Question 1 of 20 2,572 total questions
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
The plantain reproduces asexually by
A suckers
B buds
C fragments
D spores
A samara differs from a cypsela by having
A an extended pericarp
B a hard pericarp
C a pericarp fused with seed coat
D some hairy outgrowth on the pericarp
A flower showing radial symmetry is said to be
A pentamerous
B protandrous
C protogynous
D actinomorphic
The pineapple fruit is best described as
A aggregate, succulent and indehiscent
B aggregate, succulent and dehiscent
C multiple, succulent and indehiscent
D multiple, succulent and dehiscent
Sclerenchyma cells are lignified to
A strengthen and support the plant
B transport synthesized food
C conduct water and salt
D protect the plant from injury
Next
Question Navigator
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
