If a person having Rh-negative blood is given Rh-positive blood by mistake, it will stimulate formation of:
A. Rh-antigens.
B. blood clots.
C. Rh-antibodies.
D. None of them.
The breathing system of birds is efficient due to:
A. gills.
B. trachea.
C. air sacs.
D. book lungs.
Spiders can be distinguished from insects because they have:
A. two antennae.
B. eight legs.
C. jointed legs.
D. separated head, thorax and abdomen.
Besides calcium, the mammalian's skeleton also stores a huge amount of:
A. phosphorus.
B. sulfur.
C. iron.
D. nitrogen.
The pigment in blue-green algae that distinguishes them from other algae is:
A. chlorophyll a.
B. phycobillin.
C. chlorophyll b.
D. xanthophylls.
An example of discontinuous variation is reflected by:
A. height.
B. intelligence.
C. blood group.
D. weight.
Flytraps in two pitcher plants ?Sundew and Venus ?are similar in that they both:
A. are saprophyte.
B. trap insects.
C. are symbiotic.
D. lack chlorophyll.
Which of following is mostly likely the result of large scale destruction of forests?
A. Increase in air humidity
B. Decrease in floods
C. Increase in soil erosion
D. Decrease in carbon dioxide
The amount of lactic acid in muscles rises when they start lacking:
A. carbon dioxide.
B. oxygen.
C. glucose.
D. hydrogen carbonate.
The enzymes in pancreatic juice digest:
A. carbohydrates and proteins only.
B. carbohydrates and proteins only.
C. fats and proteins only.
D. carbohydrates, proteins and fats.
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