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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
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
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
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
85
Which out of the following processes does not lead to the formation of clones:
[A]
Fragmentation
[B]
Fission
[C]
Fertilisation
[D]
Tissue culture
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
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
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
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
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
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