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

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Questions
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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