Hydrilla is an aquatic plant i.e. it lives in water. Function of roots is to fix the plant in the soil and to absorb water from the soil both these requirements get reduced in aquatic plants so hydrilla has got poorly developed roots. Its function is to hold the plant in its place against the water currents.

Deer is a plant eating animal living in the grassland. To hear even minute noise it has long ears to protect itself from its predator, also for the same reason, it has the legs well suited to run fast. It has got the side eyes orgain to see that its predator does not catch it. Strong teeth cannot help the deer to escape predators. As it is plant eating, so it does not need to tear the skin of prey.

Different animals and plants have habitant in different regions depending upon their body structure and adaptability. E.g. animals like Yak, Lions, ants live on ground and are known as terrestrial animals. Animals like fish, whales, sharks live in water and are known as aquatic animals crab is an animal which is generally found on the sea shores or beaches as it is neither completely terrestrial nor aquatic.

Lotus is generally seen growing on the surface of ponds which do not have fast water current.

Deer is a plant eating animal living in the grassland. To hear even minute noise it has long ears to protect itself from its predator, also for the same reason, it has the legs well suited to run fast. It has got the side eyes organ to see that its predator does not catch it. Strong teeth cannot help the deer to escape predators.

Hydrilla is an aquatic plant, i.e. it lives in water. Function of roots is to hold the plant in the soil and to absorb water from the soil. Since both these requirements get reduced in aquatic plants, so hydrilla has got poorly developed roots.

Aquatic plants are the plants living in water. These plants have to face the water current that is why their leaves are narrower and ribbon like so as they can easily bend against the water flow without being broken down. Conduction of water is the function of internal xylem tissue and has nothing to do with leaf structure.

Generally leaves and flowers of aquatic plants are found to float on water surface. This is because leaves have to prepare food in the presence of sunlight and to get the same, they remain on the surface.

Aquatic habitat refers to the water bodies. Cactus is a xerophytes i.e. desert plant, reindeer lives in the regions with lower temperature, pines on the mountain region. So it is the sea horse, water lilies and whales which all live in the water bodies and are thus belonging to aquatic animals.

There are some aquatic animals like squids, octopus etc. which do not have streamlined body. They stay deeper in the sea and catch any prey coming towards them. However they make their bodies shape streamlined when required.

Living organisms are those which move from one place to another, grow, respire, excrete, reproduce, show response towards stimulus and finally die after a certain age.

Earthworm is not a highly complex organism to have gills, lung or nostrils for respiration. Its cells are in contact with the absorphere directly so breathing in earthworm takes place through skin.

Gills are the organ of respiration in aquatic animals. Oxygen is present in dissolved form in water. Gills help these animals to absorb this dissolved oxygen in water. It is the fins in fish which act as balancer and a streamlined body to help in movement.

Frog is an animal which is both aquatic and terrestrial. To suit well towards both the environments, it has webbed feet i.e. fingers joined together so as to jump easily on the ground and move easily in water.

It is a characteristic features of living beings to respond towards the changes taking place in the surroundings. What ever are the changes in the surrounding that make living organisms to response are known as stimuli.

Lungs are the organs of respiration in highly complex organisms i.e. dogs, cows, cats, humans etc. Frog is an animal which respire through its skin when on land for the same it has got a wet and slimy skin to facilitate gaseous exchange.

Withdrawal of hand on touching hot body, closure of mimosa leaves on touching and movement away from bright light are all the examples of response to stimulus. But breathing is an action of body going continuously without waiting for any response and is involuntary.

The animals which lay eggs, for example, snakes, ostriches, frogs, crows, etc. are known as oviparous animals. On the other hand, the animals which directly give birth to young ones, for example, dogs, lions, deers and humans are known as viviparous animals.

There are some animals which lay eggs e.g. snake, ostrich, frog, crow etc are known as oviparous animals. On the other hand, there are animals which directly give birth to young ones like dog, lion, deer, and man and are known as viviparous animals.

Dolphins and Whales are the animals which neither have gills nor lungs to take in the air and to breathe for these animals come at the surface of water, absorb the oxygen from air through their nostrils and remain in water for longer by utilising this oxygen gradually.

Plants are the living organisms which stay fixed at one point, do not move as a whole from one place to another rather show differential movement of its parts like leaves, flower etc. food and water are being transported within the pant from one to another part. Flower is closed in the initial stage but opens out when grow fully. Stomata keeps on opening and closing depending upon the requirements.

So it is the respiratory system involved in the inhalation and exhalation of air.

So it is the respiratory system involved in the inhalation and exhalation of air. Whereas transpiration is loss of water from leaf surface and reproduction is a mode of giving birth to similar ones.

So it is the respiratory system involved in the inhalation and exhalation of air. Whereas transpiration is loss of water from leaf surface and reproduction is a mode of giving birth to similar ones.

Potato is a plant which grows vegetatively i.e. from part other than flower or seed. Potato grows from the eye on potato which develops into bud finally giving rise to new plant.