Consider following statements (a-e) each with one or two blanks.

a. Lactobacillus promotes curdling of milk by creating a ___(1)___ environment.
b. Vaccines employ use of ___(2)___. They give protection against ___(3)___ diseases.
c. The ___(4)___ Anopheles mosquitoes are carriers of malaria and dengue is spread by ___(5)___ Aedes mosquito.
d. The crops that require more water for growth and are sown in month of June are called ___(6)___ crops, while those that require less water for growth and are grown during winter season are called ___(7)___ crops.
e. Manual scattering of seeds in field is called ___(8)__.

Select correct option to fill any four or five blanks.