Cell wall is extremely well preserved in fossil specimens in__________?
(A) Diatoms
(B) Dinoflagellates
(C) Slime moulds
(D) None of these
Unlike other algae, diatoms do not readily decay due to___________?
(A) Nonliving cells
(B) Siliceous wall
(C) Mucilaginous wall
(D) Water proof cell
The cell wall is usually composed of two overlapping halves called epitheca and hypotheca in__________?
(A) Diatoms
(B) Desmids
(C) Pyrrophyta
(D) Chlorophyta
Cell wall is richly impregnated with silica in__________?
(A) Rhodophyta
(B) Phaeophyta
(C) Baciliariophyta
(D) Euglenophyta
Microfossile often present in petroleum producing formationsare those of__________?
(A) Diatioms
(B) Heliozoans
(C) Radiolarians
(D) Foraminiferans
Centric discoid form of diatoms is__________?
(A) Diplaneis
(B) Coscinodiscus
(C) Camphyloneiscus
(D) Stephanodis
Diatoms are found in__________?
(A) Phytoplanktonic population
(B) Freshwater lakes and ponds
(C) Marine environment
(D) All of the above
Which of the following organ is responsible for blood filtration:
(A) Liver
(B) Kidney
(C) Lungs
(D) Heart
Which one of these is a set of useful insects?
(A) Sandfly , butterfly, hoeybee
(B) Sikmoth, honeybee, locust
(C) Honeybee, silkmoth, tsetse fly
(D) Honeybee , lac insect, cochineal insect