• Biology - Section 1
21. 

Other than spreading malaria, anopheles mosquitoes are also vectors of

A. dengue fever
B. filariasis
C. encephalitis
D. yellow fever

22. 

Plants that grow in saline water are called

A. halophytes
B. hydrophytes
C. mesophytes
D. thallophytes

23. 

Pyorrhoea is a disease of the

A. nose
B. gums
C. heart
D. lungs

24. 

Primary phloem develops from

A. lateral meristem
B. protoderm
C. extrastelar cambium
D. provascular tissue

25. 

Placenta is the structure formed

A. by the union of foetal and uterine tissue
B. by foetus only
C. by fusion of germ layers
D. None of these