The flower shown above is
- A. complete, regular, hermaphroditic with superior ovary
- B. incomplete, regular, staminate with inferior ovary
- C. complete, regular, hermaphroditic with inferior ovary
- D. incomplete, irregular, pistillate with superior ovary
Which of the plants is likely to be desert species?
- A. U
- B. T
- C. S
- D. R
Which of the plants is likely to have broad leaves and thin cuticle
- A. R
- B. S
- C. T
- D. U
The process by which lime is added to clay soil is known as
- A. sedimentation
- B. flocculation
- C. leaching
- D. manuring
Nitrifying bacteria are important because they
- A. release nitrogen to the atmosphere
- B. convert atmospheric nitrogen to ammonia
- C. combine ammonia with nitrgen
- D. oxidize ammmonium salt to nitrates
One of the functions of UNICEF is to
- A. prevent and control major disease
- B. prevent diseases outbreak by administering vaccines
- C. improve the health and nutrition of children and nursing mothers
- D. monitir enviromental pollution
Poliomyelitis is an infectious diseases caused by
- A. virus
- B. protozoan
- C. bacterium
- D. fungus
Epiphytes growing on the branches of trees provide an example of the relationship known as
- A. parasitism
- B. commensalism
- C. saprophytism
- D. holophytism
Which of the following relates to edaphic factors?
- A. The structure of the earth's surface
- B. The influence of living organisms on each other
- C. Temperature, rainfall and humidity
- D. The influence of soils on plant and animals
In which of the following crosses will all the female offspring be colour blind?
- A. colour blind mother x colour blind father
- B. colour blind mother x normal father
- C. carrier mother x colour blind father
- D. carrier mother x normal father
The ratio of carriers to sicklers in the F1 generation derived from a parental cross of two carriers of haemoglobin S gene is
- A. 3 : 1
- B. 1 : 3
- C. 2 : 1
- D. 1 : 2
If a plant homozygous for round and yellow (RR : YY), is crossed with a wrinkle green type (rr : yy) all of the resulting seeds will be
- A. blue and wrinkled
- B. round and yellow
- C. wrinkled and yellow
- D. round and greenish yellow
An example of monohybride inheritance in man is
- A. astigmatism
- B. cretinism
- C. hyperthyroidism
- D. albinism
A gene which expresses itself only in the homozygous condition is
- A. a mutant
- B. dominant
- C. recessive
- D. lethal
Unlike auxins, gibberellins
- A. induces the formation of adventitious roots
- B. do not affect leaf and fruit abscission
- C. cannot stimulate stem elongation
- D. are quite effective as herbicides
The center for controlling body temperature in the brains is the
- A. cerebrum
- B. cerebellum
- C. medulla
- D. hypothalamus
The sequence of ear ossicles from the fenestra ovalis is
- A. malleus, incus and stapes
- B. malleus, stapes and incus
- C. stapes, incus and malleus
- D. stapes, malleuls and incus
The growth of a coleoptile towards unilateral light source is due to
- A. rapid rate of photosynthesis
- B. unequal distribution of auxin
- C. the effect of geotropism
- D. the effect of photolysis
A severe deficiency of thyroxin results in
- A. diabetes mellitus
- B. sexual underdevelopment
- C. cretinism
- D. gigantism
Most cells in higher animals retain their power of division EXCEPT
- A. lymphocytes
- B. nerve cells
- C. malpighian cells
- D. germ cells
Growth can best be determined in a population of Spirogyra by measuring the
- A. total length of the filament
- B. total widths of the filaments
- C. rate of photosynthesis in the population
- D. dry weights of the organism