Sign Up to our social questions and Answers Engine to ask questions, answer people’s questions, and connect with other people.
Login to our social questions & Answers Engine to ask questions answer people’s questions & connect with other people.
Lost your password? Please enter your email address. You will receive a link and will create a new password via email.
Please briefly explain why you feel this question should be reported.
Please briefly explain why you feel this answer should be reported.
Please briefly explain why you feel this user should be reported.
How many species are present in class Amphibia? Make a list of its members. What may be the reason that they are partially successful although they can also live on land?
The class Amphibia includes about 6771 species. It includes animals like frogs, toads, salamanders and caecilians. They were the first group of vertebrates that have ventured to live on land from water. They were partially successful as the adults have to come back to water for reproduction.
The class Amphibia includes about 6771 species. It
See lessincludes animals like frogs, toads, salamanders and
caecilians. They were the first group of vertebrates that
have ventured to live on land from water. They were
partially successful as the adults have to come back to
water for reproduction.
Could the number of eggs or young ones produced by an oviparous and viviparous mother be equal? Why?
An oviparous animal always produces more number of eggs than the young ones produced by a viviparous animal. This is because their eggs are exposed to external environment and predators and they have to pass through a large number of developmental stages before becoming an adult. Hence, they face leRead more
An oviparous animal always produces more number of
See lesseggs than the young ones produced by a viviparous
animal. This is because their eggs are exposed to external
environment and predators and they have to pass
through a large number of developmental stages before
becoming an adult. Hence, they face less chances of
survival than the foetus developing inside the mother’s
body. The large number of eggs compensates the
inevitable loss and ensures the continuation of race.
What are the modifications observed in birds that help them to fly?
Flight adaptations found in birds (i) Body is streamlined to reduce air resistance during flight. (ii) Forelimbs are modified into wings, (iii) Wings have long quill feathers to increase the efficiency of beating of wings. (iv) Pneumatic bones are present to reduce the body weight. (v) High metaboliRead more
Flight adaptations found in birds
See less(i) Body is streamlined to reduce air resistance during
flight.
(ii) Forelimbs are modified into wings,
(iii) Wings have long quill feathers to increase the
efficiency of beating of wings.
(iv) Pneumatic bones are present to reduce the body weight.
(v) High metabolic rate to provide energy for flight.
(vi) Air sacs present in lungs help in double respiration.
List out any six general features of cartilaginous fishes.
Features of cartilaginous fishes (i) Cartilaginous endoskeleton is present. (ii) These are mostly marine, poikilothermic animals. (iii) Notochord is persistent throughout the life. (iv) Placoid scales are present. (v) Heart is two-chambered with one auricle and one ventrical. (vi) Tail fin is alwaysRead more
Features of cartilaginous fishes
See less(i) Cartilaginous endoskeleton is present.
(ii) These are mostly marine, poikilothermic animals.
(iii) Notochord is persistent throughout the life.
(iv) Placoid scales are present.
(v) Heart is two-chambered with one auricle and one
ventrical.
(vi) Tail fin is always heterocercal.
Mention two similarities between (i) Aves and mammals (ii) A frog and crocodile (iii) A turtle and Pila
(i) Aves and mammals are homeothermal and have extra embryonic membranes. (ii) Frog and crocodile are cold-blooded and are tetrapods. (iii) A turtle and Pila have hard covering over the body and are cold-blooded animals.
(i) Aves and mammals are homeothermal and have extra
See lessembryonic membranes.
(ii) Frog and crocodile are cold-blooded and are
tetrapods.
(iii) A turtle and Pila have hard covering over the body
and are cold-blooded animals.
Justify 'snakes have strong sense of smell'.
Snakes have strong sense of smell because, their forked tongue is frequently linked to pick up smell bearing molecules from the air or ground and are inserted with special sense organs called Jacobson's organs in the roof of the mouth to identify the smell.
Snakes have strong sense of smell because, their forked
See lesstongue is frequently linked to pick up smell bearing
molecules from the air or ground and are inserted with
special sense organs called Jacobson’s organs in the roof
of the mouth to identify the smell.
How will you differentiate between the heart Of an amphibian and a reptile?
In both amphibians and reptiles, heart is three-chambered with two auricles and one ventricle Ventricle is unpartitioned in the amphibians, while it IS incompletely partitioned in the reptiles.
In both amphibians and reptiles, heart is
See lessthree-chambered with two auricles and one ventricle
Ventricle is unpartitioned in the amphibians, while it IS
incompletely partitioned in the reptiles.
Why mammals are considered more intelligent as compared to other animals?
In mammals, brain is well-developed with large sized cerebrum, four optic lobes and a nervous band called corpus callosum. Grey matter is more developed which makes them more intelligent among all other animals .
In mammals, brain is well-developed with large sized
See lesscerebrum, four optic lobes and a nervous band called
corpus callosum. Grey matter is more developed which
makes them more intelligent among all other animals .
Why birds are called warm-blooded animals? How does this help them?
Birds are warm-blooded or homeothermal animals as they are able to maintain constant body temperature. This helps them to maintain high metabolic rate for quick energy supply for flight.
Birds are warm-blooded or homeothermal animals as
See lessthey are able to maintain constant body temperature.
This helps them to maintain high metabolic rate for
quick energy supply for flight.
How do the appendages support the bird's body?
Birds have two pairs of limbs, forelimbs are modified into wings for flight. The wings are powered by the powerful flight or breast muscles attached to the large sternum of breast bone. Hindlimbs support the body and used for grasping. perching, wading and swimming.
Birds have two pairs of limbs, forelimbs are modified into
See lesswings for flight. The wings are powered by the powerful
flight or breast muscles attached to the large sternum of
breast bone. Hindlimbs support the body and used for
grasping. perching, wading and swimming.