The entire space occupied by living organisms is termed as a biosphere. All organisms are adapted to their environment. A habitat is a place where organisms live.
Adaptation is defined as the process of adjustment of an organism to its environment. Organisms show the adaptation in the following ways:
Aquatic plants (Hydrophytes) and their adaptational characteristics
The plants which grow, derive food, multiply and adjust themselves inside water are called aquatic plants. On the basis of mode of life, hydrophytes are of following types:
The following are the adaptational characteristics of hydrophytes:
Aquatic animals and their adaptational characteristics
Examples: fish, frog, duck etc.
The development of certain features in response to the particular environment which may improve the chances of survival is called adaption.
Aquatic plants are called hydrophytes. They are of mainly three types:
a) Free floating plants
b) Submerged plants
c) Water fixed plants
Organisms show adaption in the following ways:
a) By changing the color of the body according to the habitat.
b) By the modification of organs.
c) By losing and gaining of organs.
Any three adaptive features of aquatic animals are as follows:
a) They have a streamlined body which is spindle shaped.
b) The entire body is covered with water proof scales.
c) Gills are present on the lateral sides.
Three Adaptive features of aquatic plants (hydrophytes) are as follows:
a) Underdeveloped conducting tissues (xylem and phloem) are present.
b) The plants body covered with waxy substance.
c) The stems are long, soft and spongy.
The stem and leaves of hydrophytes are covered with waxy substances to present them from rotting and decaying.
One adaptational character of water hyacinth is its steam and leaves are coated with waxy substances.
Any two adaptational characteristics of a fish to live in water are as follows:
a) The body is covered with water proof scales.
b) Gills are present on the lateral sides.
Aquatic animals possess air sacs in their body because it helps in respiration, sound production and they do not sink when they stop swimming.
Aquatic plants have large air sacs in them because the air sacs make the plants lighter to float.
Two adaptational features of animals found on high altitudes or alpine region are as follows:
a) Their skin is thick and covered with long hair.
b) They have strong and short legs.
A cow is well adapted to dry and hot habitat. It has lighter colour so it feels less heat.
Any two characteristics of terrestrial animals are:
i) The legs and phalanges of terrestrial animals are modified according to their prey habit, habitat and climate.
ii) The animals of cold climate possess thick skin and long hairs and furs but of hot climate they have skin and short hairs.
Organism survives in low freezing temperature by the following ways:
i) The organism seen at low temperature are white coloured which helps them in thermal regulation and in camouflage.
ii) These animals eat a lot during summer and autumn to store energy in the form of fat so they simply get for winter sleep during winter.
iii) The plants on cold region are short in height and bear narrow leaves.
The plants which grow, derive food, multiply and adjust themselves inside water are called ______.
None of these
Both of these