The nature of skin in four classes of tetrapoda are: (i) Class Amphibia - Thin, moist, glandular and respiratory skin. (ii) Class Reptilia - Dry and non-glandular skin with horny scales or scutes. (iii) Class Aves - Dry and non-glandular skin with feathers. (iv) Class Mammalia - Glandular skin withRead more
The nature of skin in four classes of tetrapoda are:
(i) Class Amphibia – Thin, moist, glandular and respiratory skin.
(ii) Class Reptilia – Dry and non-glandular skin with horny scales or scutes.
(iii) Class Aves – Dry and non-glandular skin with feathers.
(iv) Class Mammalia – Glandular skin with hairs.
Notochord is a transient mesodermal rod in the most dorsal portion of the chordate embryo. In other words, notochord is an ensheathed flexible rod of turgid cells located along the back of chordate embryos and some primitive chordates ventral to nerve cord. It provides place for the attachment of muRead more
Notochord is a transient mesodermal rod in the most dorsal portion of the chordate embryo. In other words, notochord is an ensheathed flexible rod of turgid cells located along the back of chordate embryos and some primitive chordates ventral to nerve cord. It provides place for the attachment of muscles. Notochord has given rise to jointed axial skeleton of vertebral column. Nente cord is a collection of nerve fibres that runs throughout the length of an animal. It is hollow and dorsal in chordates where it gets modified into central nervous system of brain and spinal cord. Nerve cord is solid and ventral in nonchordates.
Differentiate the nature of skin in four-classes of tetrapoda.
The nature of skin in four classes of tetrapoda are: (i) Class Amphibia - Thin, moist, glandular and respiratory skin. (ii) Class Reptilia - Dry and non-glandular skin with horny scales or scutes. (iii) Class Aves - Dry and non-glandular skin with feathers. (iv) Class Mammalia - Glandular skin withRead more
The nature of skin in four classes of tetrapoda are:
See less(i) Class Amphibia – Thin, moist, glandular and respiratory skin.
(ii) Class Reptilia – Dry and non-glandular skin with horny scales or scutes.
(iii) Class Aves – Dry and non-glandular skin with feathers.
(iv) Class Mammalia – Glandular skin with hairs.
In what way, amphibians are advanced than the fishes?
Amphibians have three-chambered heart and lungs for respiration, while fishes have two-chambered heart and gills for respiration.
Amphibians have three-chambered heart and lungs for respiration, while fishes have two-chambered heart and gills for respiration.
See lessGive one point of difference between notochord and nerve cord.
Notochord is a transient mesodermal rod in the most dorsal portion of the chordate embryo. In other words, notochord is an ensheathed flexible rod of turgid cells located along the back of chordate embryos and some primitive chordates ventral to nerve cord. It provides place for the attachment of muRead more
Notochord is a transient mesodermal rod in the most dorsal portion of the chordate embryo. In other words, notochord is an ensheathed flexible rod of turgid cells located along the back of chordate embryos and some primitive chordates ventral to nerve cord. It provides place for the attachment of muscles. Notochord has given rise to jointed axial skeleton of vertebral column. Nente cord is a collection of nerve fibres that runs throughout the length of an animal. It is hollow and dorsal in chordates where it gets modified into central nervous system of brain and spinal cord. Nerve cord is solid and ventral in nonchordates.
See lessGive one example of hemichordata, urochordata and cephaloechordata.
(i) Hemichordata - Balanoglossus (ii) Urochordata - Herdmania (ii) Cephalochordata - Amphioxus (Branchiostoma)
(i) Hemichordata – Balanoglossus (ii) Urochordata – Herdmania
See less(ii) Cephalochordata – Amphioxus (Branchiostoma)
Define phylogeny.
Phylogeny is ancestry of an organisms i.e., evolutionary history of an organism.
Phylogeny is ancestry of an organisms i.e., evolutionary history of an organism.
See less