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Life Processes

This content is part of NCERT Solutions for Class 10 Science Chapter 6 Life Processes

INTRODUCTION :

All living organisms have arisen through the evolutionary process and show diversity, yet some similarities exist among them. e.g. Amphibians, reptiles and mammals have limbs for locomotion in water, fishes have fins for swimming in water and birds have wings for flying.

               •      A close examination reveals that the limb, fins and wings are formed on the same basic structural plan.

               •      All such examples can be explained if we consider that the diverse groups of organisms share a common ancestor from who they have diverged and formed two different species. Such process of change in biological system is called as evolution.

               •      The Doctrine of the Organic Evolution state that the organisms existing at present are the descendants of much simpler ancestors.

  16.2     EVOLUTION :

The term ‘Evolution’ means “unrolling or unfolding” change from one condition to another. It means members of a species change generation after generation with environmental requirements to turn into better organized and more complex new species. The changes in the properties of population of organisms or groups of such populations over the course of generations are considered as organic evolution. It is a process of cumulative change of living populations and in the descendant populations of organisms. In other words, it is “descent with modifications.” Evolution is a change in the genetic composition of a population. There is an inbuilt tendency of variation during reproduction, both because of errors in DNA copying and as a result of sexual reproduction.

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Management of Natural Resources

This content is part of NCERT Solutions for Class 10 Science Chapter 16 Management of Natural Resources

Question 1. What changes can you make in your habits to become more environment-friendly? Answer: We should use the formula of three R’s in our home in order to be environment friendly.

Reduce, i.e. to use less, and save the water and the electricity by stopping their wastage.

Recycle, i.e. to segregate the waste so that materials which can be recycled should be dumped in a place for recycling.

Reuse, i.e. to reuse certain materials like bottles Of jams and pickles for storing other kitchen items, etc.

Question 2. What would be the advantages of exploiting resources with short-term aims? Answer: There would be no advantage of exploiting resources with short-term aims. Their exploitation may appear to be advantageous in the short-term but it is highly disadvantageous in the long- term. By doing so, we may be able to enjoy the comforts Of life but we would damage our environment gradually.

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Management of Natural Resources

This content is part of NCERT Solutions for Class 10 Science Chapter 16 Management of Natural Resources

Question 1. What changes can you make in your habits to become more environment-friendly? Answer: We should use the formula of three R’s in our home in order to be environment friendly.

Reduce, i.e. to use less, and save the water and the electricity by stopping their wastage.

Recycle, i.e. to segregate the waste so that materials which can be recycled should be dumped in a place for recycling.

Reuse, i.e. to reuse certain materials like bottles Of jams and pickles for storing other kitchen items, etc.

Question 2. What would be the advantages of exploiting resources with short-term aims? Answer: There would be no advantage of exploiting resources with short-term aims. Their exploitation may appear to be advantageous in the short-term but it is highly disadvantageous in the long- term. By doing so, we may be able to enjoy the comforts Of life but we would damage our environment gradually.

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Human Eye and Colourful World

This content is part of NCERT Solutions for Class 10 Science Chapter 11 Human Eye and Colourful World

Question 1. What is meant by power of accommodation of the eye? Answer: The power Of accommodation of the eye is the ability of the eye to observe the distinct objects clearly which are situated at a large distance from the eye. The ciliary muscles are responsible to change the focal length Of the eye lens. The value of the power of accommodation Of the normal human eye is (d = 25 cm) = 100/f = 100/d = 100/25 = 4 dioptres. The value of power of accommodation Of human eye is about 4D

Question 2. A person with a myopic eye cannot see objects beyond 1.2 m distinctly. What should be the type of the corrective lens used to restore proper vision? Answer: The far point for myopic eye is 1.2m.

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Human Eye and Colourful World

This content is part of NCERT Solutions for Class 10 Science Chapter 11 Human Eye and Colourful World

Question 1. What is meant by power of accommodation of the eye? Answer: The power Of accommodation of the eye is the ability of the eye to observe the distinct objects clearly which are situated at a large distance from the eye. The ciliary muscles are responsible to change the focal length Of the eye lens. The value of the power of accommodation Of the normal human eye is (d = 25 cm) = 100/f = 100/d = 100/25 = 4 dioptres. The value of power of accommodation Of human eye is about 4D

Question 2. A person with a myopic eye cannot see objects beyond 1.2 m distinctly. What should be the type of the corrective lens used to restore proper vision? Answer: The far point for myopic eye is 1.2m.

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LIGHT

LIGHT :

This content is part of NCERT Solutions for Class 10 Science Chapter 10 Light Reflection and Refraction

Light is a form of electromagnetic energy that causes the sensation of vision.

           Optics :

             It is the branch of physics which deals with the study of light. It is mainly divided into three parts :

           (i) Geometrical optical or ray options: It deals with the reflection or refraction.

           (ii) Wave or physical optics: It is concerned with nature of light and deals with interference diffraction and

polarisation.      

(iii) Quantum optics : It deals with the interaction of light with the atomic entities of matter such as photo

electric effect, Atomic excitation etc.

  1.1 (a) Nature of Light :

             Theories about nature of light :

             (i)         Particle nature of light (Newton’s corpuscular theory(: According to Newton light travels in

space with a great speed as a stream of very small particles called corpuscles.

This theory was failed to explain interference of light and diffraction of light. So wave theory of light was discovered.

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LIGHT

LIGHT :

This content is part of NCERT Solutions for Class 10 Science Chapter 10 Light Reflection and Refraction

Light is a form of electromagnetic energy that causes the sensation of vision.

           Optics :

             It is the branch of physics which deals with the study of light. It is mainly divided into three parts :

           (i) Geometrical optical or ray options: It deals with the reflection or refraction.

           (ii) Wave or physical optics: It is concerned with nature of light and deals with interference diffraction and

polarisation.      

(iii) Quantum optics : It deals with the interaction of light with the atomic entities of matter such as photo

electric effect, Atomic excitation etc.

  1.1 (a) Nature of Light :

             Theories about nature of light :

             (i)         Particle nature of light (Newton’s corpuscular theory(: According to Newton light travels in

space with a great speed as a stream of very small particles called corpuscles.

This theory was failed to explain interference of light and diffraction of light. So wave theory of light was discovered.

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NCERT Solutions for Class 10 Maths Chapter 10 Circles (Hindi Medium) http://www.ncert-solutions.com/class-10-maths-chapter-10-circles-hindi

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Can you hate someone for what they have done, but still love them for whom they had been?

Jodie Picoult (via quotemadness)

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LIGHT

LIGHT :

This content is part of NCERT Solutions for Class 10 Science Chapter 10 Light Reflection and Refraction

Light is a form of electromagnetic energy that causes the sensation of vision.

           Optics :

             It is the branch of physics which deals with the study of light. It is mainly divided into three parts :

           (i) Geometrical optical or ray options: It deals with the reflection or refraction.

           (ii) Wave or physical optics: It is concerned with nature of light and deals with interference diffraction and

polarisation.      

(iii) Quantum optics : It deals with the interaction of light with the atomic entities of matter such as photo

electric effect, Atomic excitation etc.

  1.1 (a) Nature of Light :

             Theories about nature of light :

             (i)         Particle nature of light (Newton’s corpuscular theory(: According to Newton light travels in

space with a great speed as a stream of very small particles called corpuscles.

This theory was failed to explain interference of light and diffraction of light. So wave theory of light was discovered.

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NCERT Solutions for Class 10 Maths Chapter 10 Circles (Hindi Medium) http://www.ncert-solutions.com/class-10-maths-chapter-10-circles-hindi

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NCERT Solutions for Class 10 Maths Chapter 9 Some Applications of Trigonometry (Hindi Medium) http://www.ncert-solutions.com/class-10-maths-chapter-9-some-applications-of-trigonometry-hindi

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NCERT Solutions for Class 10 Maths Chapter 8 Introduction to Trigonometry (Hindi Medium) http://www.ncert-solutions.com/class-10-maths-chapter-8-introduction-to-trigonometry-hindi

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NCERT Solutions for Class 10 Maths Chapter 7 Coordinate Geometry (Hindi Medium) http://www.ncert-solutions.com/class-10-maths-chapter-7-coordinate-geometry-hindi

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NCERT Solutions for Class 10 Maths Chapter 6 Triangles (Hindi Medium) http://www.ncert-solutions.com/class-10-maths-chapter-6-triangles-hindi #NcertSolutionsForClass10Maths #NcertSolutionsForClass10MathsChapter6

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NCERT Solutions for Class 10 Maths Chapter 5 Arithmetic Progressions (Hindi Medium) #NcertSolutionsForClass10Maths #NcertSolutionsForClass10MathsChapter5

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NCERT Solutions for Class 10 Maths Chapter 4 Quadratic Equations (Hindi Medium) #NcertSolutionsForClass10Maths #NcertSolutionsForClass10MathsChapter4