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chapter name: diversity in living organisms
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1. Characteristics of Pisces :
They are found in fresh, marine, and brackish water.
The body is usually streamlined. Some have a spindle-shaped or elongated body as well.
Their body is distributed into a head, trunk and tail.
They swim with the help of their tail.
Paired and unpaired fins represent the appendages. These help the fish to balance while swimming.
The lateral line system functions as a sensory organ to sense the disturbances in the nearby environment.
The body is covered with thick-seated scales, which helps by providing protection to the internal organelles.
The gills help in respiration.
Closed type blood circulation is observed.
The internal skeleton is bony or cartilaginous.
These are cold-blooded organisms.
They may be herbivores or carnivores, oviparous or ovoviviparous.
The sexes are separate.
Fertilization may be external or internal.
They lack extra-embryonic membranes.
The digestive system is well-developed.
The nervous system comprises of the brain and ten pairs of the cranial nerves.
2. As for us mammals, only two types lay eggs: the duck-billed platypus and the echidna
3. Taxonomy is the part of science that focuses on naming and classifying or grouping organisms. A Swedish naturalist named Carolus Linnaeus is considered the 'Father of Taxonomy' because, in the 1700s, he developed a way to name and organize species that we still use today.
4. (i) The generic name/genus should start with a capital letter. (ii) The species name should start with a small letter. (iii) The names should be underlined separately when written. (iv) When printing, the scientific name should be written in italics.