biodiversity- animals

Question 1

bilateral symmetry

Answer 1

Animals having only one imaginary line that can divide them along the long axis to produce two halves that are mirror images. Therefore such animals have right and left sides, a distinct head end (anterior), a distinct tail end (posterior), an upper surface (dorsal) and a lower surface (ventral). Also applied to flower shapes.

Question 2

radial symmetry

Answer 2

Animal in which division in any longitudinal plane will divide the body into two equal halves. Also applied to flower shapes.

Question 3

hydrostatic skeleton

Answer 3

hydrostatic skeleton
Fluid-filled, constant volume cavity that permits muscles to be re-stretched after contraction.

Question 4

exoskeleton

Answer 4

exoskeleton
Skeleton on the outside of an animal, with the muscle attachments on the inside.

Question 5

endoskeleton

Answer 5

an internal skeleton, such as the bony or cartilaginous skeleton of vertebrates.

Question 6

closed circulatory system

Answer 6

Blood is confined within blood vessels and does not mix directly with fluids surrounding the cells.

Question 7

open circulatory system

Answer 7

It is primarily found in invertebrates. Here, the blood flows freely through cavities since there are no vessels to conduct the blood.

Question 8

metamerism

Answer 8

Segmentation of the body. Occurs in annelids, arthropods and chordates.