepsin digests protein. Mucus protects stomach’s innerline from HCL.
- ScienceClass 10CBSE
Explain the role of mouth in digestion of food.
Role of mouth in digestion of food. Ingestion of food Breakage of food by Mastication Saliva aids easy swallowing of food Salivary amylase breaks starch into simpler
- ScienceClass 10CBSE
What is common for cuscuta, ticks and leeches?
These all are parasite. They live on or inside another body to obtain food from the host. In obtaining food parasites always harm their host.
- ScienceClass 10CBSE
In each of the following situations what happens to the rate of photosynthesis? (a) Cloudy days (b) No rainfall in the area (c) Good manuring in the area Stomata get blocked due to dust
Soln: Rate of photosynthesis will reduce due to availability of Rainfall will not affect rate of Photosynthesis Manuring will not affect rate of Photosynthesis Blockage of stomata will reduce the rate of photosynthesis because blockage will affect availability pf Carbon-di-oxide.
- ScienceClass 10CBSE
Mention the major events during photosynthesis
Major events of Photosynthesis are Absorption of light energy by chlorophyll Conversion of light energy into chemical energy Splitting of water molecules into Hydrogen and Oxygen Reduction of CO2 to from
- ScienceClass 10CBSE
What is the advantage of having four chambered heart?
Four chambered heart has the following advantages Clear cut division of labors among different chambers Segregation of oxygenated and deoxygenated blood in the Efficiency of the heart will
- ScienceClass 10CBSE
Why is blood circulation in human heart called double circulation?
In Humans blood flow in two direction simultaneously in one cardiac cycle. Oxygenated blood comes to heart from lungs and at the same time de-oxygenated blood goes from Heart towards lungs. Because of this double movement is blood circulation in human heart called double circulation.
- ScienceClass 10CBSE
Match Group (A) with Group (B) Group A Group B (a) Autotrophic nutrition (i) Leech (b) Heterotrophic nutrition (ii) Paramecium (c) Parasitic nutrition (iii) Deer (d) Digestion in food vacuoles (iv) Green plant
Group A Group B (a) Autotrophic nutrition (iv) Green plant (b) Heterotrophic nutrition (iii) Deer (c) Parasitic nutrition (i) Leech (d) Dig