Friday, January 31, 2020
VI - Mathematics worksheets (Yearly Exam)
Ratio Proportion and Unitary Method
https://drive.google.com/file/d/1KgErum6jCLEmSuBTdEYEHJQEWMN23hqI/view
Perimeter and Area
https://drive.google.com/file/d/1xbA0bo3y8vJA2WM9S7-ieAOQ7LimhE1s/view
Geometrical Constructions
https://drive.google.com/file/d/14AuRCCiJIXsklMDT6d7Y-K6xbqXJHysT/view
Symmetry
https://drive.google.com/file/d/15lG0QmOaBjg1ATG2UYdspfhDn23g1FME/view
https://drive.google.com/file/d/1KgErum6jCLEmSuBTdEYEHJQEWMN23hqI/view
Perimeter and Area
https://drive.google.com/file/d/1xbA0bo3y8vJA2WM9S7-ieAOQ7LimhE1s/view
Geometrical Constructions
https://drive.google.com/file/d/14AuRCCiJIXsklMDT6d7Y-K6xbqXJHysT/view
Symmetry
https://drive.google.com/file/d/15lG0QmOaBjg1ATG2UYdspfhDn23g1FME/view
Wednesday, January 29, 2020
SCIENCE- STD6- MAGICAL MAGNETS EXTRA QUESTIONS
EXTRA QUESTIONS
1)
DEFINE THE FOLLOWING:
a)
Magnets
b)
Magnetism
c)
Magnetic Poles
d)
Magnetite
e)
Magnetic Keepers
2)
What are the differences between magnetic and
non-magnetic materials?
Give two examples of each.
3)
What are the different ways of preserving magnets?
4)
How was magnetite used for pilots and sailors?
5)
Describe different properties of the magnets.
6)
What is the principle on which magnetic compass
works?
7)
How can we find out near which end is North Pole
located in a bar magnet?
8)
Classify the following objects as magnetic and
non-magnetic:
Iron, Rubber, Glass, Mirror, Cobalt,
Nickel, plastic
9)
How can you make an iron strip into a magnet?
10)
What would happen if you tie a thread in the
middle of the magnet and suspend it freely from a stand?
11)
What are Electromagnets? What is one of its most
popular uses?
12)
Name any five electrical appliances in which
magnets are used?
Friday, January 24, 2020
STD 6- SCIENCE- WATER IS LIFE- NOTES
Water is Life
1 Explain
how drought causes extensive damage to
human life and property?
ANS:
1.
Droughts results in dying up of the crops and vegetation.
2.
Its leads to scarcity of food and fodder for humans and
animal life respectively.
3.
Its leads to malnutrition in human and animals.
2. Explain how ground water is recharged?
ANS: Trees help in recharging the ground
water supply. The roots of the tree grow and spread in the soil. This helps in
creating open spaces in the soil. The rainwater and water from other sources
such as rivers and ponds seeps through the soil and fills the empty spaces and
cracks deep below the ground. By this process groundwater gets recharged.
3.Explain the factors responsible for the
depletion of water table?
ANS:
1.
Increase in population
2.
Increase in agriculture activities,
3.
Rapid Urbanization,
4.
Deforestation,
5.
Mismanagement of water resources
4.
When does a drought occur?
ANS: When there is
insufficient or no rainfall occurs for more than a year in a region, the
scarcity of water happens. Ponds and wells dry up. The soil continues to lose
water due to evaporation and transpiration and eventually dry. This leads to
drought.
5. Why is there a need for conserving
water? Give two reasons.
ANS: 1. Increasing population
need more water.
2. Availability of water is decreasing day-by-day.
6.
What
is rainwater harvesting? What are the two rainwater harvesting techniques?
ANS:
Collecting rain water and storing it for later use is called rainwater
harvesting. The two techniques of harvesting are:
1.
Rooftop rainwater harvesting.
2.
Allowing water into ground directly
through roadsides drains.
7.
How are clouds formed?
ANS: Clouds are formed due to process
of evaporation and condensation when air
moves up, it gets cooler and cooler. At sufficient height the air become so
cool that water vapours present in the air condense. They form tiny droplets and float in air as
clouds.
Q2. Define the following
|
1.
Freezing
2.
Melting
3.
Evaporation
4.
Condensation
5.
Precipitation
|
6.
Groundwater
7.
Flood
8.
Drought
9.
Rainwater
harvesting
10.
Hail
|
STD 6- SCIENCE- LIFE CAN ADAPT- NOTES
LIFE CAN ADAPT
Q.1. Define :
1.
Habitat 2. Adaptation 3. Succulents 4. Halophytes 5. Mesophytes
Q.2. Give reasons :
a. Speed is important for certain animals to survive
in grasslands.
Ans.
Speed is important for certain animals to survive in grasslands in order to
escape from predators.
b. Desert animals like
rat , snakes , etc. dig burrows.
Ans.
The burrows protect them from heat and loss of water from their body.
c. Leaves of mountain region trees are needle like.
Ans.
Leaves of mountain region trees are
needle like to slide off easily the rain water and snow.
d. Lion has :
i. rusty colour
ii. eyesinfront of face
iii. strong claws
Ans.
i.
Rusty brown colour—to hide in grasslands.
ii.
Eyes infront—to locate its prey.
iii. Strong
claws--- to creep up to its prey without
making sound while hunting.
e. Deer has
i. eyes located on side
ii. strong teeth
Ans.
i. .eyes located on side—to look in all directions for danger.
ii.
strong teeth—for chewing hard plants stems of the forest.
f. Roots of aquatic
plants are absent or poorly developed.
Ans.
Due to abundant water absorbed directly by plants, the roots of aquatic plants
become less significant .Therefore, these are either absent or poorly
developed.
Q.3. Q/A-----
1. Name the body part
that help frog –
a. to swim in water
b. catch prey
Ans.
a. Webbed feet
b.
Strong back legs
2. How are desert
plants adapted in desert?
Ans. The following features help the desert plants to
survive in desert---
· Leaves
modified to spines to prevent water loss.
· Stems
carry out photosynthesis.
· Stems
are also covered with thick waxy layer to retain water.
· Extensive
root system so as to go very deep into the soil to absorb water.
3. List the features of
plants in grasslands.
Ans.
The features of plants are ----
· The
grasses growing here have flexible stalks so that they bend and do not break in
windy conditions.
· They
have strong roots to anchor the grass and small leaves to reduce loss of water.
· Trees
growing here are also small with small leaves and the roots go deep into the
soil in search of water.
4. List the features
possessed by animals living on mountains.
Ans.i.
These animals have thick skin or fur to protect them from cold.
ii.
They also have a thick layer of fat beneath their skin for insulation against
cold.
iii. Some
animals like mountain goats has long hair to keep it warm and strong hooves for
running up the rocky slopes of the mountains.
5.
How do dolphins and whales breathe?
Ans. Aquatic animals like
dolphins and whales do not have gills. They breathe in air through nostrils or
blowholes that are located on upper parts of their heads. They can stay inside
water for a long time without breathing. They come out time to time to breathe
in air.
6. What makes aquatic plant float?
Ans.
Aquatic plants can float because of the following features—
i.
Their stems are long, slender,
weak, spongy ( Have air spaces) and flexible. This reduces the weight of plants
and thus help them in floating. Eg. In Nelumbo.
ii.
In some plants like Lemna, leaves are flat, broad and
covered with waxy coating to repel water.
iii.
In submerged plants, all parts grow
underwater. They have narrow and thin ribbon like leaves which can bend in
flowing water.
7.
Why camel is called ship of desert?
Ans. Camel is called as ship of desert because of
its following features---
DRAW DIAGRAM (PG. NO. 103) FROM
TEXTBOOK.
Q.4. Differences between ----
i. Xerophytes and hydrophytes
Ans.
ii.
Floating plants and submerged plants---
|
Floating
plants
|
Submerged
plants
|
|
1.These
plants floats freely on water
|
1.
These plants are submerged in water.
|
|
2.
Their leaves are flat and broad.
|
2.
Their leaves are thin and ribbon like.
|
|
3. Eg. Lemna, Wolffia, etc.
|
3. Eg. Hydrilla, Vallisneria, etc.
|
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