Life process NCERT question answer

NCERT Solutions For Class 10 Science Chapter 6 Life Processes:

In this article, you will find all the necessary information regarding NCERT Solutions For Class 10 Science Chapter 6 Life Processes. Students who are planning to build their career stream in the field of medicine can refer to this article as biology plays a major role in the medical field. Candidates having strong command over life processes class 10 NCERT solutions will be able to easily crack the competitive exams like NEET, AIIMS, JIPMER, etc.,

In this Article, we have covered all the NCERT exercise questions of science class 10 ch6 Life processes

Q1. The kidneys in human beings are a part of the system for

a). Nutrition

b). Excretion

c). Respiration

d) transportation

Ans:- (b) excretion

Q2. The Xylem in plants are responsible for

a). Transport of amino acids

b). Transport of food

c). Transport of water

d). Transport of oxygen

Ans:- (c). Transport of water

Q3. The autotrophic mode of nutrition requires

a). Carbon dioxide

b). Chlorophyll

c). Sunlight

d). All of these

Ans:- (d) all of these

Q4. The breakdown of pyruvate to give carbon dioxide water and energy takes place in

a). Cytoplasm

b). Mitochondria

c). Chloroplast

d). Nucleus

Ans:- (b). Mitochondria

Q5. How are fats digested in our bodies? Where does this process takes place?

Ans:- the small intestine is the site of the complete digestion of fats. the food coming from the stomach is acidic and has to be made alkaline for the pancreatic enzymes to act. It is made alkaline by bile juice secreted by the liver. The upper part of a small intestine also called duodenum, receives bile juice from the liver and the enzyme lipase from the pancreas. While solts break them down into smaller globules there by increasing eficiency of enzyme action and lipase breakdown the emulsified fats. The wall of the small intestine contains glands which secret intestinal juice. The enzymes present in IT finally convert the fats into fatty acids and glycerol. These are observed by villi I and past to every cell for obtaining energy.

Q6. What is the role of saliva in the digestion of food?

Ans:- saliva contains an enzyme called salivary amylase which digests the starch (complex molecule) present in food into sugar (maltose).

Q7. What are the necessary conditions for autotrophic nutrition and what are its by-products?

Ans:- the conditions necessary for autotrophic nutrition are sunlight, chlorophyll, carbon dioxide and water. The by products of autotrophic Nutrition are water and oxygen.

Q8. What are the differences between aerobic and anaerobic respiration? Name some organisms that use the anaerobic modes of respiration.

Ans:-

Aerobic Respiration:-

•Aerobic respiration takes place in the presence of oxygen.

•complete breakdown of food occurs in it.

• the end products are carbon dioxide and water.

• it produces a considerable amount of energy due to complete oxidation of food

• Ex:- Human beings, animals

Anaerobic Respiration:-

• Anaerobic respiration takes place in the absence of oxygen.

• incomplete breakdown of food occurs.

• the end products may be ethyl alcohol and carbon dioxide or lactic acid

• much less energy is produced due to incomplete oxidation of food.

Organisms that use the anaerobic respiration are Yeast, some bacteria and some parasitic worms.

Q9. How are the alveoli designed to maximize the exchange of gases?

Ans:- Alveoli are small pouches or sac-like structure. They are surrounded by blood capillaries. More than millions of alveoli are present in the lungs. The presence of millions of alveoli in the lungs provides a very large surface area for the exchange of gases. When we breathe in, the alveoli expand and proverb maximize the change of gases.

Q10. What would be consequences of a deficiency of hemoglobin in our body?

Ans:- the deficiency of hemoglobin in our body is called anaemia. In anaemia the blood is unable to carry sufficient amount of oxygen required by the body. So respiration would be less and less energy will be available to the body. The hemoglobin deficient person will feel weak, pale, lethargic and will be unable to perform heavy physical work.

Q11. Describe double circulation in human beings. Why is it necessary?

Ans:- in human beings the blood goes through the heart twice during each cycle, i.e the blood passes through the human heart two times to supply once to the whole body. It is called double circulation of blood. Further, double circulation include systematic and pulmonary circulation.

• Systematic circulation:- it supplies oxygenated blood from left auricle to left ventricle, which is pump to Aorta to distribute blood to various body parts. The deoxygenated blood is collected from various body organs by the veins to pour in vena cava and finally into the right atrium. Right atrium transfers this blood into the right ventricle.

• Pulmonary circulation:- the deoxygenated blood is pushhed by the right ventrical into the lungs for oxygenation through pulmonary artery. The oxygenated blood is brought back to left atrium of the human heart through pulmonary vein. From left atrium the oxygenated blood post into the left ventricle. The left ventricle pumps oxygenated blood into a water for systematic circulation.

• necessity of double circulation:- in human, having four chambered heart, the left side and right side of heart are completely separated to prevent the oxygenated blood from deoxygenated from mixing. Such as separation allows a highly efficient supply of oxygen to the body cells. Which is necessary for producing a lot of energy. This energy is useful in case of human beings that have a high energy need because then needs energy to maintain their body temperature.

Q12. What are the differences between the transport of materials in xylem and phloem?

Ans:-

Transport in xylem:-

• It transport water and minerals.

• The moment a generally unidirectional.

• IT is not influenced by metabolic inhibitors.

• it is carried but by xylem vessels and tracheads.

• major operating forces are diffusion and transpiration.

Transport in phloem:-

• it transports organic nutrients.

• the movement is multidirectional.

• phloem transport is inhibited by metabolic inhibitors.

• takes place in Sieve tube with the help of companion cell.

• energy is required for translocation.

Q13. Compare the functioning of alveoli in the lungs and nephrons in the kidneys with respect to their structure and functioning.

Ans:- Alveoli:-

• it's a structure is that of a pouch like air sac.

• the walls of alveoli are very thin.

• Alveoli's are surrounded by thin blood capillaries.

• it's main function is to increase the surface area for exchange of gases.

Nephron:-

• they are elongated tubules.

• each nephron has two compartment, glomerules and Bowman's capsule.

• blood capillaries form two patches_: glomerules and peri tubular capillaries.

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