CBSE Class 10 Biology Heredity And Evolution Worksheet Set B

Read and download free pdf of CBSE Class 10 Biology Heredity And Evolution Worksheet Set B. Students and teachers of Class 10 Biology can get free printable Worksheets for Class 10 Biology in PDF format prepared as per the latest syllabus and examination pattern in your schools. Standard 10 students should practice questions and answers given here for Biology in Grade 10 which will help them to improve your knowledge of all important chapters and its topics. Students should also download free pdf of Class 10 Biology Worksheets prepared by school teachers as per the latest NCERT, CBSE, KVS books and syllabus issued this academic year and solve important problems provided here with solutions on daily basis to get more score in school exams and tests

Heredity And Evolution Class 10 Biology Worksheet Pdf

Class 10 Biology students should refer to the following printable worksheet in Pdf for Heredity And Evolution in standard 10. This test paper with questions and answers for Grade 10 Biology will be very useful for exams and help you to score good marks

Class 10 Biology Worksheet for Heredity And Evolution

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Heredity and Evolution 

Question :What factors could lead to the rise of a new species?
Answer: Natural selection, genetic drift and acquisition of traits during the life time of an individual can give rise to new species.


Question : How are the areas of study − evolution and classification − interlinked?
Answer: Classification involves grouping of organism into a formal system based on similarities in internal and external structure or evolutionary history.Two species are more closely related if they have more characteristics in common. And if two species are more closely related, then it means they have a more recent ancestor.


Question : Will geographical isolation be a major factor in the speciation of an organism that reproduces asexually? Why or why not?
Answer: Geographical isolation prevents gene flow between populations of a species whereas asexual reproduction generally involves only one individual. In an asexually reproducing organism, variations can occur only when the copying of DNA is not accurate. Therefore, geographical isolation cannot prevent the formation of new species in an asexually reproducing organism.


Question : Why are human beings who look so different from each other in terms of size, colour and looks said to belong to the same species?
Answer: A species is a group of organisms that are capable of interbreeding to produce a fertile offspring. Skin colour, looks, and size are all variety of features present in human beings. These features are generally environmentally controlled. Various human races are formed based on these features. However, there is no biological basis to this concept of races. Therefore, all human beings are a single species as humans of different colour, size, and looks are capable of reproduction and can produce a fertile offspring.


Question : Only variations that confer an advantage to an individual organism will survive in a population. Do you agree with this statement? Why or why not?
Answer: In species, variations that offer survival advantages are naturally selected. Individuals adjust to their environments with the help of these selected variations and consequently these variations are passed on to their progeny. Evolution of organisms occurs as a result of this natural selection.
However, there can be some other variations, which do not offer any survival advantage and arise only accidentally. Such variations in small populations can change the frequency of some genes even if they are not important for survival.
This accidental change in the frequency of genes in small populations is referred to as genetic drift.
Thus, genetic drift provides diversity (variations) without any survival advantage.


Question : Mendel took tall pea plants and short pea plants and produced F1 progeny through cross-fertilisation. What did Mendel observe in the F1 progeny? 
Answer: When Mendel cross fertilized tall pea plants and short pea plants, he observed that all plants in the F1 progeny were tall.


Question : Mendel crossed the round and green seeded pea plants with the wrinkled and yellow seeded pea plants. Give the phenotypic ratio of F2 generation.
Answer:  The phenotypic ratio of F2 generation when round and green seeded pea plants were crossed with the wrinkled and yellow seeded pea plants is: Round Yellow : Round Green : Wrinkled Yellow : wrinkled Green = 9 : 3 : 3 : 1.

Question : Are there any organisms where sex of the newborn is not genetically determined? Give example.
Answer:  Yes, there are organisms in which sex of the newborn is not genetically determined. An example is snail, which can change its sex.


Question : Give reason: Phenotypic and genotypic ratios are different.
Answer:  The phenotypic ratio in F2 generation when F1 tall plants are crossed with each other is Tall : Dwarf = 3 : 1 Whereas, the genotype ratio will be TT : Tt : tt = 1 : 2 : 1 . Here, both TT and Tt refer to tall plants, they have the same phenotype but different genotype.


Question : A group of grass hoppers - some green and some brown-lived in grassland having dry bushes and dry grass.
(A) Which one would normally be picked up by predatory birds and why?
(B) Population of which grasshopper will increase?
(C) Name this phenomenon.
Answer: (A) Green grasshoppers would be normally picked up by predatory birds because they can be easily seen in dry bushes and grasses as compared to brown grasshoppers.
(B) As brown grasshoppers would be eaten less, their population will increase.
(C) This phenomenon is called ‘Natural Selection’. It is based on the ‘Theory of Evolution’ proposed by Charles Darwin


More Question

Q1)Do all variations in a particular species have equal chances of survival in an environment?

Q2)Give scientific terms for;

a)the similarities with parents present in an offspring.

b)the differences with parents present in an offspring.

Q3)When is a recessive trait capable of expressing itself?write its expression with respect to height of plant(genotype).

Q4)When a pesticide is sprayed on a population of insects,all insects do not get killed but few of them survive.give reason.

Q5)In a mendeliancross,tall plants and purple flowers were crossed with dwarf plant and white flowers.How would you denote------------

a)the genotype pf the two parents.

b)the genotype and phenotype of F1 progeny.

c)the results obtained by selfing F1 progeny to get F2 progeny.give the ratio obtained in F2 generation.

 

More Important Questions For How Do Organisms Reproduce

Question :Tabulate two distinguishing features between acquired traits and inherited traits with one example of each.
Answer: 

Class 10 Science Heredity_4


Question : A cross between a tall plant (TT) and short pea plant (tt) resulted in progeny that were all tall plants because
(a) Tallness is the dominant trait
(b) shortness is the dominant trait
(c) Tallness is the recessive trait
(d) height of pea plant is not governed by gene ‘T’ or ‘t’
Answer: Correct option (a)

 

Question : A Mendelian experiment consisted of breeding pea plants bearing violet flowers with pea plants bearing white flowers. What will be the result in F1 progeny?
(a) Heterozygous plant with violet flowers.
(b) Homozygous plant with violet flowers
(c) Heterozygous plant with white flowers
(d) Homozygous plant with white flowers
Answer: Correct option (a)

 

Question :

(i) Define Genetics.
(ii)Who is regarded as the ‘Father of Genetics’? Name the plant on which he performed his experiment.
(iii)Why did he select that specific plant for his experiments?
Answer:

(i)Genetics is the branch of biology that deals with the study of heredity and variations.
(ii)Gregor Johann Mendel is regarded as the Father of Genetics. He performed his experiment on garden pea.
(iii)He selects garden pea plant for his experiment for following reasons
* Garden pea plants were easily available
* They grow in one season
* Fertilization was easy

 

Question. When a cell reproduces, what happens to its DNA?
Answer: When a cell reproduces, its DNA is copied and passed on to the offspring.

 

Please click the below link to access CBSE Class 10 Biology Heredity And Evolution Worksheet Set B

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