Science (Chapter-1-5)
Written
by : Mohammad Arif Mohiuddin
Phone : 01553516901
Chapter _ 1
Chapter _ 1
1) What are the two kinds of environment?
Ans: Biotic environment and abiotic
environment.
2) By which environment biotic environment is influenced?
Ans: Abiotic environment.
3) Which are the elements of abiotic environment?
Ans: The abiotic environment includes
hills, ponds, rivers, sea, towns and villages etc.
4) Which are the elements of biotic environment?
Ans: Plants, animals, birds,
micro-organisms etc.
5) Which influence the lives of animals and plants in many
ways?
Ans: The sunlight, air, water, heat, soil
etc. influence the lives of animals and plants in many ways.
6) Which cannot survive without air or water?
Ans: Plants and animals.
7) Which depend on each other?
Ans: Plants and animals.
8) Which contain green pigments?
Ans: Leaves of plants.
9) What is chlorophyll?
Ans: The leaves of plants contain green
pugments.These pigments are known as chlorophyll.
10)Which helps in food production of crops?
Ans: Chlorophyll
11)What is photosynthesis?
Ans: The process in which plants in
presence of light and water produce food with the help of chlorophyll is called
photosynthesis.
12)Why plants use foods?
Ans: Plants use foods for their survival.
13)What does the plants intake and release?
Ans: Plants intake carbon-di-oxide and
release oxygen.
14)What does the animals intake and release?
Ans: The animals intake oxygen and
release carbon-di-oxide.
15)All
animals release excreta.
16)The
pollination of plants is dependent upon insects, birds etc.
17)Plants
and animals are interdependent for survival.
18)Which is the source of energy?’
Ans: The sun
19)The
green plants produce food by the process of photosynthesis.
20)There
is immense need for conservation of plants and animals.
Chapter-2
21)What is
called environmental pollution?
Ans: we use environment in various various ways to survive in
this world. As a result the environment got changed. When these changes become
harmful for us we call them, “environmental pollution.”
22)What is
the impact of air pollution?
Ans: Air pollution has impact on the human health.
23)Pesticides are used in crops.
24) Why air becomes
polluted?
Ans: The air becomes polluted due to unplanned housing and
industry establishment, vehicle emission, smoke from brick fields etc.
25)By suing polluted
water people are exposed to water-borne disease.
26)Which
cause soil pollution?
Ans: Use of excess fertilizers and pesticides in the
agricultural land causes soil pollution.
27)Soil pollution causes
loss of productivity of soil.
28)Healthy environment
is necessary for the survival of human and living beings.
29)Who are
affected by various diseases?
Ans: Slum dwellers
30)Why the
conservation of forest is important?
Ans: To protect the environment.
31)Why mass
public awareness should be created?
Ans: Mass public awareness should be created to conserve
environment.
Chapter-3
32)We cannot live
without water.
33)How
plants get water and nutrition?
Ans: Plants get water and nutrition from soil.
34)Which is
used as a median for digestion?
Ans: When we eat food,water is used as a median for digestion
35)Water is essential to
maintain the proper temperature of our body.
36)Water is obtained
from different sources.
37)What is
hail?
Ans: When the water particles in the cloud become extremely
cold, the particles turn into ice and falls down on earth as hails.
38)Rain water flows on
over the soil and mixes with river water.
39)River water flows on
and falls into the sea water.
40)Water moves on earth
from one source to another source in cycles.
41)How water
vapour reach to the mountain peaks?
Ans: Water vapour reach to the mountain peaks as clouds.
42)Why in
summer the ice melts?
Ans: In summer the ice melts into water due to the heat of the
sun.
43)What is
called water cycle?
Ans: The cyclic order in which water returns back is called a
water cycle.
44) Which colour is used to mark the tube well
with arsenic?
Ans: red colour
45)There is mineral of
Arsenic down in the earth.
46)Which
diseases are occurred due to polluted water?
Ans: Cholera,dysentery,typhoid and diarrhea.
47)What is
called arsenicosis?
Ans: Drinking of Arsenic polluted water for a long time causes a
kind of disease or scar in the hands and legs called arsenicosis.
48)We need to drink and
use safe water for a healthy living.
49)Water needs to be
boiled to make it fully free from germs.
50)What is
sedimentation?
Ans: The process of separating clean water from river’s or
pond’s water is called sedimentation.
Chapter-4
51)Air surrounds us
from all sides.
52)What is called
atmosphere?
Ans: The air that
surrounds us is called atmosphere.
53)Air is an important
element of environment.
54)What contain air?
Ans: Air contains
nitrogen, oxygen, carbon di oxide and water vapours.
55)Which gas breaks
down the foods we eat?
Ans: Oxygen breaks
down the foods we eat and creates energy.
56)Which keeps our body
warm?
Ans: Energy keeps
our body warm.
57)Fish lives on taking
oxygen from the air contained in water.
58)We cannot make fire
without oxygen.
59)How we cook our
foods?
Ans: We cook our
foods and boil water using fire.
60)What is it in the
wheels of bicycles, rickshaws and cars?
Ans: There is air in
the wheels of bicycles, rickshaws and cars.
61)Patients with
breathing problems are given oxygen from cylinders.
62)There is less oxygen
on peaks of mountain.
63)Which is used to
produce urea?
Ans: Nitrogen of air
is used to produce urea.
64) Which gas is used
to preserve food?
Ans: Nitrogen
65)Carbon dioxide is
mixed under high pressure with soft drink of the bottle.This gives a sharp
taste.
66)Carbon-di-oxide is
heavier than air.
67)The airflow of air
is used to rotate big wheels or turbines to generate electricity.
68)Which absorbs heat?
Ans: Flow of air
69)Air is very useful
to us.
70)What is called air
pollution?
Ans: The change in
the natural composition of air is called air pollution.
71)A hearth or a cooker
is another source of producing carbon monoxide.
72)How air becomes
polluted?
Ans: Air becomes
polluted if carbon dioxide increases in the air.
73)Which are the
reasons behind the increasing of carbon-di-oxide?
Ans: The burning of
coal, petroleum and natural gas is the reason of carbon di-oxide in the air.
74)When coal is burnt
what is produced?
Ans: Sulphur
di-oxide
75)When a patient of
tuberculosis or pox sneezes or coughs he also spreads germs into the air and
pollutes it.
Chapter- 5
76)Which is
the cause or agent of changes?
Ans: Energy
77)Which are
the two important concepts for describing natural events?
Ans: Two concepts: matter and energy.
78)What is
matter?
Ans: The thing which cover space and which has weight and occupy
a space is called a matter.
79)Heat, light, sound,
electricity all these has no weights.
80)Matter may be of
different forms and may have different states.
81)Which
cannot be created or destroyed?
Ans: Energy
82)Energy is changes
only from one state to another.
83)Why
energy is applied to a body?
Ans: Energy is applied on a body to increase its speed or
temperature.
84)What is
called energy?
Ans: The capacity to do work is called energy.
85)Energy has different
forms and different forms.
86)From
where we get heat and light?
Ans: From sun
87)What is
solar energy?
Ans: The energy which we get from the sunlight is called solar
energy.
88)Which is
an important energy in modern civilization?
Ans: Electricity
89)Sound is a kind of
energy.
90)Industries use
electric motors to do different works.
91)How we
listen to music?
Ans: We listen to music through sound energy.
92)The current of water
is used to generate electricity.
93)When coal or wood is
burnt to produce heat,chemical energy transforms into heat energy.
94)The heat energy
transform into kinetic energy.
95)What is
called nuclear energy?
Ans: the energy which sun creates is called nuclear energy.
96)Heat is transferred
from a high temperature zone to low temperature zone in three process.Such as:
conduction,convection and radiation
97)How light
is transmitted?
Ans: Light is transmitted through radiation.
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