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Chapter 4 Animal Kingdom Solutions

Question - 11 : -
What are the modifications that are observed in birds that help them fly?

Answer - 11 : -

The birds are adopted for flying by reducing the weight and other modifications which are as follows :
(i) The fore limb modified into wings to assist in flight.
(ii) Left ovary absent or reduced
(iii) Presence of pneumatic or hollow bones for making a light weight skeleton.
(iv) Aerodynamic body helps in flying.
(v) Excretion of urine and faeces occurs through single opening.

Question - 12 : -
Could the number of eggs or young ones produced by an oviparous and viviparous mother be equal? Why?

Answer - 12 : -

The number of eggs given by oviparous and young ones given by viviparous animals are not v equal because the egg laying animals lay-more eggs to resist the environmental forces for survival so that the population remains constant or not declining while the viviparous animals nurture their young ones and give birth to less number of offsprings as parental care is shown in fhe viviparous animals.

Question - 13 : -
13. Segmentation in the body is first observed in which of the following:
(a) Platyhelminthes
(b) Aschelminthes
(c) Annelida
(d) Arthropoda

Answer - 13 : -

(c) Annelida.

Question - 14 : -
Match the following:
(a) Operculum           (i) Ctenophora
(b) Parapodia            (ii) Mollusca
(c) Scales                  (iii) Porifera
(d) Comb plates        (iv) Reptilia
(e) Radula                 (v) Annelida
(f) Hair                       (vi) Cyclostomata and Chondrichthyes
(g) Choanocytes        (vii) Mammalia
(h) Gill slits                 (viii) Osteichthyes

Answer - 14 : -

(a) Operculum                      (viii) Porifera
(b) Parapodia                      (v) Annelida
(c) Scales                            (iv) Reptilia
(d) Comb Plates                  (i) Ctenophora
(e) Radula                           (ii) Mollusca
(f) Hair                                 (vii) Mammalia
(g) Choanocytes                  (iii) Porifera
(h) Gill slits                         (v) Cyclostomata and Chondrichthys

Question - 15 : -
Prepare a list of some animals that are found parasitic on human beings.

Answer - 15 : -

(i) Porktape worm solium
(ii) Faciola hepatica (liver fluke)
(iii) Schistosoma (blood fluke)
(iv) Wuchereria bancrafti (filarial worm)
(v) Ancylostoma duodenale (hook worm)
(vi) Ascaris lumbricoides (The giant intestinal roundworm)
(vii) boa loa (eyewonn)
(viii) Trichinella spiralis (trichinia worm)

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