The DAV Class 7 Science Solutions and DAV Class 7 Science Chapter 13 Question Answer – Weather, Climate and Adaptation of Animals are essential study tools for DAV public school students in Class 7.
DAV Class 7 Science Ch 13 Question Answer – Weather, Climate and Adaptation of Animals
DAV Class 7 Science Ch 12 Solutions – Weather, Climate and Adaptation of Animals
Something To Know
A. Fill in the blanks.
Quiestion 1.
A common measure of humidity used very often, is known as ________
Answer:
Relative humidity
Quiestion 2.
________, ________, ________ and ________ are forms of precipitation.
Answer:
Rain, drizzle, snowfall and hail
Quiestion 3.
________ are formed when water vapour in air condenses to liquid droplets or ice crystals.
Answer:
Precipitation
Quiestion 4.
The average weather of a place taken over a period of 20 – 25 years, will specify its ________
Answer:
Climate
Quiestion 5.
Rajasthan falls in ________ climatic zone.
Answer:
Arid
Quiestion 6.
Penguins are different from other birds as they don’t have ________
Answer:
air spaces in their bones.
B. Match the following:
| Column A | Column B |
| 1. Humidity | (a) Prehensile tail |
| 2. Sub-tropical | (b) Equator |
| 3. Tropical rainforest | (c) Hot and wet summer |
| 4. Red eyed frog | (d) Water vapour |
| 5. Monkey | (e) Sucker pads |
Answer:
| Column A | Column B | |
| 1. Humidity | d | (a) Prehensile tail |
| 2. Sub-tropical | c | (b) Equator |
| 3. Tropical rainforest | b | (c) Hot and wet summer |
| 4. Red eyed frog | e | (d) Water vapour |
| 5. Monkey | a | (e) Sucker pads |
C. Tick (✓) the correct option.
1. Which of the following is not an element used for describing weather
(a) Wind
(b) Temperature
(c) Humidity
(d) Mountain
Answer:
(d) Mountain
2. An organism with fur on its body and a layer of fat (blubber) under the skin is likely to be found in—
(a) Tropical rainforest
(b) Desert
(c) Subtropical region
(d) Polar region
Answer:
(d) Polar region
3. Which features best describe a tropical region?
(a) Hot and humid
(b) Moderate temperate, heavy rainfall
(c) Cold and humid
(d) Hot and diy
Answer:
(a) Hot and humid
4. An animal generally found in the tropical rain forests is the—
(a) Penguin
(b) Reindeer
(c) Lion-tailed macaque
(d) Polar bear
Answer:
(c) Lion-tailed macaque
5. Lion-tailed macaque gets its name from
(a) its ‘Roar’ like lion
(b) Colour of the fur
(c) Tassel at the end of its tail
(d) its eating habits
Answer:
(c) Tassel at the end of its tail
D. Answer the following questions in brief.
Question 1.
List the main elements that determine the weather of a place.
Answer:
Following elements determine the weather of a place: temperature, humidity, cloudiness, precipitation, wind and atmospheric pressure.
Question 2.
When are the maximum and minimum temperatures likely to occur during the day?
Answer:
During a day, the maximum temperature is during mid-afternoon and the minimum temperature is during early morning.
Question 3.
How can forecast, about a ‘clear sky’, or an ‘approaching storm’ be made by measuring the atmospheric pressure of a given region?
Answer:
Atmospheric pressure gives a good indication of oncoming weather. If atmospheric pressure is normal, it shows a calm day ahead. If atmospheric pressure is low, it indicates towards an oncoming storm.
Question 4.
Name the major climatic zones of India. Also mention the names of two states each, that fall in these zones.
Answer:
| Major climatic zones and States in India | |
| Climatic zones | States |
| Alpine zone | Jammu & Kashmir, Himachal Pradesh |
| Sub-tropical zone | Uttar Pradesh, Madhya Pradesh |
| Tropical | West Bengal, Maharashtra |
| Arid | Rajasthan, Gujarat |
Question 5.
Mention two adaptive features of a penguin that help it in swimming.
Answer:
Streamlined body and paddle like feet help a penguin in swimming.
Question 6.
State the function of sucker pads on the feet of red-eyed frogs.
Answer:
Sucker pads on the feet of red-eyed frogs help in climbing on tree.
E. Differentiate between:
Question 1.
Differentiate between
(a) Weather and climate
(b) Climate in polar regions and in tropical rain forests
Answer:
(a) Weather is a short term phenomenon, while climate is a long term phenomenon.Weather is taken for a particular time, while climate is taken for at least 20 – 25 years.
(b) The climate in polar regions is extremely cold and rainfall is scanty, while the climate in tropical rainforests is moderately hot with plenty of rainfall.
Question 2.
What is adaptation? Give one example each of behavioural and structural adaptations.
Answer:
Adaptation: This is an ability of an animal which makes it suited to its environment. Some examples of adaptation are as follows:
Behavioural Adaptation: Moving in large groups is an example of behavioural adaptation. This helps in protecting the members of the group from predators. Structural Adaptation: Polar bear has a thick coat of fur; which is an example of structural adaptation.
Question 3.
Mention any four adaptations that have helped the polar bear to survive in the Polar Region.
Answer:
Four adaptations of polar bear are as follows:
- Thick coat of fur,
- White fur,
- Thick layer of fat under the skin
- Well developed sense of smell
Question 4.
Give reasons
(a) Big cats have sharp teeth.
Answer:
Sharp teeth help in tearing the flesh.
(b) Some monkeys have long prehensile tails.
Answer:
Monkeys use their tail to hang on to a branch.
(c) Penguins do not have air spaces in their bones.
Answer:
Lack of air space helps the penguin in sinking in water.
Question 5.
The tropical rainforest has a large population of animals.’ Explain why is it so? Answer: Tropical region has thick vegetation. This ensures plenty of food for a variety of
animals. Due to this, tropical rainforest has a large population of animals.
Question 6.
How is the trunk useful to the elephant?
Answer:
The trunk is very useful to the elephant. An elephant can uproot a tree with its trunk. It uses its trunk to drink water and to sprinkle water all over its body. It has a well developed sense of smell which helps it in finding food and water.
Value Based Question
Neha had to change her school several times because of the transfer of her parents. However, being a multi-talented and friendly girl, having a positive attitude, she was always able to adjust, and adapt, herself to her new surroundings and envi¬ronment. Her mother would often say that Neha’s adaptive nature was similar to the adaptation shown by animals as per their environment.
Question 1.
State any two values that, you think, Neha must have always upheld.
Answer:
Friendly nature and an urge to explore the new world
Question 2.
Give two examples to show the ability of animals to adapt themselves to their environment and surroundings.
Answer:
Polar bears can survive in extremely cold conditions. Camels can survive in extremely hot and dry conditions.
Something To Do
Question 1.
Make your own ‘Weather Scrap Book’.
Collect cuttings from newspapers and magazines relating to the weather. You could use information such as weather charts to show that the weather changes over several days or weeks. How many different symbols are used on weather charts? Can you invent your own symbols?
You could also find other weather-related stories in newspaper, for example about recent storms or natural disasters. What meteorological events do the articles mention? Do some particular areas of the world seem to be more affected by bad weather than others? Which areas are they and can you think why this might be so?
Answer:
Do it yourself.
Question 2.
We can measure changes in air pressure by making a barometer using a few simple pieces of equipment.
You will need:
- A jam or straight-sided glass.
- A long-necked bottle.
- Water mixed with food colouring.
- A marker pen.
Place the bottle upside down in the jar so that it is resting on the rim. The top of the bottle should be just above the bottom of the jar. Remove the bottle and pour some coloured water into the jar. Your should use enough water so that it just covers the neck of the bottle when it is in place.
On the side of the jar, use the marker pen to mark the current level of water in the bottle. Put your barometer in a place where the temperature is fairly constant. Mark any changes in the water level over the next few weeks on the side of the jar. When the water is high in the bottle, air pressure is high and the weather should stay fine. When the water is low in the bottle, air pressure is low and its will be stormy.
Answer:
Do it yourself.
DAV Class 7 Science Chapter 12 Solutions – Weather, Climate and Adaptation of Animals
I. Fill in the blanks.
Question 1.
________ tells about the climatic condition at a particular time and place.
Answer:
Weather
Question 2.
________ tells about the climatic condition for a very long period.
Answer:
Climate
Question 3.
Temperature is lowest during ________ in a day.
Answer:
Early morning
Question 4.
Penguin is well adapted to live in ________
Answer:
Polar region
Question 5.
Macaque monkey has ________ at the end of its tail.
Answer:
Tassel
Question 6.
Tropical rainforests have
(a) Poor rainfall
(b) Millions of plants and animal species
(c) Poor soils
(d) Temperature ranging from 35 – 40° C.
Answer:
(b) Millions of plants and animal species
II. Tick (✓) the correct option.
1. Which of these animals is adapted to live in the hot desert?
(a) Monkey
(b) Lion
(c) Deer
(d) Camel
Answer:
(d) Camel
2. Which of these states come in the Alpine climate region?
(a) Maharashtra
(b) Gujarat
(c) Jammu & Kashmir
(d) Bihar
Answer:
(c) Jammu & Kashmir
3. Which of these climates get very little rainfall?
(a) Arid
(b) Tropical
(c) Sub-tropical
(d) All of these
Answer:
(a) Arid
4. Which state of India forms the major portion of its arid region?
(a) Gujarat
(b) Rajasthan
(c) Haryana
(d) Punjab
Answer:
(b) Rajasthan
5. The air pressure would be highest in which of these cities?
(a) Chennai
(b) Delhi
(c) Lucknow
(d) Dehradun
Answer:
(a) Chennai
III. Answer the following questions.
Question 1.
Define weather.
Answer:
The state of atmosphere at a particular time and place with respect to the various elements of weather is called weather.
Question 2.
What is climate?
Answer:
The average weather in a particular region over a long period of time is called climate.
Question 3.
Which are the various climatic regions in India? Explain briefly.
Answer:
Climate of India: Climate of India can be divided into four climatic zones, viz. Alpine, Sub-tropical, Tropical and Arid.
(a) Alpine Zone: This climate is present at the high altitudes of the Himalayas. This area is snow capped throughout the year.
(b) Sub-tropical: This zone is present in a major part of northern India. Summers are hot and wet, while winters are cold and dry.
(c) Topical: This climate zone can be divided into two parts; Tropical Wet and Tropical Dry monsoon. In Tropical Wet climate, temperature is average and rainfall is high. In Tropical Dry climate, rainfall is scarce.
(d) Arid: This climate zone has high temperature and low rainfall. This type of climate is present in the western part of the country. The temperature in this zone may go up to 50°C.
Question 4.
Write a short note on adaptations in penguin.
Answer:
Penguin is another animal which is well adapted to polar region. Feathers of penguin are densely packed and thus provide protection against cold. The bones of penguin do not have air spaces. It helps them to sink in water. A layer of fat (blubber) is present beneath the skin. Streamlined body and paddle-like feet help it in swimming.
IV. Projects
Question 1.
On a map of India, mark various climatic regions.
Answer:
Do it yourself.
Question 2.
Under which climatic zone, does your state come? Make a report on the climate of your state.
Answer:
Do it yourself.