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Heredity and Evolution (Class X)

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Among the following, who is known as the Father of Genetics?

  1. Charles Robert Darwin

  2. Stanley L. Miller

  3. Gregor Johann Mendel

  4. J. B. S. Haldane

  5. Harold C. Urey


Correct Option: C
Explanation:

This is the correct option. Gregor Johann Mendel is known as the Father of Genetics.

Which of the following characteristics of the pea plant's transmission to progeny was not investigated by Mendel?

  1. Colour of flowers

  2. Colour of seeds

  3. Colour of leaves

  4. Length of stem

  5. Shape of seeds


Correct Option: C
Explanation:

This is the correct option as the colour of leaves of the pea plant's transmission to progeny was not investigated by Mendel.

Which of the following statements is/are false?

a. Heredity is the continuity of features from one generation to the next. b. Heredity information is present in the gametes of the parents. c. The male ovum fuses with the female sperm to form a zygote that gradually develops into an offspring.

  1. Only a

  2. Only a and b

  3. Only b

  4. Only b and c

  5. Only c


Correct Option: E
Explanation:

This is the correct option as this statement is false. The male sperm fuses with the female ovum to form a zygote that gradually develops into an offspring.

If the genotype of a person is IAIB, then which of the following will be his blood group?

  1. AB

  2. O

  3. B

  4. A

  5. None of these


Correct Option: A
Explanation:

This is the correct option. If the genotype of a person is IAIB, then AB will be his blood group.

A trait that is caused by a change in genes is called an inherited trait. Which of the following traits is not an inherited trait?

  1. Red curly hair

  2. Brown eyes

  3. Cleft chin

  4. Long thin nose

  5. Muscular body


Correct Option: E
Explanation:

This is the correct option. Muscular body is not an inherited trait. It is an acquired trait.

Which of the following statements is/are false?

a. Blonde hair is a phenotype produced by the genotype HH or Hh. b. The dihybrid cross is the inheritence of two pairs of contrasting characteristics of plants such as round-yellow seeds and wrinkled-green seeds. c. The male and female gamete carry one gene for each characteristic from the gene pairs of parents.

  1. Only a

  2. Only a and b

  3. Only b

  4. Only b and c

  5. Only c


Correct Option: A
Explanation:

This is the correct option as this statement is false. Blonde hair is a phenotype produced by the genotype hh.

Match the following:

 
a. Gene 1. It is the description of genes present in an organism.
b. Genotype 2. It is a unit of heridity that transfers characteristics from parents to their offsprings during reproduction.
c. Phenotype 3. It is the trait that is visible in an organism.
  1. a - 2, b - 1, c - 3

  2. a - 2, b - 3, c - 1

  3. a - 1, b - 3, c - 2

  4. a - 1, b - 2, c - 3

  5. a - 3, b - 1, c - 2


Correct Option: A
Explanation:

This is the correct option. Gene is a unit of heridity that transfers characteristics from parents to their offsprings during reproduction. Genotype is the description of genes present in an organism. Phenotype is the trait that is visible in an organism.

According to the studies, which of the following gases was not present in early Earth's atmosphere?

  1. Nitrogen

  2. Oxygen

  3. Ammonia

  4. Methane

  5. Carbon dioxide


Correct Option: B
Explanation:

This is the correct option. Oxygen was not present in early Earth's atmosphere.

Which of the following pairs of organs of animals is/are not homologous?

  1. Forelimbs of humans and lizards

  2. Forelimbs of frogs and lizards

  3. Forelimbs of humans and frogs

  4. Forelimbs of bats and butterfly

  5. None of these


Correct Option: D
Explanation:

This is the correct option. The forelimbs of bats and butterfly are not homologous organs as they have different basic design, though they are used for the same purpose.

Which of the following statements is/are false?

a. The wings of an insect and a bird are an example of analogous organs. b. The changes in the non-reproductive body cells of an organism can be inherited by its offsprings. c. Evolution is the sequence of gradual changes that take place in the primitive organisms over million of years in which new species are produced.

  1. Only a

  2. Only a and b

  3. Only b

  4. Only b and c

  5. Only c


Correct Option: C
Explanation:

This is the correct option as this statement is false. The changes in the non-reproductive body cells of an organism cannot be inherited by its offsprings.

Among the following scientists, who gave The Theory of Natural Selection'?

  1. J. B. S. Haldane

  2. Harold C. Urey

  3. Isaac Newton

  4. Stanley L. Miller

  5. Charles Robert Darwin


Correct Option: E
Explanation:

This is the correct option. Charles Robert Darwin gave The Theory of Natural Selection'.

In which of the following organisms, high incubation temperature leads to the development of female offsprings?

a. Snail b. Lizard c. Turtle

  1. Only a and c

  2. Only a and b

  3. Only b

  4. Only b and c

  5. Only c


Correct Option: E
Explanation:

This is the correct option. In turtles, high incubation temperature leads to the development of female offsprings.

Using the method of artificial selection, when some farmers wanted to grow large leaves of wild cabbage, they ended up producing which of the following?

  1. Kohlrabi

  2. Kale

  3. Broccoli

  4. Cauliflower

  5. Cabbage


Correct Option: B
Explanation:

This is the correct option. Using the method of artificial selection, when some farmers wanted to grow large leaves of wild cabbage, they ended up producing a leafy vegetable called kale.

Which of the following statements is/are false?

a. The process in which new species develop from the existing species is known as speciation. b. The gene that can decide the appearance of an organism only in the presence of another identical gene is called a recessive gene. c. If a sperm carrying X chromosomes fertilises an ovum carrying X chromosome, then the child born will be a boy.

  1. Only a

  2. Only a and b

  3. Only b

  4. Only b and c

  5. Only c


Correct Option: E
Explanation:

This is the correct option as this statement is false. If a sperm carrying X chromosomes fertilises an ovum carrying X chromosome, then the child born will be a girl.

Match the following:

 
Types of fossils Discription
a. Trilobites 1. They were the invertebrate animals that lived in sea about 180 million years ago.
b. Dinosaurs 2. They were carnivorous or herbivorous reptiles that were common between 65 to 250 million years ago.
c. Ammonites 3. They were marine arthropods that were common between 400 to 600 million years ago.
  1. a - 3, b - 1, c - 2

  2. a - 2, b - 1, c - 3

  3. a - 1, b - 2, c - 3

  4. a - 3, b - 2, c - 1

  5. a - 2, b - 3, c - 1


Correct Option: D
Explanation:

This is the correct option. Trilobites were marine arthropods that were common between 400 to 600 million years ago. Dinosaurs were carnivorous or herbivorous reptiles that were common between 65 to 250 million years ago. Ammonites were the invertebrate animals that lived in sea about 180 million years ago.

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