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Fill in the blanks in the paragraph given below. The weather of a place is the day-to-day condition of the a) atmosphere with respect to b) Temperature, c)Humidity,d) rainfall, e) wind speed at that place, while climate is the f) average weather pattern has taken over many years.

Soln: The weather of a place is the day-to-day condition of the a) atmosphere with respect to b) Temperature, c)Humidity, d) rainfall, e) wind speed at that place, while climate is the f) average weather pattern has taken over many years.

ScienceClass 7CBSE

Differentiate between: (i) Weather and climate (ii) Humidity and rainfall (iii) Climates of the polar region and tropical rainforest (iv) Maximum and minimum temperatures of the day

Soln: Weather Climate Weather is the daily fluctuation in temperature, humidity, etc. Climate is the average weather pattern of a place. Humidity Rainfall Humidity indicates the wetness of a place due to the amount of moisture in the atmosphere Rainfall is the drops of water that fall from clouds on the ground. Polar region Tropical rain forest The polar region remains very cold for most part of the year. The tropical rainforest is hot and humid throughout the year Maximum temperature Minimum temperature Occur in the day, during the afternoon Occurs in the night, at dawn

ScienceClass 7CBSE

Mention two adaptive features of penguins that help them in swimming

Soln: Their bodies are streamlined and their feet have webs, making them good swimmers.

ScienceClass 7CBSE

Write two common adaptive features of a polar bear which help in keeping it warm.

Soln: (a) A layer of fat under the skin for insulation. (b) Long curved and sharp claws to walk and run on slippery ice.

ScienceClass 7CBSE

Name two animals each that live in the Polar region and Tropical rain forests.

Soln: Polar region- Polar bears and Penguins Tropical rain forests- rain deer, tiger

ScienceClass 7CBSE

Why is it difficult to predict the weather of a place while it is easy to predict its climate?

Soln: Because weather can vary over a short period of time, whereas climate as it is the average weather pattern taken over a long time.

ScienceClass 7CBSE

Match the animals mentioned in Column I with their characteristic features given in Column II. Column I Column II a) Red-eyed frog i) Very sensitive hearing b) Penguin ii) Streamlined body c) Tiger iii) Silver-white mane d) Lion-tailed macaque iv) Sticky pads on feet

Soln: Column I Column II a) Red-eyed frog iv) Sticky pads on feet b) Penguin ii) Streamlined body c) Tiger i) Very sensitive hearing d) Lion-tailed macaque ii) Silver-white mane

ScienceClass 7CBSE

Unscramble the following words using the hints given against them. MATLICE (Hint: weather pattern in a region over a period of time) AROPL (Hint: coolest region on earth) TREHMEOMRET (Hint: used to measure temperature) UHIDYTMI (Hint: feature of weather)

Soln: (i) Climate (ii) Polar (iii) Thermometer (iv) Humidity

ScienceClass 7CBSE

State whether the following statements are True or False. Correct the false statements. (a) It is easy to predict the weather rather than climate. (b) Since very few preys are available, the polar bear does not need to have a strong sense of smell. (c) Penguins stick together to fight the cold polar climate. (d) Tropical rainforests are cool and humid throughout the year because of heavy rains all the time.

Soln: a) False- It is easy to predict the climate rather than the weather. b) False- polar bear needs to have a strong sense of smell. c) True d) False- Tropical rainforests are hot and humid throughout the year because they are located near the equator.

ScienceClass 7CBSE

Give one example of an animal that can live both in water and on land.

Soln: Frog

ScienceClass 7CBSE

“A fish dies when taken out of water whereas a wall lizard will die if kept underwater.” Mention the term used to describe such abilities that allow fish and lizard to survive in their respective habitats.

Soln: Adaptation

ScienceClass 7CBSE

Choose the odd one from the following options : (a) A thick layer of fat under the skin (b) White fur (c) Long grasping tail (d) Wide and large feet with sharp claws

Soln: The answer is (c) Long grasping tail Explanation: The long grasping tail is the adaptation found in animals of the tropical region whereas others option gives adaptations of animals of the polar region.

ScienceClass 7CBSE

The coldest region on earth is the – (a) polar region (b) tropical region (c) temperate region (d) coastal region

Soln: The answer is (a) polar region Explanation: Polar regions are covered with snow, and it is very cold for most part of the year. For six months, the sun does not set at the poles, while for the other six months the sun does not rise. In winter, the temperature can be as low as –37°C.

ScienceClass 7CBSE

Read the following environmental conditions of tropical rainforests. (i) A hot and humid climate (ii) Unequal lengths of day and night (iii) Abundant rainfall (iv) Abundant light and moisture Identify the conditions from the above list that are responsible for the presence of large number of plants and animals in tropical rainforests. (a) (i) and (ii) (b) (i) and (iii) (c) (i), (iii) and (iv) (d) (ii) and (iv)

Soln: Answer is (c) (i), (iii) and (iv) Explanation: The tropical region has generally a hot climate because of its location around the equator. Even in the coldest month, the temperature is generally higher than about 15°C. During hot summers, the temperature may cross 40°C. Days and nights are almost equal in length throughout the year. These regions get plenty of rainfall. Because of these reasons, tropical rain forests support a large number of plants and animals.

ScienceClass 7CBSE

Which of the following statement is incorrect for penguins? (a) They huddle together (b) They cannot swim (c) They have webbed feet (d) They have streamlined body

Soln: The answer is (b) They cannot swim Explanation: Penguin is white and merges well with the white background. It has thick skin and a lot of fat to protect it from the cold. Penguins huddled together to keep themselves warm. Like polar bears, penguins are also good swimmers. Their bodies are streamlined and their feet have webs, making them good swimmers.

ScienceClass 7CBSE

Given below are some adaptive features of animals: (i) A layer of fat under the skin (ii) Long, curved and sharp claws (iii) Slippery body (iv) Thick white fur Which of them are the adaptive features of a polar bear? (a) (i) only (b) (i) and (ii) only (c) (i), (ii) and (iii) only (d) (i), (ii), and (iv) only

Soln: Answer is (d) (i), (ii), and (iv) only Explanation: To live in an extremely cold climate, the polar bear has many adaptations, such as: (a) The layer of fat under the skin for insulation. (b) Long curved and sharp claws to walk and run on slippery ice. (c) Thick white fur. White colour protects it from predators and thick layer keep it warm. (d) Other features are rounded body, small ears and a strong sense of smell.

ScienceClass 7CBSE

Paheli went to a wildlife sanctuary where she saw dense vegetation of trees, shrubs, herbs and also a variety of animals like monkeys, birds, elephants, snakes, frogs, etc. The most likely location of this sanctuary is in the – (a) temperate region (b) tropical region (c) polar region (d) coastal region

Soln: The answer is (b) tropical region Explanation: The Wildlife sanctuary which Paheli went to was in a tropical region because this region has favourable conditions to support a wide variety of living organisms. The remaining options, like the temperate region, polar and coastal region, will not support a variety of wildlife as a tropical region.

ScienceClass 7CBSE

Which of the following briefly describes the desert climate? (a) Hot and humid (b) Dry and humid (c) Hot and dry (d) Hot and wet

Soln: The answer is (c) Hot and dry Explanation: In the desert, the temperature is high during most parts of the year, and the desert receives very less rainfall hence the climate in the desert will be hot and dry.

ScienceClass 7CBSE

Out of the given definitions, which is the most appropriate definition of climate? (a) Changes in weather conditions in a year. (b) The average weather pattern for many years. (c) Change in the weather pattern in a few years. (d) Weather conditions during summer.

Soln: The answer is (b) Average weather pattern of many years. Explanation: Climate is the weather conditions of an area prevailing for a long period of time.

ScienceClass 7CBSE

The maximum and minimum temperature displayed daily in the weather bulletin refers to the – (a) highest day temperature and lowest night temperature of the day. (b) highest day temperature and highest night temperature of the month. (c) the temperature recorded at 12 noon and at midnight (00.00 hrs). (d) the average highest temperature of the day and the average lowest temperature of night.

Soln: The answer is (a) highest day temperature and lowest night temperature of the day. Explanation: Highest day temperature occurs in the afternoon and lowest temperature of the day occurs in the dawn.

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