Curriculum

Ncert Class 10 - science - Biology

Chapter 5 - Life Process

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Short Notes-Class 10 -Science- Biology-Chapter 5 - Life Processes

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PRACTICE TEST-1-Class 10 -Science- Biology-Chapter 5 - Life Process

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PRACTICE TEST 2-Class 10 -Science- Biology-Chapter 5 - Life Processes

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Very Short Questions -Class 10 -Science- Biology-Chapter 5 - Life Processes

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Short Questions - Class 10 -Science-Biology-Chapter 5 - Life Processes

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Long Answer -Class 10 -Science- Biology-Chapter 5 - Life Processes

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Chapter 6 -Control and Coordination

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Short Notes -Class 10 -Science- Biology-Chapter 6 - Control and Coordination

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PRACTICE TEST -1 -Class 10 -Science Biology-Chapter 6 - Control and Coordination

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PRACTICE TEST -2 -Class 10 -Science Biology-Chapter 6 – Control and Coordination

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Self Assessment -Class 10 -Science- Biology-Chapter 6 - Control and Coordination

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Very Short Answer-Class 10 -Science- Biology-Chapter 6 - Control and Coordination

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Short Answer-Class 10 -Science- Biology-Chapter 6 - Control and Coordination

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Long Answer-Class 10 -Science- Biology-Chapter 6 - Control and Coordination

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Chapter 7: How Do Organisms Reproduce

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Short Notes-Class 10 -Science- Biology-Chapter 7: How Do Organisms Reproduce

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Points to remember-Class 10 -Science- Biology-Chapter 7: How Do Organisms Reproduce

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PRACTICE TEST 1 -Class 10 -Science- Biology-Chapter 7: How Do Organisms Reproduce

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PRACTICE TEST 2 -Class 10 -Science-Biology-Chapter 7: How Do Organisms Reproduce

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Self Assessment -Class 10 -Science- Biology-Chapter 7: How Do Organisms Reproduce

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Very Short answer -Class 10 -Science- Biology-Chapter 7: How Do Organisms Reproduce

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Short answer -Class 10 -Science- Biology-Chapter 7: How Do Organisms Reproduce

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Chapter 8 :Heredity and Evolution

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Points To Remember -Class 10 -Science-Biology-Chapter 8 :Heredity and Evolution

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PRACTICE TEST- 1-Class 10 -Science-Biology-Chapter 8 :Heredity and Evolution

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PRACTICE TEST- 2-Class 10 -Science-Biology-Chapter 8 :Heredity and Evolution

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Self Assessment-Class 10 -Science-Biology-Chapter 8 :Heredity and Evolution

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Very Short Answer -Class 10 -Science-Biology-Chapter 8 :Heredity and Evolution

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ASSERTION AND REASON

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ASSERTION AND REASON-Class 10 -Science-Biology

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CASE BASED QUESTIONS

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CASE BASED QUESTIONS-Class 10 -Science-Biology-

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PRACTICE TEST- 2-Class 10 -Science-Biology-Chapter 8 :Heredity and Evolution

Welcome to your Ncert - class 10- science - Chapter 8 – Heredity and Evolution2

Some green beetles appear among the red beetle because

Beetles become green by accumulating chlorophyll from the green leaves that they eat.

Beetles change colour from red to green with change of season

Red beetles mimic green colour of leaves whenever they see crows

Natural variations occur during sexual reproduction.

None

Which of the following is the reason for the appearance of new combinations of characters in the F2 progeny?

The tall/short and round/wrinkled seed traits are independently inherited

The tall/short and round/wrinkled seed traits are not independently inherited

None of these

The tall/short and round/wrinkled seed traits are linked

None

Which of the following statements about natural selection are correct?

(i) Natural selection tends to increase the characters that enhance survival and reproduction.

(ii) Individuals with better adaptive ability will produce more progeny.

(iii) Was considered as a mechanism of evolution by Darwin.

(i) and (iii) only

(i) and (ii) only

(i), (ii) and (iii)

(iii) only

None

Match the following lists and choose the correct option.

List I	List II
A. Genetic changes	1. Homologous organ
B. Independent inheritance	2. Fossil
C. Natural selection	3. Analogous organ
D. Dihybrid ratio	4. XY5. 9 : 3 : 3 : 1
E. Male human beings	5. 9 : 3 : 3 : 14
F. Wing of a bat and a wing of a bird	6. Darwin
G. Remnant of ancient animals	7. Mendel
H. Arm of a man and wing of a bird	8. DNA copying

A- 7, B- 8, C- 6, D- 5, E- 4, F- 3, G- 2, H- 1

A- 8, B- 7, C- 6, D- 5, E- 4, F- 2, G- 3, H- 1

A- 8, B- 6, C- 7, D- 5, E- 4, F- 3, G- 2, H- 1

A- 8, B- 7, C- 6, D- 5, E- 4, F- 3, G- 2, H- 1

None

A woman has only daughters. Which of the following is the suitable explanation for it?

The man produces sperms with either X and Y chromosomes and all are viable.

The man produces sperms with either X and Y chromosomes but only the sperms with Y chromosomes are viable.

The man produces sperms that have only X chromosomes and all are viable.

The man produces sperms with either X and Y chromosomes but only the sperms with X chromosomes are viable.

None

Experiment to prove that synthesis of organic compounds formed the basis of origin of life was performed by :

Fox

Haldane

Miller

Oparin

None

What are the differences between inherited and acquired characters?

Inherited characters - Characters that are passed on from offspring to parents. Acquired characters - Characters appearing in an individual's lifetime and can be transmitted to next generation.

Inherited characters - Characters appearing in an individual's lifetime but cannot be transmitted to next generation. Acquired characters - Characters that are passed on from parents to offspring.

Inherited characters - Characters appearing in an individual's lifetime and can be transmitted to next generation. Acquired characters - Characters appearing in an individual's lifetime but cannot be transmitted to next generation.

Inherited characters - Characters that are passed on from parents to offspring. Acquired characters - Characters appearing in an individual's lifetime but cannot be transmitted to next generation.

None

Speciation does not takes place due to ________.

Genetic variation

Mutation

Reduced gene flow

Geographic isolation

None

Study the following and select the correct statements.

(I) F1 progeny is the first hybrid generation and progeny resembled either of the parents.

(II) F2 progeny is a resultant hybrid generation of cross-pollination among F1 progeny and progeny showed both dwarf and tall plants.

(III) F2 progeny is a hybrid generation, produced by selfing F1 hybrids and progeny contained both dwarf and tall plants.

(IV) The proportion of probability of plants that dwarf was 1/4 that of the

F2 plants while 3/4th of the plants were tall.

I, II, III, IV

I, II, IV

I, III, IV

III, IV

None

10.

A cross between a tall pea plant and dwarf pea plant resulted tall progenies in F1 generation, because

Tallness is a recessive trait.

Dwarfness is a dominant trait.

Neither 'T' or 't' governs stem height.

Tallness is a dominant trait.

None

11.

With respect to the Darwin's theory of natural selection, which of the following is true for the organisms that are best suited to their environment?

Are most likely to survive and reproduce

Are most likely to live the longest

Are most likely to evolve

Are the fastest organisms

None

12.

According to the theory of acquired inheritance which one is correct?

If a man loses his hand, then his children will also be missing a hand.

Organisms are able to bring about a change in their phenotype.

All of the above

Changes in phenotype are passed on by way of the genotype to the next generation.

None

13.

If in a garden pea plant, a cross is made between red-flowered (RR) and white-flowered (rr) plants. What will be the phenotypic ratio in F2 generation?

1 : 3

3 : 1

1 : 2 : 1

9 : 3 : 3 : 1

None

14.

Two pea plants one with round green seeds (RRyy) and another with wrinkled yellow (rrYY) seeds produce

F1 progeny that have round, yellow (RrYy) seeds. When

F1plants are selfed, the F2 progeny will have a new combination of characters. Choose the new combination from the following.

(i) Round, yellow

(ii) Round, green

(iii) Wrinkled, yellow

(iv) Wrinkled, green

(i) and (iv)

(i) and (iii)

(i) and (ii)

(ii) and (iii)

None

15.

Which one of the following statements is incorrect?

Alleles are different forms of the same gene.

Alleles are non-heritable.

Alleles are present at the same locus.

Alleles code for different isoforms of a protein.

None

16.

Which of the following statements is/are correct?

Mendel's findings remained unknown until these were rediscovered.

None

Both

Mendel's experiments gave us the mechanism for the inheritance of traits from one generation to the next.

None

17.

In human beings, the statistical probability of getting either a male or a female child is 50:50. Which of the following is the cause behind it?

None of these

The ratio of male gametes containing X chromosome and those containing Y chromosome is 50:50.

The sex of an infant is determined by the type of sex chromosome contributed by the male gamete.

Both A and B.

None

18.

Select the incorrect statement.

The various forms of genes occupying a locus on homologous chromosomes are called alleles.

Locus is the position on chromosomes were genes are located.

During gamete formation, the alleles do not segregate, so that each gamete receives both the pair of alleles.

Each character of an individual is controlled by a unit factor.

None

19.

Choose the correct answer from the alternatives given.

In a certain plant, yellow fruit colour (Y) is dominant to green fruit colour (y) and round shape (R) is dominant to oval shape (r). The two genes involved are located on different chromosomes.
Which of the following is correct for the condition when plant YyRr is back crossed with the double recessive parent?

9 : 3: 3: 1 Ratio of Genotypes only

9:3:3:1 Ratio of Phenotypes only

1: 1: 1: 1 Ratio of Phenotypes and Genotypes

1: 1: 1: 1 Ratio of Phenotypes only

None

20.

'Feather was used for insulation in cold weather but later, they become useful for flight'. This statement describes:

Genetic variation

All of the above

Speciation

Evolution by stages

None

Time's up