Following are some of the characteristics of animals:
(i) Diets heavy on fruits (ii) White fur
(iii) Need to migrate (iv) Loud voice
(v) Sticky pads on feet (vi) Layer of fat under skin
(vii) Wide and large paws (viii) Bright colours
(ix) Strong tails (x) Long and large beak
For each characteristic indicate whether it is adaptation for tropical rainforests or polar regions. Do you think that some of these characteristics can be adapted for both regions?
(i) Diets heavy on fruits - Tropical
Due to the heavy rainfall and moderate temperature, the quality of the fruits is good. That's why the birds feeds on fruit.
(ii) White fur - Polar region
The organisms who lives in polar region have white furs which protects them from the extreme conditions of environment and protects them from the prey because they look like the snow.
(iii) Need to migrate - Polar region
This characteristic shown by the organisms that lives in the polar region. They migrate towards the lower region that contains moderate and average temperature from the excessive cold conditions for the survival.
(iv) Loud voice - Polar region and Tropical rainforest
This characteristic is shown by both the regions polar and tropical. This characteristic is used to call the mates and to capture the prey by showing the groupism attack.
(v) Sticky pads on feet - Polar region
Sticky pads are used by the polar region organisms. This characteristic is used to make the grip on the snow.
(vi) Layer of fat under skin - Polar region
This characteristic is adapted by the organisms which lives in the polar region. These organisms contains layer of fat under the skin to protect themselves form the excessive cold conditions.
(vii) Wide and large paws - Polar region
These characters are adapted in the polar regions by the organisms who lives there. They contain these charaters to make the grip and for the easy movement pattrens in the snow.
(viii) Bright colours - Tropical
These characteristics are adapted by the organisms that lives in the tropical rainforest which is also known as evergreen forest. Bright colours are shown by the organisms to attract the mates and the animal pollinators for proceeding the process of pollination.
(ix) Strong tails - Tropical
Strong tails are adapted in the tropical region by the organisms that lives there. Strong tails are used to capture the prey.
(x) Long and large beak - Tropical
This characteristic is adapted by the birds of tropical region. This characteristic helps the birds to feed on the hard shelles nuts and seeds or to capture the insects.
Fill in the blanks:
(i) The average weather taken over a long time is called ___________. (ii) A place receives very little rainfall and the temperature is high throughout the year, the climate of that place will be ___________ and ___________ .
(iii) The two regions of the earth with extreme climatic conditions are ___________ and __________.
Indicate the type of climate of the following areas:
(a) Jammu and Kashmir: _________________________________
(b) Kerala: ____________________________________________
(c) Rajasthan: __________________________________________
(d) North-east India: _____________________________________
A carnivore with stripes on its body moves very fast while catching its prey. It is likely to be found in
(i) polar regions (ii) deserts
(iii) oceans (iv) tropical rainforests
The tropical rainforest has a large population of animals. Explain why it is so.
Which of the two changes frequently, weather or climate?
Which features adapt polar bears to live in extremely cold climate?
(i) A white fur, fat below skin, keen sense of smell.
(ii) Thin skin, large eyes, a white fur.
(iii) A long tail, strong claws, white large paws.
(iv) White body, paws for swimming, gills for respiration.
Which option best describes a tropical region?
(i) hot and humid
(ii) moderate temperature, heavy rainfall
(iii) cold and humid
(iv) hot and dry
How do elephant living in the tropical rainforest adapt itself?
Name the elements that determine the weather of a place.
Explain, with examples, why we find animals of certain kind living in particular climatic conditions.
State similarities and differences between the laboratory thermometer and the clinical thermometer.
State differences between acids and bases.
Classify the changes involved in the following processes as physical or chemical changes:
(a) Photosynthesis
(b) Dissolving sugar in water
(c) Burning of coal
(d) Melting of wax
(e) Beating aluminium to make aluminium foil
(f ) Digestion of food
Fill the missing word in the blank spaces in the following statements:
(a) Wind is——————air.
(b) Winds are generated due to —————— heating on the earth.
(c) Near the earth’s surface __________air rises up whereas ___________ air comes down.
(d) Air moves from a region of ——— pressure to a region of ———.
In addition to the rock particles, the soil contains
(i) air and water
(ii) water and plants
(iii) minerals, organic matter, air and water
(iv) water, air and plants
Why does an athlete breathe faster and deeper than usual after finishing the race?
Match structures given in Column I with functions given in Column II.
Column I Column II
(i) Stomata (a) Absorption of water
(ii) Xylem (b) Transpiration
(iii) Root hairs (c) Transport of food
(iv) Phloem (d) Transport of water
(e) Synthesis of carbohydrates
Fill in the blanks:
(a) Production of new individuals from the vegetative part of parent is called_____________.
(b) A flower may have either male or female reproductive parts. Such a flower is called_____________.
(c) The transfer of pollen grains from the anther to the stigma of the same or of another flower of the same kind is known as _____________.
(d) The fusion of male and female gametes is termed as _____________.
(e) Seed dispersal takes place by means of _____________, _____________ and _____________.
Classify the following as motion along a straight line, circular or oscillatory motion:
(i) Motion of your hands while running.
(ii) Motion of a horse pulling a cart on a straight road.
(iii) Motion of a child in a merry-go-round.
(iv) Motion of a child on a see-saw.
(v) Motion of the hammer of an electric bell.
(vi) Motion of a train on a straight bridge.
Why do organisms need to take food?
There are ten tubewells in a lane of fifty houses. What could be the long term impact on the water table?
Choose the correct option from the following:
Plants take carbon dioxide from the atmosphere mainly through their:
(i) roots (ii) stem (iii) flowers (iv) leaves
An iron ball at 40°C is dropped in a mug containing water at 40°C. The heat will
(a) flow from iron ball to water.
(b) not flow from iron ball to water or from water to iron ball.
(c) flow from water to iron ball.
(d) increase the temperature of both.
How does the process of fertilisation take place in flowers?
Fill in the blanks:
(a) Production of new individuals from the vegetative part of parent is called_____________.
(b) A flower may have either male or female reproductive parts. Such a flower is called_____________.
(c) The transfer of pollen grains from the anther to the stigma of the same or of another flower of the same kind is known as _____________.
(d) The fusion of male and female gametes is termed as _____________.
(e) Seed dispersal takes place by means of _____________, _____________ and _____________.
Fill in the blanks:
(a) Longer line in the symbol for a cell represents its terminal .
(b) The combination of two or more cells is called a .
(c) When current is switched ‘on’ in a room heater, it .
(d) The safety device based on the heating effect of electric current is called a .
The rear view mirror of a car is a plane mirror. A driver is reversing his car at a speed of 2 m/s. The driver sees in his rear view mirror the
image of a truck parked behind his car. The speed at which the image of the truck appears to approach the driver will be
(i) 1 m/s (ii) 2 m/s
(iii) 4 m/s (iv) 8 m/s
In places of hot climate it is advised that the outer walls of houses be painted white. Explain.
Take three test-tubes. Fill æth of each with water. Label them A, B and C. Keep a snail in test-tube A, a water plant in test-tube B and in C, keep snail and plant both. Which test-tube would have the highest concentration of CO2?
Explain the factors responsible for the depletion of water table.