12th class (Fsc) Biology unit 1 MCQs
chapter 1 MCQs 12th Class Biology
Homeostasis:
1. The environment where the animal produce large volumes of diluted urine:
a. Hypertonic aquatic
b. Hypotonic aquatic
c. Terrestrial
d. Isotonic aquatic
2. The protection of an internal environment from the harms of fluctuations is the definition of which of the following?
a. Thermoregulation
b. Osmoregulation
c. Homeostasis
d. Excretion
3. A diluted solution compared to the cell concentration is termed as:
a. Isotonic
b. Hypertonic
c. Paratonic
d. Hypotonic
4. The more concentrated external environment is termed as:
a. Isotonic
b. Hypotonic
c. Osmotic
d. Hypertonic
5. Animals inhibiting environment with acute shortage water excrets:
a. Urea
b. Ammonia
c. Allantion
d. Uric acid
6. Mechanism, which eliminates nitrogenous waste, is referred as:
a. Thermoregulation
b. Osmoregulation
c. Ejection
d. Excretion
7. The category of the plants that has adaptations of small and thick leaves to limit water loss are called:
a. Mesophytes
b. Hydrophytes
c. Hygrophytes
d. Xerophytes
8. Which one is an example of xerophytes?
a. Mango
b. Brassia
c. Cactus
d. Rose
9. Which one is not a mesophyte?
a. Mango
b. Brassica
c. Cacti
d. Rose
10. A plant is adapted to remove the floading of its cells in fresh water:
a. Hyrdrophytes
b. Mesophytes
c. Xerophytes
d. Cactus
11. They have adaptations for reduced rate of transpiration:
a. Hydrophyte
b. Mesophyte
c. Xerophyte
d. Halophytes
12. Contractile vacuoles are found in:
a. Terrestrial animals
b. Plants
c. Marine plants
d. Fresh water protozoa
13. Tri ethylamine oxide is produced in:
a. Marine fish
b. Hag fish
c. Cartilaginous
d. Bony fish
14. The tolerance of dehydration is called:
a. Anhydrobiosis
b. Osmoconformers
c. Dehydration
d. Osmoregulation
15. Animals that do not require to adjust their internal environment state actively are known:
a. Terrestrial
b. Osmoregulation
c. Hypertonic
d. Osmo conformers
16. Fresh water protozoans pump out excess water by:
a. Pinocytosis
b. Contractile vacuole
c. Phagocytosis
d. Food vacuole
17. Among the vertebrates, hag fish are isotonic with the surrounding:
a. Pound water
b. Fresh water
c. River water
d. Sea water
18. The fishes which drink large amount of sea water and excrete concentrated urine are:
a. Lung fishes
b. Cartilaginous fishes
c. Jawless fishes
d. Bony fishes
19. Fresh water flatworms excrete:
a. Slightly concentrated urine
b. Very dilute urine
c. Moderately concentrated urine
d. Very concentrated urine
20. Which of the following is called as excretophore i.e. contributing mainly in the elimination of wastes in plants?
a. Leaves
b. Stem
c. Flowers
d. Roots
21. Which part of the plant body serves as excretophore?
a. Leaves
b. Root
c. Flowers
d. Stem
22. The excretory product that requires minimum water for its elimination compare in others:
a. Creatinine
b. Urea
c. Ammonia
d. Uric acid
23. 1 g of ammonia nitrogen requires how much water for excretion:
a. 250 ml
b. 50 ml
c. 500 ml
d. 100 ml
24. Urea is detoxified form of ……… in the area cycle which can be retained in the body.
a. Uric acid
b. Ammonia
c. CO2
d. Nitrogen
25. Animals excreting urea are called:
a. Uretelic
b. Ammonotelic
c. Uricotelic
d. Aminotelic