GSEB Solutions for Class 7 Science and Technology – Food Chain (English Medium)
|Name||Food (what they eat?)|
|1. Snake||Frog , Birds, Rodents|
|2. Peacock||Grains, Insects, Snakes, Small reptiles|
|3. Deer||Green leaves, Grasses, Carrots|
|4. Tiger||Rodents, Small reptiles and mammals|
|5. Ant||Fruits, Seeds|
|6. Fish||Small aquatic plants, Seaweed|
|7. Frog||Small insects, Flies, Mosquitoes, Moths|
|8. Duck||Grasses, Aquatic plants, Fish, Insects|
|9. Spider||Trapped insects|
|10. Lizard||Ants, Termites, Bees|
If sun does not appear, it means that the Earth has stopped spinning. There will be no heat in the environment, crops will not survive, human beings and animals will feel cold and the whole ecosystem will be disrupted.
The deer population remained the same after 5 years because the environmental factors remained at equilibrium. They fed on the food that was available in the forest and there was no intervention of human beings such as hunting the deer and affecting the forest life.
After 3 years of obeyance of order, there must be human intervention like hunting. There may also be introduction of foreign species to the native land that may have caused the decline of the deer population.
The above diagram depicts a five step food chain. Grass gets its food from solar energy, grasshopper consumes grass which is consumed by snake and the hawk in turn eats the snake.
Living things (Biotic factors)-
- Animals like tiger, lion, frogs etc
- Herbs and shrubs
- Other insects like ants, beetles, worms
Non-living things (Abiotic factors)-
- Rocks, dirt, water, air and temperature
- Name of place- Pond
- Non-living things include soil, water, climate, temperature.
- Insects like termites, ants, worms.
- Animals like fishes, deer, cranes, ducks.
- Yes, dirtiness includes soil, dust from rocks.
- Useless things in a pond are seaweeds, decaying organic matter.
- Yes, there occurs water and soil pollution. The dirt in the pond pollutes the water thereby causing harm to the aquatic plants and animals. The soil present near the pond erodes.
|Endangered Animals||Extinct Animals|
|Asian elephant||Dodo bird|
|Blue whale||Passenger pigeon|
|Giant Panda||White dolphin|
- Preventing overgrazing of animals.
- Preventing forest fire.
- Planting more trees (afforestation).
- Statistical survey of animal populations.
- Construction of zoos, national parks and sanctuaries.
- Participate in the awareness program for conservation of wildlife like slogans and debates.
- Green plants – They produce food by the process of photosynthesis that include trees, bushes and grasses
- Herbivores – They directly eat plants and are known as the primary consumers likedeer, rabbit, rats.
- Carnivores – They are the biotic components known as the secondary consumers such as tigers, lion.
- Parasites – They live inside or on the body surface of another organism and obtain food from it.
- Decomposers – They live on dead and decaying plant and animal bodies that include bacteria, fungi etc.
- Temperature – The energy obtained from sunlight is essential for the production of food by photosynthesis.
- Air – Oxygen from the air is essential to animals for respiration and is also an agent for dispersal of seeds, fruits.
- Water – It is required for various biochemical reactions which occur in organisms.
- Temperature – Hot, mild or cold temperature influences the kind of body functions of plants and animals.
- Soil – Contains water and mineral nutrients that help in the growth of plants.
Food chain can be defined as the sequential arrangement of organisms in which all organisms are inter-related and depend on each other for their food.
For example: The light energy of sun is trapped by green plants i.e. herbivores who constitute the first level. These green plants are eaten by herbivores and herbivores, in turn, become the source of food for carnivores.
Animals – Camel, Scorpion, Desert snakes
Birds – Eagles, Owls, Quail, Doves
Insects – Desert cricket, beetles, spiders
Plants – Cacti, Rock plants, Elephant tree, Willow tree