Head is reduced into single flower is
 1) Tridax
 2) Launea
 3) Helianthus
 4) Echinops

Chromosomes with median centromere and equal arms are termed

(1) Telocentric

(2) Acentric

(3). Metacentric

(4) Submetacentric

The characteristic features of the mangrove vegetation is the possession of
1. large air spaces
2. velamen
3. storage roots
4. pneumatophores

The primary egg membrane of mammals is
 1) Corona radiata
 2) Chorion
 3) Jelly envelope
 4) Zona pellucida

The oxygen produced in photosynthesis comes from what molecule?
 1) glucose
 2) water
 3) P680
 4) ATP

Which of the following statement are wrong?
 a) Cholesterol is a derived lipid and wax is a simple liquid.
 b) Sodium is essential for conduction of nerve impulse and maintenance of ionic balance.
 c) Potassium maintains acid-base balance.
 d) Magnesium is essential for the regulation of osmotic pressure.
 1) a,c only
 2) a,d only
 3) b,d only
 4) a,b only

The adult Wuchereriabancrobti worms live
 1) In the digestive system of man
 2) In the lymphatic system of man
 3) In the respiratory track of man
 4) In the kidney of man

 Which one of the following represents epistasis ?

(1) Coat colour in mice            (2) ABO blood grouping

(3) Sickle cell anaemia             (4) White eyed Drosophila

 1. Bryophytes play an important role in plant succession on bare rocks or soil.
2. The plant body of bryophytes is more differentiated than that of algae. Regarding 1 and 2 :

1) 1 is incorrect but 2 is correct
2 ) Both are incorrect
3 ) Both are correct
4 ) 1 is correct but 2 is incorrect

 If thyroid gland is ,completely removed from a tadpole, it will-

(1) Remain tadpole throughout its life

(2) Die immediately

(3) Turn into a giant frog

(4) Turn into a dwarf frog