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Free download in PDF CBSE Class 10 Science MCQs & Answers. Here Gkseries provide Science Solve Questions and Answers for CBSE Class 10 Students.
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
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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
View Answer
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
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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
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85
Which out of the following processes does not lead to the formation of clones:
A
Fragmentation
B
Fission
C
Fertilisation
D
Tissue culture
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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
View Answer
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
View Answer
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
View Answer
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
View Answer
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
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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
View Answer
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
View Answer
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
View Answer
Answer: Homologous Organs
94
What is the ancient name for all human beings?
A
Homo sapiens
B
Invertebrates
C
Monkey
D
Chimpanzee
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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
View Answer
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
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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
View Answer
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
View Answer
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
View Answer
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
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