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Free download in PDF CBSE Class 7 Science MCQs with Answers. Here Gkseries provide Science Solve Questions and Answers for CBSE Class 7 Students.
101
Insects have several openings on lateral sides of their bodies which lead to air tubes. These openings are called
[A]
tracheae
[B]
spiracles
[C]
lungs
[D]
gills
102
During Inspiration or Inhalation, inside lungs
[A]
volume decreases pressure increases
[B]
volume increases pressure decreases
[C]
volume decreases pressure decreases
[D]
volume increases pressure increases
Answer: volume increases pressure decreases
103
In earthworm, the exchange of gases occurs through ________.
[A]
moist skin
[B]
lungs
[C]
gills
[D]
tracheae
104
Plants breathe through tiny pores in the leaves called ________.
[A]
stomata
[B]
pores
[C]
leaf blade
[D]
trachea
105
Organisms which respire in absence of air are called _________.
[A]
microbes
[B]
anaerobes
[C]
aerobes
[D]
none of these
106
Breathing is a ________ process while respiration is a _______ process.
[A]
physical, chemical
[B]
chemical, physical
[C]
physical, physical
[D]
chemical, chemical
Answer: physical, chemical
107
What is the heart rate of a normal adult human?
[A]
90-120 times per minute
[B]
70-80 times per minute
[C]
40-50 times per minute
[D]
10-20 times per minute
Answer: 70-80 times per minute
108
Phloem helps in the transport of _________ in plants.
[A]
food
[B]
water
[C]
minerals
[D]
carbon dioxide
109
Vascular tissues that transport water and nutrients in plants are called _________.
[A]
Veins
[B]
Phloem
[C]
Xylem
[D]
Root Hairs
110
The major excretory product in humans is ________
[A]
uric acid
[B]
ammonia
[C]
feaces
[D]
urea
111
Name the scientist who discovered blood circulation?
[A]
William Harvey
[B]
Isaac Newton
[C]
Christiaan Barnard
[D]
William Thomson
112
The filtering of blood through an artificial kidney is called ________
[A]
dialysis
[B]
diffusion
[C]
circulation
[D]
transportation
113
Upper chambers of a human heart are called?
[A]
atria
[B]
ventricles
[C]
pulmunory vein
[D]
vena cava
114
Which component of blood in mammals build up defense against harmful germs enter in the body?
[A]
WBCs
[B]
Platelets
[C]
RBCs
[D]
Plasma
115
The fluid part of the blood is called _______
[A]
Plasma
[B]
Haemoglobin
[C]
RBCs
[D]
WBCs
116
Name the pigment which gives red colour to the blood in mammals.
[A]
Haemoglobin
[B]
Globulin
[C]
Plasma
[D]
Platelets
117
The meter that is used to measure the distance moved by the vehicle is known as _____
[A]
Speedometer
[B]
Odometer
[C]
Chronometer
[D]
Ammeter
118
Which of the following is a scalar quantity?
[A]
Distance
[B]
Displacement
[C]
Velocity
[D]
Force
119
Which of the following relations is correct?
[A]
Speed = Distance × Time
[B]
Speed = Distance ÷ Time
[C]
Speed = Time ÷ Distance
[D]
Speed = 1/(Distance × Time)
Answer: Speed = Distance ÷ Time
120
The metallic ball in a pendulum is called as _______
[A]
Bob
[B]
Rod
[C]
Gong
[D]
Fork
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