Give reasons for the following.
1 . Respiratory and circulatory system are absent in parasitic platyhelminthes and Aschelminthes.
2. Arthropods are the most successful invertebrate.
3. Body of endoparasites are covered with cuticle.

Which of the following relations are functions ? Give reasons. If it is a functions determine its domain and range. {(1,3),(1,5),(2,5)}

a. When energy of eleçtron is to be taken to zero? b. Which of the following orbitals are not possible? Give reasons 3 s, 1 p, 4 f, 2 d

Which of the following relations are functions ? Give reasons. If it is a functions determine its domain and range.{(2,1),(4,2),(6,3),(8,4),(10,5),(12,6),(14,7)}

Examine each of the following relations given below and state in each case, giving reasons whether it is a function or not? i) R={(2,1),(3,1),(4,2)} ii) R={(2,2),(2,4),(3,3),(4,4)} iii) R={(1,2) ,(2,3),(3,4),(4,5),(5,6),(6,7)}

Which of the following relations are functions? Give reasons. If it is a function, determine its domain and range. i) {(2,1),(5,1),(8,1),(11,1),(14,1),(17,1)} ii) { (2,1,(4,2),(6,3),(8,4),(10,5),(12,6),(14,7)} iii) {(0,0),(1,1),(1,-1),(4,2),(4,-2),(9,3)(9,-3),(16,-4), (16,-4)} iv) {(1, 2),(1,3),(2,5)} v) {(2,1),(3,1),(5,2)} vi) { (1,2),(2,2),(3,2)}