Biology 2nd Paper MCQ-Sylhet Board-2021

1. Number of gill slits in Chondrichthyes, are-

2. Radula is present in -

i. Octopus

ii. Leech

iii. Pila

Which one is correct?

3. Who put forth the 'theory of natural selection'?

4. Which ratio is appropriate for duplicate recessive epistasis?

5. $\mathrm{X} \xrightarrow{\text { I.ypase }} \mathrm{Y}+\mathrm{Z}$

' $X$ ' of the stem is -