981. Vacuoles are fluid filled sacs surrounded by a membrane called__________?
✅ A. tonoplast
Option A: tonoplast Option B: nuclear membrane Option C: cell membrane Option D: cell wall Correct Answer : tonoplast Read more
Biology MCQs – Page 50
982. During the process of cell division which of the following divides first?
✅ D. nucleus
Option A: cytodplasm Option B: vacuoles Option C: mitochondria Option D: nucleus Correct Answer : nucleus Read more
983. Which of the following manufactures carbohydrates by the process of photosynthesis?
✅ A. chloroplast
Option A: chloroplast Option B: chromoplast Option C: leucoplast Option D: All of these Correct Answer : chloroplast Read more
984. Diatomaceous earth is used for making __________?
✅ D. Fire proof bricks
Option A: Fertilizers Option B: Weedicides Option C: Insecticides Option D: Fire proof bricks Correct Answer : Fire proof bricks Read more
985. Diatoms stay afloat due to___________?
✅ B. Stored lpids
Option A: Flagella Option B: Stored lpids Option C: Pseudopodia Option D: All of these Correct Answer : Stored lpids Read more
986. Cell wall is richly impregnated with silica in__________?
✅ C. Baciliariophyta
Option A: Rhodophyta Option B: Phaeophyta Option C: Baciliariophyta Option D: Euglenophyta Correct Answer : Baciliariophyta Read more
987. The cell wall is usually composed of two overlapping halves called epitheca and hypotheca in__________?
✅ A. Diatoms
Option A: Diatoms Option B: Desmids Option C: Pyrrophyta Option D: Chlorophyta Correct Answer : Diatoms Read more
988. Unlike other algae, diatoms do not readily decay due to___________?
✅ B. Siliceous wall
Option A: Nonliving cells Option B: Siliceous wall Option C: Mucilaginous wall Option D: Water proof cell Correct Answer : Siliceous wall Read more
989. Cell wall is extremely well preserved in fossil specimens in__________?
✅ A. Diatoms
Option A: Diatoms Option B: Dinoflagellates Option C: Slime moulds Option D: None of these Correct Answer : Diatoms Read more
990. Empty diatom cells are called___________?
✅ C. Frustule
Option A: Raphe Option B: Valves Option C: Frustule Option D: Girdles Correct Answer : Frustule Read more
991. Diatom frustule/ shell is made of_____________?
✅ A. Silica
Option A: Silica Option B: Calcium carbonate Option C: Manesium carbonate Option D: Both Correct Answer : Silica Read more
992. The chloroplasts of diatoms and chrysophycean algae do not possess____________?
✅ C. Defined grana and stroma
Option A: Chloryphyllpigments Option B: Enzymes for photolysis Option C: Defined grana and stroma Option D: Carotenes with chlorophylls Correct Answer : Defined grana and stroma Read more
993. Oil body is found in the cells of___________?
✅ A. Diatoms
Option A: Diatoms Option B: Slime moulds Option C: Chlorophycean forms Option D: None of the these Correct Answer : Diatoms Read more
994. The wax present on the body of cockroach is secreted:
✅ C. Oenocytes
Option A: Mucocytes Option B: Leucocytes Option C: Oenocytes Option D: Granulocytes Correct Answer : Oenocytes Read more
995. Which organisms are sometimes called the pastures of the sea?
✅ A. Diatoms
Option A: Diatoms Option B: Radiolarians Option C: Dinoflagellates Option D: Foraminiferans Correct Answer : Diatoms Read more
996. Diatoms belong to___________?
✅ B. Bacillariophyceae
Option A: Chrysophyta Option B: Bacillariophyceae Option C: Xanthophyceae Option D: Both A. and B. Correct Answer : Both and B. Read more
997. Which one of the following is representing the group of diatoms?
✅ A. Pinnularia, Navicula, Cymbella, Melosira
Option A: Pinnularia, Navicula, Cymbella, Melosira Option B: Euglenamorpha, Hedneria , Heteronema, Colacium Option C: Nostoc, Anabaena, Aulosira, Cylindrospermum Option D: Cochlodinium, Gymnodinium, Lenodinium, Peridinium Correct Answer : Pinnularia, Navicula, Cymbella, Melosira Read more
998. Diatoms are found in__________?
✅ D. All of the above
Option A: Phytoplanktonic population Option B: Freshwater lakes and ponds Option C: Marine environment Option D: All of the above Correct Answer : All of the above Read more
999. Centric discoid form of diatoms is__________?
✅ B. Coscinodiscus
Option A: Diplaneis Option B: Coscinodiscus Option C: Camphyloneiscus Option D: Stephanodis Correct Answer : Coscinodiscus Read more
1000. Microfossile often present in petroleum producing formationsare those of__________?
✅ A. Diatioms
Option A: Diatioms Option B: Heliozoans Option C: Radiolarians Option D: Foraminiferans Correct Answer : Diatioms Read more