Maharashtra Board Class 7 Science Solution Chapter 1 – The Living World Adaptations and Classification
Balbharati Maharashtra Board Class 7 Science Solution Chapter 1: The Living World Adaptations and Classification. Marathi or English Medium Students of Class 7 get here The Living World Adaptations and Classification full Exercise Solution.
Std |
Maharashtra Class 7 |
Subject |
General Science Solution |
Chapter |
The Living World Adaptations and Classification |
Exercise Solution
(1.)
A GROUP | B GROUP |
1. LOTUS
|
d) Adapted to live in water. |
2. ALOE | c) Adapted to live in deserts. |
3. CUSCUTTA | b) Haustorial roots for absorption. |
4. VENUS FLYTRAP | a) Leaves attract insects. |
(2.) a) WHY IS MY SKIN WHITE AND THICK AND WHY IS THERE A THICK LAYER OF FAT UNDERNEATH?
ANS:- The penguin have black and white skin for a type of adaptation. The white chest of penguins protects them in the water fron seeing below against the lighter sky coming through the water surface. Their backs are black to help them blend in with the darker and deeper sea water below them for protecting them from predators.
They have a thick layer of fat underneath because it keeps warm under the extreme cold condition in the water.
b) WHY DO WE LIVE IN FLOCKS STICKING CLOSE TO EACH OTHER?
ANS:- Penguins live in flocks sticking close to each other because they live in the coolest regions of earth. So to find and feel warmth they remain in flocks sticks close to each other to escape the extreme cold conditions.
c) WHICH GEOGRAPHICAL REGION DO I INHABIT?WHY?
ANS:- Penguins are found in the geographical region of Antarctica, Africa , Australia and New Zealand.
d) WHICH ADAPTATIONS SHOULD YOU HAVE TO ENABLE YOU TO LIVE PERMANENTLY IN THE POLA REGION? WHY?
ANS:-The adaptations should have to enable tolive in the polar region-
1.small body with small wings. 2.skin should be covered with feathures. 3. Need strong muscle in chest and wings and black and white skin with a thick layer under at beneath it.
(3.) a) WHO IS LYING?
ANS:- Cockroach has six legs not five and cockroach is lying. The cactus are also lying for its fleshy, green part is the stem and not a leaf.
(4.) a) THERE IS EXTREME HEAT IN DESERTS.
ANS:- The animals and trees which are found in the extreme heat in deserts have special system in the body to survive such environment. The trees of vthe desert area have special photosynthetic pathway. Their leaves are reduced to spines to minimize water loss. Similarly desert animals have a thick skin toprevent loss of water from the body. Their legs are long with flat soles. The eyelashes are long and thick. These are protected by folds of skin in the extrme heat in desert and to prevent the loss of water.
b) GRASSLANDS ARE LUSH GREEN.
ANS:- Grasslands are lush green for the presence of diverse of bushes and grasses. Fibres roots of grasses prevent soil erosion. Forest are dense. Animals like tiger, elephants and others can remain hidden in these graases. Grasses are very short in cold regions. Animals which are found in grasslands have adaptations like strong legs to run fast.
C) INSECTS ARE FOUND IN LARGE NUMBERS.
ANS:- Insects are found in large numbers for they developed theirbodies to survive the nature of environment. They are found in deserts and Antartic region. Their body is light in weight. And adapted for flying. They can fly with two pairs of wings. Like bats can fly with the help of patagium, a thin fold skin between their forelegs and hind legs.
D) WE HIDE.
ANS:- some of the species are able to hide themselves by their colour . They protect them from the predators and prey. They show adaptations in skin, soles of feet, body colour etc. For example, the house of lizard and monitor lizards have clawed toes and thin soles whereas snakes have a scaly skin.
E) WE HAVE LONG EARS.
ANS:- Animals have long ears are found in grasslands. Their long and freely moving ears help them to receive sounds from long distances and different directions. And yhey act as a cooling system of the body.
(5.) Answer the following.
a) WHY IS THE CAMEL CALLED THE ‘SHIP OF THE DESERT’?
ANS:- Camel is called the ‘Ship of deserts’. Their bodies modifications are helped to survive in the hot and dry conditions of the deserts. They have long legs to help them to walk in the hot sand and prevent the heat. They have a hump to store food in the desert for many days. The camel dung is dry and devoid water. All these helps them to conserve water to enable to live several days.
b) HOW CAN THE PLANTS LIKE CACTUS AND ACACIA LIVE IN DESERTS WITH SCARCE WATER?
ANS:- Cactus and acacia live in the deserts with scarce of water. They are either leafless or their leaves are small neddles or modified into thorns. For this they lose very little water by evaporation. The stem stores water and food and so therefore fleshy. The stems are green as they perform photosynthesis in the absence of leaves. Their roots are deep into the soil and some roots spread away into the soil in search of water.
C) WHAT IS THE INTER RELATIONSHIP BETWEEN ADAPTATIONS OF ORGANISMS AND THEIR SURROUNDINGS?
ANS:- Adaptation is the change in the organisms body that helps to survive in a particular environment. The environment animal survive consists of many different things. Everything help in life process of an organism constitutes its environment. An organism cannot exist in vaccum. An organism is a biotic component of the environment. Life is the energy exchange process between the organisms and environment.
D) HOW ARE ORGANISMS CLASSIFIED?
ANS:- It is difficult to study and remember all the organisms in this diverse lying world at the same time . Different scientists have used different criteria and independently classified plants and animals. A hierarchy is formed in the classification that starts with kingdom Animalia or Kingdom Planta. According tothis system kingdom is the highest rank. It is divided into some divisions where species is the basic unit of classification.
Kingdom>Phylum> Class> Order> Family> Genus> Species.
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