Complete the table: Name of the plants and animals Parts that help the organism to survive in the desert Reason Cactus Camel Gerbil Ostrich

Name of the plants and animals Parts that help the organism to survive in the desert Reason Cactus Long roots, leaves and stem A cactus is able to survive in the desert due to the following features: It has long roots that go deep inside the soil for absorbing water. Its leaves are in the form of spines to prevent water loss through transpiration. Its stem is covered with a thick waxy layer to retain water. Camel Legs, Eyelashes, Nostrils and hump Camels are mammals with long legs, a big-lipped snout and a humped back. The camel has many adaptive traits for their life in the desert. They have wide feet for walking in sand. They have long eyelashes and thin, slit nostrils that they can close to protect them from blowing sand. They are adapted to survive a long time without water and food. Gerbil Skin coat of gerbil Gerbils have several physical adaptations that help them avoid predators. Gerbils have much less odour than other rodents, such as rats and mice. Their coloration in the wild is usually light brown, which blends in well with the desert surroundings and makes them less visible to birds of prey. Ostrich Long neck Ostriches can also withstand hot temperatures and go for long periods of time without water, usually getting enough moisture from the plants they eat. The ostrich also has a long neck which also helps to spot predators.

Complete the table given below: Nature of dependence Source Food Shelter Clothes Fuel Commercial Medicine

Nature of dependence Source Food Cow, buffalo, goat, poultry birds, etc. Food obtained from animals is the main source of protein and include fish, milk, meat, poultry, and cheese. Shelter A human being needs shelter to protect themselves. They need house to protect themselves from rain, cold, sun, wild animals, etc. Some kind of houses are made of mud, wood straw, bamboo, etc. Clothes Clothes today are made from a wide range of different materials. Traditional materials such as cotton, linen and leather are still sourced from plants and animals. The source of synthetic fibres and fabrics is the fossil fuel crude oil. Fuel Ethanol is a renewable fuel that can be made from various plant materials, collectively known as “biomass.” Commercial Many skin treatments and cosmetics also contain algae. Algae make great industrial thickeners, and some companies also claim antioxidant, mineral replenishing, and moisturizing benefits from algae. Algae anti-ageing creams, detoxifying masks, and cleansers can be found in a drug store near you. Medicine Specific medications commonly used today that are derived from animal venoms, toxins, or secretions. Medicinal plants such as Aloe, Tulsi, Neem, Turmeric and Ginger cure several common ailments.

Complete the table: Name of animals Name of the habitat Their problems 1) Vulture 2) One-horned Rhinoceros 3) Fishing Cat 4) Gangetic Dolphin

Name of animals Name of the habitat Their problems 1) Vulture The preferred habitats of the Vulture are deserts, savannas and grassland near a water source. Diclofenac is toxic to vultures even in small doses, causing kidney failure. That results in uric acid accumulating in the birds' blood and crystallizing around their internal organs—a condition called visceral gout. Carrion depots have become rare in villages. As, a result vultures do not get adequate food. 2) One-horned Rhinoceros Rhinos' habitats include tropical and subtropical grasslands, savannas and shrublands, tropical moist forests, deserts and shrublands are among their habitats. Their habitat depends on the species. The greatest threat facing African Rhinos is poaching for the illegal trade in their horns, which has soared in recent years. 3) Fishing Cat Fishing cats are generally found in wetland areas, such as marshes, swamps and mangrove forests. Fishing cats are endangered because humans are destroying their habitat, and driving away their prey species. 4) Gangetic Dolphin This fresh water mammal lives in the Ganges and Brahmaputra river and their tributaries. The existence of Gangetic Dolphin is endangered due to various activities of human beings. They are endangered due to lack of food. They are facing breeding problems.

E M B I B E

Environment and Science Class 8>Chapter 10 - Biodiversity, Environment Crisis and Conservation of Endangered Animals>Exercise 3>Q 1

MEDIUM

8th West Bengal Board

IMPORTANT

Earn 100

Construct a food chain by choosing at least three organisms from the above list. Mention who is the producer, herbivore or carnivore in the food chain.

Chameleon Sirish Snake Mango Langur Deer

Fox Kusum Owl Rose apple Elephant Fish

Peacock Mahogany Bear Banyan Bamboo Crab

Eagle Oak Squirrel Emblica Chalta Turtle

Insect Deodar Leopard Garan Rhinoceros Tiger

Earthworm Pine Woodpecker Grass Ant Mongoose

Bat Bee Termite Pangolin Lion Otter

Important Questions on Biodiversity, Environment Crisis and Conservation of Endangered Animals

MEDIUM

8th West Bengal Board

IMPORTANT

Environment and Science Class 8>Chapter 10 - Biodiversity, Environment Crisis and Conservation of Endangered Animals>Exercise 4>Q 1

See the picture and identify the desert life-forms.
Question Image

MEDIUM

8th West Bengal Board

IMPORTANT

Environment and Science Class 8>Chapter 10 - Biodiversity, Environment Crisis and Conservation of Endangered Animals>Exercise 5>Q 1)

What is stored in the humps of the camel?

MEDIUM

8th West Bengal Board

IMPORTANT

Environment and Science Class 8>Chapter 10 - Biodiversity, Environment Crisis and Conservation of Endangered Animals>Exercise 5>Q 2)

Camels are the primary mode of transport in the desert. What is this camel called?

HARD

8th West Bengal Board

IMPORTANT

Environment and Science Class 8>Chapter 10 - Biodiversity, Environment Crisis and Conservation of Endangered Animals>Exercise 6>Q 1

Complete the table:

Name of the plants and animals	Parts that help the organism to survive in the desert	Reason
Cactus
Camel
Gerbil
Ostrich

MEDIUM

8th West Bengal Board

IMPORTANT

Environment and Science Class 8>Chapter 10 - Biodiversity, Environment Crisis and Conservation of Endangered Animals>Exercise 7>Q 1

What measures can be taken to prevent the expansion of Deserts?

HARD

8th West Bengal Board

IMPORTANT

Environment and Science Class 8>Chapter 10 - Biodiversity, Environment Crisis and Conservation of Endangered Animals>Exercise 8>Q 1)

Complete the table given below:

Nature of dependence	Source
Food
Shelter
Clothes
Fuel
Commercial
Medicine

HARD

8th West Bengal Board

IMPORTANT

Environment and Science Class 8>Chapter 10 - Biodiversity, Environment Crisis and Conservation of Endangered Animals>Exercise 9>Q 1)

Complete the table:

Name of animals	Name of the habitat	Their problems
1) Vulture
2) One-horned Rhinoceros
3) Fishing Cat
4) Gangetic Dolphin

Learn and Prepare for any exam you want !

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Chameleon	Sirish	Snake	Mango	Langur	Deer
Fox	Kusum	Owl	Rose apple	Elephant	Fish
Peacock	Mahogany	Bear	Banyan	Bamboo	Crab
Eagle	Oak	Squirrel	Emblica	Chalta	Turtle
Insect	Deodar	Leopard	Garan	Rhinoceros	Tiger
Earthworm	Pine	Woodpecker	Grass	Ant	Mongoose
Bat	Bee	Termite	Pangolin	Lion	Otter