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CBSE Class 10 Science Quiz | CBSE Class 10 Science MCQs & Answers

81 The main function of the plant hormone called abscisic acid is to:
[A] Increase the length of cells
[B] Promote cell division
[C] Inhibit growth
[D] Promote growth of stem and roots
Answer: Inhibit growth
82 A big tree falls in a forest, but its roots are still in contact with the soil. The branches of this fallen tree grow straight up (vertically). This happens in response to:
[A] Gravity and water
[B] Light and gravity
[C] Water and light
[D] Water and minerals
Answer: Light and gravity

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83 The movement of a plant part in response to the force of attraction exerted by the earth is called:
[A] Geotropism
[B] Phototropism
[C] Hydrotropism
[D] Chemotropism
Answer: Geotropism
84 The ratio of number of chromosomes in a human zygote and a human sperm is:
[A] 2 : 1
[B] 3 : 1
[C] 1 : 3
[D] 1 : 2
Answer: 2 : 1
85 Which out of the following processes does not lead to the formation of clones:
[A] Fragmentation
[B] Fission
[C] Fertilisation
[D] Tissue culture
Answer: Fertilisation
86 The figure given alongside shows the human male reproductive organs. Which structures make sperms and seminal fluid?
[A] Y makes sperms and V makes seminal fluid
[B] X makes sperms and W makes seminal fluid
[C] V makes sperms and X makes seminal fluid
[D] W makes sperms and Y makes seminal fluid
Answer: Y makes sperms and V makes seminal fluid
87 The number of chromosomes in both parents and offsprings of a particular species remains constant because:
[A] Chromosomes get halved after gamete formation
[B] Chromosomes get halved during gamete formation
[C] Chromosomes get doubled after zygote formation
[D] Chromosomes get doubled after gamete formation
Answer: Chromosomes get halved during gamete formation
88 The number of chromosomes in parents and offsprings of a particular species remains constant due to:
[A] Halving of chromosomes after gamete formation
[B] Doubling of chromosomes after zygote formation
[C] Doubling of chromosomes after gamete formation
[D] Halving of chromosomes during gamete formation
Answer: Halving of chromosomes during gamete formation
89 The asexual reproduction in the Spirogyra involves:
[A] Division of a cell into many cells
[B] Formation of a large number of buds
[C] Division of a cell into two cells
[D] Breaking up of filaments into smaller bits
Answer: Division of a cell into many cells
90 Which among the following is a unicellular organism that reproduces by budding:
[A] Spirogyra
[B] Yeast
[C] Hydra
[D] Planaria
Answer: Spirogyra
91 The process of the division of cell into several cells during reproduction in Plasmodium is termed as:
[A] Multiple fission
[B] Binary fission
[C] Fragmentation
[D] Budding
Answer: Multiple fission
92 Which of the following pair of organ is not homologous?
[A] Wings in butterfly and bat
[B] Forelimbs in lizard and frog
[C] Forelimbs in humans and lizard
[D] None of these
Answer: Wings in butterfly and bat
93 The organs present in two organisms indicate that they are derived from the same ancestor are:
[A] Homologous Organs
[B] Sense organs
[C] Analogous Organs
[D] Respiratory Organs
Answer: Homologous Organs
94 What is the ancient name for all human beings?
[A] Homo sapiens
[B] Invertebrates
[C] Monkey
[D] Chimpanzee
Answer: Homo sapiens
95 What could be the reason for the fossil of an organism to be found in the deeper layers of the earth?
[A] The extinction of organism has occurred thousands of years ago
[B] Time of extinction cannot be determined.
[C] The extinction of organism has occurred few years back
[D] The position of fossil in the layers of earth is not related to its time of extinction
Answer: The extinction of organism has occurred thousands of years ago
96 Which is the one characteristic of the parents that can be inherited by their children?
[A] Snub nose
[B] Cut nose
[C] Deep scar on chin
[D] Technique of swimming
Answer: Snub nose
97 Which of the following determines the sex of a child?
[A] The presence of a Y chromosome in a sperm
[B] The presence of an X chromosome in an ovum
[C] The length of the mother’s pregnancy
[D] The length of time between ovulation and copulation
Answer: The presence of a Y chromosome in a sperm
98 A cross between a tall plant (TT) and short plant (tt) resulted in progeny that were all tall plants as:
[A] Tallness is the recessive trait
[B] Tallness is the dominant trait
[C] Shortness is the dominant trait
[D] Height of plant is not governed by gene t or t
Answer: Tallness is the dominant trait
99 In the human blood grouping, the four basic blood types are type A, type B, type AB, and type O. They are:
[A] Simple dominant and recessive traits
[B] Co-dominant traits
[C] Recessive traits
[D] Inherited traits
Answer: Co-dominant traits
100 The sequence of gradual changes which takes place in the primitive organisms over millions of years in which new species are produced is known as
[A] Inheritance
[B] Evolution
[C] Heredity
[D] Generation
Answer: Evolution

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