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Biology O level MCQs Questions Answers
Q.1: The distal blind end of the malpighian tubules bathes freely in——?
- Digestive tract
- Intestines
- Haemocoel
- Coelom
C
Q.2: Which of the following is a sentimentally arranged excretory system?
- Protonephridium
- Metanephridium
- Malpighian tubules
- Nephrons
B
Q.3: Excessive lactic acid is converted into —– by liver?
- Glucose
- Fructose
- Sucrose
- Glycogen
D
Q.4: Each human kidney receives —-% of total cardiac out put?
- 10%
- 20%
- 30%
- 40%
B
Q.5: On which of the following site the posterior pituitary hormone acts predominantly?
- Proximal convoluted tubule
- Descending limb of loop of Henle
- Ascending limb of loop of Henle
- Collecting tubules
D
Q.6: Animals that produce metabolic heat at low level and also absorb heat from the surroundings are called—–?
- Endotherms
- Ectotherms
- Heterotherms
- Homeotherms
C
Q.7: Which of the following marine fishes are considered direct descendents of fresh water ancestors?
- Hagfish
- Jelly Fish
- Star Fish
- Bony fishes
D
Q.8: Which excretory product in produced in plants during autotrophic mode of life?
- CO2
- H2O
- O2
- Both A and B
C
Q.9: Which of the following statement about conifers is correct?
- Stored excretory products in vacuoles, at a concentration that leads to crystal formation.
- Accumulate waste in leaves, which fall in autumn.
- Production of black wood in the center.
- Excrete some of the waste materials directly into soil, occasionally using them as a chemical weapon against other competing plants.
D
Q.10: Purine and pyrimidine metabolism results in production of——?
- Creatinine
- Trimethyamine oxide
- Xanthine
- None of these
C