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CBSE Questions for Class 7 Biology Weather Climate And Adaptations Of Animals To Climate Quiz 2 - MCQExams.com
CBSE
Class 7 Biology
Weather Climate And Adaptations Of Animals To Climate
Quiz 2
How is oxygen replenished in nature?
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Photosynthesis
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Transpiration
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Respiration
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Evaporation
Travelling long distances to avoid winter is called:
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Migration
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Adaptation
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Hibernation
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Aestivation
Explanation
$$\textbf{Correct option:}$$ A
$$\textbf{Solution:}$$
$$\textbf{Option (A):}$$ Migration
$$\bullet$$ Migration is the periodic change of place or position of a certain "species population" with purpose. Migration could be seasonal (due to change in season), annual (on a particular day of the year), lunar ( due to the position of the moon), and altitudinal (because of height). Example: Birds like geese fly south for winter.
$$\bullet$$ Conditions for migration in birds:
a) Scarcity of food.
b) Adverse climatic conditions.
c) Abundance of enemies.
d) Increased level of gonadal hormones in the blood.
e) Genetic imprint.
$$\textbf{Option (B):}$$ Adaption
$$\bullet$$ Adaptation is the heritable change in the genetic constitution that occurs through the evolution process over a longer period of about 1000 years. Example: erect and bipedal adaptation in humans.
$$\textbf{Option (C):}$$ Hibernation
$$\bullet$$ Hibernation is the escaping of poikilotherms during the winter season, they have seasonal torpor (decreased physiological activity). For example, snakes go inside a deep hole during the winter season.
$$\textbf{Option (D):}$$ Aestivation
$$\bullet$$ Aestivation is the next seasonal torpor animals due to extreme climate ( hot environment). Example: insects, amphibians, etc.
$$\textbf{Conclusion:}$$ Hence, the correct option is A.
Plants in cold regions shed leaves because of
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Cold weather
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Water scarcity
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Longer nights
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Shorter days
Explanation
Plant actually shed their leaves in winter, because they suffer from drought or water scarcity. Deciduous plants lose their leaves to conserve water or to better survive winter weather conditions, they must regrow new foliage during the next suitable growing season.
So, the correct answer is 'Water scarcity'.
Which of the following departments prepare weather reports?
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Pollution department
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Health department
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Meteorological department
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Environment department
Explanation
The Indian Meteorological Department is an agency of the Ministry of Earth Sciences of the Government of India. It is the principal agency responsible for meteorological observations, weather forecasting, preparing weather reports and seismology (the study of earthquakes).
So, the correct answer is option C.
Which of the following instruments is used to measure rainfall?
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Barometer
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Thermometer
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Rain gauge
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All of the above
Explanation
$$\textbf{Correct option:}$$ $$\textbf{(C)}$$
$$\textbf{Solution:}$$
$$\textbf{Option (A)}$$
$$\bullet$$ It's a device that measures atmospheric pressure.
$$\bullet$$
It is particularly useful for weather forecasting and height determination.
$$\textbf{Option (B)}$$
$$\bullet$$ A thermometer is a device that quantitatively monitors the temperature of a system.
$$\bullet$$
Our body temperature is measured with a clinical thermometer.
$$\bullet$$
This thermometer has a temperature range of 35 to 42 degrees Celsius.
$$\textbf{Option (C)}$$
$$\bullet$$ Rain gauze is a device that monitors the amount of precipitation that has fallen in a certain region.
$$\bullet$$
So that it can measure the amount of rain that falls in a specific location.
$$\bullet$$
It consists of a cylinder-shaped jar that collects rainwater.
$$\bullet$$
To avoid rain water splashing from the vessel, install rain gauze 30 cm above ground level.
$$\textbf{Thus the Correct option is (C)}$$
Some animals living in water have streamlined body shapes. This helps in:
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Store food and fats
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Reduce resistance in water
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Reduce loss of water
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Keep the body warm
Explanation
Aquatic organisms have a streamlined body shape. Streamline is defined as a shape that is wider at the centre and narrows down towards the periphery.
While swimming, it provides the least amount of resistance, facilitating easy movement as well as increasing speed.
So the correct answer is option B.
Underwater divers wear ............ to move easily in water.
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A head torch
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Oxygen cylinder
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Flippers
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A watch
Explanation
Underwater divers wear fin-like flippers, because, the fin-like flippers aid in swimming easily. The shape of the flippers is such that it can easily pass through water. This makes swimming easy and hence reduces the effort of the muscles in swimming. Since fins provide a wider area to push and move against the water, divers need not use their hands anymore to move underwater.
So, the correct answer is 'Flippers'.
An animal is taken to polar region. Which of the following adaptive characteristic may help it to survive in the new environment?
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Growth of thick and less hairy skin
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Sharp beaks and strong claws
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Growth of thick fur on its skin
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Light weight wings to fly
Explanation
The development of characteristics which helps an organism to survive in a particular environment is known as adaptation. Animals possess a wide range of structural and functional adaptive features. Animals taken to polar regions may have the following adaptive features:
1. Low surface area to volume ratio
2. Small extremities to reduce heat loss - shorter ears and limbs
3. Thick layer of body fat/blubber - present in seals to reduce body heat loss
4. Thick camouflaged fur
5. Thick fur on paws
So, the answer is C.
Pattern of the rainfall depends on the pattern and number of __________ .
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Water pump
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Water bodies
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Human population
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Noe of the above
Plants are killed in winter by frost
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Because of dessication and mechanical damage to the tissue
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Because no photosynthesis take place at such a low temperature
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Because respiration ceases at such low temperature
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Because there is no transpiration
A leaf insect looks like leaves and a polar bear living in snowy regions has white fur on its skin. Although these animals are very different from each other, what is the one way in which they are similar?
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They use their bodies to attack enemies.
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They use their bodies to confuse enemies.
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They use their bodies to prepare food.
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They migrate to long distances to protect themselves from enemies.
Explanation
Polar bears have white fur so that they can camouflage (a phenomenon to confuse predators) into their environment. Their coat is so well camouflaged in Arctic environments that it can sometimes pass as a snowdrift.
The leaf insect exhibits mimicry where it resembles an unrelated species of organism (plant leaf) to save itself from predation.
So, the correct answer is option B.
Water scarcity is usually found in
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Desert conditions
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Polar regions in winter
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Only A
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Both A and B
Explanation
Water scarcity is the lack of fresh water resources to meet water demand. Water scarcity is seen in desert regions because the precipitation is very less and rainfall is also minimum.
During winter in polar regions, water is converted into ice due to very cold temperatures. This, in turn, leads to water scarcity in polar regions.
So, the correct answer is 'Both A and B'.
The region, which receives very little rainfall, is:
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Dry and hot
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Dry and cold
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Humid and hot
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Humid and cold
Explanation
The region, which receives very little rainfall, is dry and hot. This is a typical desert climate.
The climatic condition of northeast India is
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Hot
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Cold
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Wet
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Moderate
Explanation
The northeastern India receives rain for a major part of the year.
Therefore, the climate of the north-east is considered wet.
Minimum temperature occurs in
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Night
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Early morning
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Afternoon
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Midnight
Western India has
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Winter
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Rain
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Hot summers
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Humid climate
Explanation
$$\textbf{Correct option:}$$ $$\textbf{(C)}$$
$$\textbf{Solution:}$$
$$\bullet$$ The majority of West India, including regions like Gujarat and Rajasthan, have highly hot and arid climates.
$$\bullet$$
This is due to the southwest monsoon causing less rain in these places, as well as the fact that there are nearly no rivers in the area to aid with vegetation.
$$\bullet$$
The summers in these locations are extremely hot.
$$\bullet$$
During the months of April and May, the temperature reaches 45-50 degrees Celsius.
$$\textbf{Thus the Correct option is (C)}$$
Weather prediction helps in
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Changing the weather
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Planning an event
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Saving people's life
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Both B and C
Explanation
Weather forecasting/prediction is the application of science and technology to predict the conditions of the atmosphere for a given location and time. Accurate weather predictions are important for planning our day-to-day activities. Weather forecasting helps us to make more informed daily decisions, and may even help keep us out of danger. Since outdoor activities are severely curtailed by heavy rain, snow and wind chill, forecasts can be used to plan activities around these events, and to plan ahead and survive them.
So, the correct answer is '
Both B and C'
Woolen clothes are mostly used in _______
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Rainy days
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Summer days and cloudy days
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Cold days
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Cloudy days and rainy days
Explanation
Woolen clothes are used in cold days. Woolen clothes do not allow body heat to go out and keeps the body warm.
High wind location in India are
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Gujarat
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Madhya Pradesh
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Tamil Nadu
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All
Explanation
High wind location in India are
1) Gujarat
2) MP
3) Tamil Nadu
4) Coastal area
5) Bay of Bengal
6) Some parts of Rajasthan
7) Some parts of Karnataka .
The monsoon winds that carry a lot of water to India come from the?
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South-East
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North-East
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North-West
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None of these
Explanation
Northeastern winds are the ones that move over the Himalayas ghats and the plains of Ganga over the coast of the Indian ocean. These winds are extremely moist and bring about rains in India. They are also called Retreating monsoon.
So, option B " North - East" is the correct answer.
If one litre of water at $$\displaystyle { 25 }^{ \circ }C$$ is mixed with one litre of water at $$\displaystyle { 45 }^{ \circ }C$$ the temperature of the water will be
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$$\displaystyle { 70 }^{ \circ }C$$
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$$\displaystyle { 20 }^{ \circ }C$$
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$$\displaystyle { <25 }^{ \circ }C$$
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$$\displaystyle >{ 25 }^{ \circ }C\& <{ 45 }^{ \circ }C$$
Explanation
The temperature of the mixture would be $$\displaystyle >{ 25 }^{ \circ }C\& <{ 45 }^{ \circ }C$$, as there would be transfer of heat in between water molecules from higher temperature to lower temperature.
A weather report gives details of which of the following?
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Past 24 hours
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Weather for the day
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Weather for a year
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Both A and B
Which of these best describes the difference between weather and climate?
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Weather includes short term changes in the atmosphere while climate includes average temperature, precipitation, sunshine and wind velocity.
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Weather includes temperature and precipitation while climate only includes temperature.
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Weather changes very little while climate changes drastically.
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Weather depends on a particular location while climate is described worldwide.
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Weather includes average temperature and wind velocity while climate includes only precipitation.
Explanation
Weather is the state or condition of the atmosphere that lasts for a short period of time.
Climate is the distribution of weather patterns in a given area that may last for a longer period of time.
Hence,
the correct answer is option A.
The weather report carries information about
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Humidity
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Rainfall
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Global warming
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Both A and B
Explanation
$$\textbf {Correct Option (D):} $$
$$\textbf {Solution:} $$
$$\textbf {Option (A):} $$
$$\bullet$$ Humidity is said to be the amount of water present in the atmosphere.
$$\textbf {Option (B):} $$
$$\bullet$$ Rainfall is the amount of water precipitation post the summer season.
$$\bullet$$ W
hen all the water evaporated due to sun heat accumulates in the form of clouds in the sky and condense again to fall on earth.
$$\textbf {Option (C):} $$
$$\bullet$$ Global warming is a natural disaster in the modern age where due to various gases and immense pollution the overall atmospheric temperature rises at a threating level.
$$\bullet$$ This is not considered a part of weather.
$$\textbf {Option (D):} $$
$$\bullet$$ Hence, option (A) and (B) are correct.
Hence, the option(D) is the correct answer.
Weather reports are prepared by
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Meteorological department of the government
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Agricultural department of the government
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Coal department of the government
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Electricity department of the government
Explanation
The Meteorological department of the government prepares the weather reports.
To make weather predictions, this department collects data on temperature, wind, and rainfall, etc.
So the correct answer is option A.
Which of the following region have the hot climatic condition?
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Brazil
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Alaska
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Arab
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India
The temperature of the cold regions can be
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Lower than 20 degrees
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Lower than 37 degrees
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Lower than -37 degrees
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None of the above
The layer of fat and the fur on the skin in the polar bears help in
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Preventing the exposure to cold
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Preventing the loss of heat
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Protection from predators
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All of the above
Cold climatic condition is found
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Near the pole
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Away from the pole
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Near the equator
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All of the above
Explanation
$$\textbf{Correct option:}$$ $$\textbf{(A)}$$
$$\textbf{Solution:}$$
$$\textbf{Option (A)}$$
$$\bullet$$ Between the Arctic Circle and the North Pole, and the Antarctic Circle and the South Pole, is the cold zone.
$$\bullet$$
The Polar area is another name for this zone.
$$\bullet$$
The temperature is exceptionally low throughout the year since it receives the Sun's strong slanting rays.
$$\bullet$$
The polar areas are frequently covered in ice because of this.
$$\textbf{Option (B)}$$
$$\bullet$$ As the angle of the Sun's beams decreases as it approaches the Poles, this zone receives slanting rays.
$$\bullet$$
As a result, the temperature in this zone is moderate.
$$\textbf{Option (C)}$$
$$\bullet$$ For virtually the whole year, this location receives direct vertical rays from the Sun.
$$\bullet$$
As a result, this zone receives the most heat from the Sun.
$$\bullet$$
The torrid or tropical zone is the name given to this area.
$$\textbf{Thus the Correct option is (A)}$$
The special thermometer used to record temperature is called as
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Maximum thermometer
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Minimum thermometer
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Maximum-minimum thermometer
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None of the above
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