Last updated on October 9th, 2023 at 09:16 pm
Chhatisgarh Board Class 7 Chapter 1 Life on Earth Solutions
Chhattisgarh State Board Class 7 Chapter 1 Life on Earth Solutions / exercise, which includes fill-in-the-blank sentences, true or false statements, and questions and answers.”
Fill in the blanks
a. The three essential requirements of life are -…………….., ……………… and ………………
b. In deserts, days are very……………. and nights are very………….
c. Living organisms are linked to each other through…………………..
d. The place where living organisms live and reproduce is called……………
e. Due to ……………….. living organisms live in their habitat without any difficulty.
a. The three essential requirements of life are – food, water, and air.
b. In deserts, days are very hot and nights are very cold.
c. Living organisms are linked to each other through food chains.
d. The place where living organisms live and reproduce is called their habitat.
e. Due to adaptations, living organisms live in their habitat without any difficulty.
Identify true and false statements from the following and correct the wrong statement and rewrite it.
a. There is water all around in a desert.
b. Sea plants respire by taking oxygen from the air.
c. Major carnivorous animals of Arctic region are rats, deer and rabbit.
d. Animals living in the Arctic region have hair on their body.
e. Organisms living in Arctic or desert region can live in our habitat.
a. False. The correct statement is: There is very little water in a desert.
b. False. The correct statement is: Sea plants respire by taking oxygen from the air dissolved in water.
c. False. The correct statement is: Major carnivorous animals of the Arctic region are bear, wolf, fox, and owl.
d. True.
e. False. The correct statement is: Organisms living in Arctic or desert regions cannot survive in our habitat, and vice versa.
Answer these –
Q. Why don’t we see lizards and weevil (ghun) drink water?
A. Lizards and weevils (ghun) do not need to drink water because they get sufficient water from the food they eat, and they do not require a separate source of water.
Q. Where does the tree growing from a wall get water and minerals from?
A. The tree growing from a wall gets water and minerals from the ground through its roots, even if the roots extend through cracks or crevices in the wall. The tree absorbs these nutrients from the surrounding soil.
Q. Why are most of the animals found in arctic region white in colour?
A. Most of the animals found in the Arctic region are white in color as a form of camouflage. This helps them blend in with the snowy environment, making it difficult for predators to spot them against the white background.
Q. Think of and write a food chain which starts in the ocean but ends on earth.
A. Food chain starting in the ocean but ending on earth: Ocean plants and algae -> Small animals -> Big fish -> Seals -> Polar bears.
Q. Make a food chain each for the desert and for the ocean.
A. Food chain for the desert: Desert plants (e.g., cactus) -> Desert insects (e.g., desert lizards, rats) -> Hawks and owls.
Food chain for the ocean: Ocean plants and algae -> Small animals (zooplankton) -> Small fish -> Larger fish -> Top predators (e.g., sharks or dolphins).
Q. Living organisms get modified according to the environment in which they live. If the environment on the earth became the same everywhere, how would be the living organisms effected? Write in your own words.
A. If the environment were the same everywhere on Earth, living organisms would have difficulty adapting to specific conditions in their specific habitats. Special adaptations cannot adapt to new, similar environments, so many organisms will struggle to survive. Organisms adapted to different habitats will no longer find suitable conditions, leading to a reduction in biodiversity or extinction.
Q. Write in your own words how bats found in the caves are dependent on the plants growing outside the caves.
A. Bats, which live in caves, depend on plants growing outside the caves for their food. In the evening, these bats emerge from caves to feed on small insects, flower nectar and fruits. Plants outside are a source of food and nectar for bats and insects, so they are an important part of the bats’ food chain.
Q. How would polar bears be effected if all the algae on the surface of the oceans disappear?
A. Polar bears would be greatly affected if all algae disappeared from the surface of the oceans. Algae are the foundation of the entire marine ecosystem, and they are a major producer of the marine food chain. Populations of small fish and seals, the polar bear’s main prey, would decline without the algae. Polar bears will face shortage of food, putting their existence in danger.
Class 7 chapter 1 life on earth extra question answer
Q1: What are the three basic requirements that all living organisms, including plants and animals, need to survive?
A1: All living organisms require food, water, and air to survive.
Q2: Why do organisms need food, water, and air?
A2: Organisms need food for energy, water for various metabolic processes, and air for respiration to carry out their life functions.
Q3: What is a habitat, and why is it important for organisms?
A3: A habitat is the place where living beings live and reproduce. It is important because organisms are adapted to their specific habitat, and their body structures are modified to survive in those conditions.
Q4: How do organisms adapt to their habitats?
A4: Organisms adapt to their habitats through physical and behavioral changes that help them survive and thrive in their specific environmental conditions.
Q5: What is a food chain, and why does it typically begin with a plant?
A5: A food chain is a sequence of organisms where each organism is a source of food for the next. It typically begins with a plant because plants are the primary producers that convert sunlight into energy through photosynthesis, forming the basis of most food chains.
