MCQ
In man, blood passes from the post caval into the diastolic right atrium of the heart because of:
- APushing of venous valves
- BSuction pull
- ✓Beating of $SA$ node
- DPressure difference between post caval and atrium
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| List $- I$ | List $- II$ |
| $(a)$ Scapula | $(i)$ Cartilaginous joints |
| $(b)$ Cranium | $(ii)$ Flat bone |
| $(c)$ Sternum | $(iii)$ Fibrous joints |
| $(d)$ Vertebral column | $(iv)$ Triangular flat bone |
Choose the correct answer from the options given below.
$(a)- (b) -(c) -(d)$
$(a)$ Metagenesis is observed in Helminths.
$(b)$ Echinoderms are triploblastic and coelomate animals.
$(c)$ Round worms have organ-system level of body organization.
$(d)$ Comb plates present in ctenophores help in digestion.
$(e)$ Water vascular system is characteristic of Echinoderms.
Choose the correct answer from the options given below.