Question

1. Listed below are eleven characteristics (i-xi) in Column I and the five classes (a-e) of Chordata in Column II. Match at least two characteristics with each class. Column 1 Column II (Characteristics) (Classes) (1) Three chambered heart (a) Pisces (ii) Feathers (ii) Two-chambered heart (iv) Eardrum in a pit (b) Amphibia (v) Scales (vi) External ears (vii) Gills (c) Reptilia (vii) Moist skin (ix) Homy scales on skin (x) Homeothermal (d) Aves (xi) Testes in scrotum (e) Mammalia​

Answer 1

Answer:

Explanation:

Two chambered heart = pisces.

Three chambered heart = most amphibians and reptiles.

Answer 2

Answer:

2y^3+y^2-2y-1

let p(y) = 2y^3+y^22y^3+y^2-2y-1

By trial,we find that

p(1)=2(1)^3+(1)^2-2(1)-1

= 2 + 1 - 2 -1=0

By factor theorem,(y -1)is a factor of p(y)

Now

2y^3+y^22y^3+y^2-2y-1

= 2x^2(y-1) +3y(y-1)+1(y-1)

= (y-1) (2y^2+3y+1)

= (y-1) (2y^2+2y+1)

= (y-1) (2y(y+1) +1 (y+1))

= (y-1) (y+1) (2y+1).