Question

Explain the following terms

i) Bilateral symmetry

ii) Triploblastic

iii) Diploblastic

iv) Radial symmetry

v) Open circulatory system

...........please answer it fast..................​

Answer 1

Answer:

1.Bilateral symmetry is a form of symmetry in which the opposite sides are similar. The external appearance is the same on the left and right sides in a sagittal plane (such as the body plan of most animals, including humans).

2.Triploblastic: The animals having three primary embryonic cell layers viz., the ectoderm, mesoderm and endoderm from which different tissues and organs of the animal's body differentiate out. Example: Frog.

3.Diploblastic animals have two germinal layers (ectoderm and endoderm) during embryonic development, e.g., poriferans.

4.Radial symmetry is a symmetry in which the sides exhibit correspondence or regularity of parts around a central axis. It is lacking left and right sides. It is in contrast to bilateral symmetry that is more common than radial symmetry

5.Open circulatory systems (evolved in insects, mollusks and other invertebrates) pump blood into a hemocoel with the blood diffusing back to the circulatory system between cells. Blood is pumped by a heart into the body cavities, where tissues are surrounded by the blood

Answer 2

Explanation:

i ) the property of being divisible into symmetrical halves on either side of unique plane.

ii ) it is a condition in gastrula in which, there are 3 primary germ layer : ectoderm, mesoderm and endoderm.

iii ) it is a condition in blastula which, there is 2 primary germ : endoderm and ectoderm.

iv ) the condition of having similar parts regularly arranged around the central axis.

v ) A type of circulatory system wherein the hemolymph bathes the organs and tissues directly thus there is no distinction between blood and interstitial fluid.

Hope this is help you