#42.
Known as aphids of crucifers and may be a vector of virus diseases:
A
Plutella xylostella
B
Hellula undalis
C
Brevicoryne brassicae
D
Phyllotreta striolata
Answer: Brevicoryne brassicae
#43.
Which does not belong to the special-purpose classification of crops?
A
foliage crops
B
trap crops
C
silage crops
D
beverage
Answer: trap crops
#44.
The most effective wavelength for photoperiodism is:
A
gamma rays
B
far red and red
C
ultraviolet
D
red and blue
Answer: far red and red
#45.
component of Gossypium hirsutum ?
A
azadirachtin
B
hydrocyanic acid
C
tomatin
D
gossypol
Answer: gossypol
#46.
Special cells that allow rice plants to adjust to varying levels of O2 in the growth medium.
A
chloroplast
B
aerenchyma cells
C
bulliform cells
D
phytochrome
Answer: aerenchyma cells
#47.
Domestication of plants led to:
A
Narrower genetic variation and wider ecological adaptation.
B
change in plant type and limited ecological adaptation.
C
The disappearance of the natural or wild plants.
D
Increased genetic variation and limited ecological adaptation.
Answer: Narrower genetic variation and wider ecological adaptation.
#48.
Native or inherent soil nutrients are derived from:
A
applied fertilizers
B
decomposition of OM in the soil
C
weathering of minerals in the soil
D
physical disintegration of minerals
Answer: weathering of minerals in the soil
#49.
Grapes may be induced to flower by:
A
pruning
B
fertigation
C
smudging
D
irrigation
Answer: pruning
#50.
In IPM, the first order in controlling a certain insect pest.
A
killing the pest by chemical spray
B
biological control of pest
C
identifying the pest
D
planting varieties known to be resistant to problem pest
Answer: identifying the pest
#51.
An industrial crop yielding as high as 10 tons/ha annually without given much attention.
A
coconut
B
cacao
C
coffee
D
banana
Answer: coconut
#52.
They may develop on roots, stems or leaves and give rise to new shoots.
A
adventitious bud
B
axillary bud
C
leaf primordial
D
terminal bud
Answer: axillary bud
#53.
It is the exudation of liquid water from plants.
A
transpiration
B
evapotranspiration
C
diffusion
D
guttation
Answer: guttation
#54.
The term _____ is used in referring to those organic compounds, other than nutrients, present in minute quantities, that promote, inhibit, or modify growth and development.
A
inhibitors
B
growth regulators
C
auxins
D
cytokinins
Answer: growth regulators
#55.
Plants that flower irrespective of day length:
A
short-day plants
B
long-day plants
C
day-neutral plants
D
none of the above
Answer: day-neutral plants
#56.
Which is not a disease caused by virus?
A
crown or root rot of mango
B
tomato mosaic
C
tungro
D
bunchy top
Answer: crown or root rot of mango
#57.
Banana disease which is characterized by the presence of gray/dark spots with yellow halo
on the leaves that may lead to drying of leaves.
A
mosaic
B
cercospora leaf spot
C
blight
D
sigatoka leaf spot
Answer: sigatoka leaf spot
#58.
Weed presence in field crops may result in:
A
reduction in yield
B
causal organisms for some diseases
C
produce toxins or poison
D
alternate hosts for insect pests and diseases
Answer: alternate hosts for insect pests and diseases
#59.
Benefits that a member-country can receive through the GATT:
A
fair treatment in international trade for smaller countries
B
improved planning and implementation of investment and trade activities due to stable and transparent trading rules
C
greater opportunities for increasing exports and export earnings
D
all of the above
Answer: all of the above
#60.
The ground earwigs being mass-produced in the laboratory used to control corn borer: