11) Our major foods, fibres, spices, fruits and beverage crops are
a) flowering plants
b) gymnosperms plants
c) pteridophytes
d) bryophytes
12) Nitrogen is fixed in ecosystems in ways stated below. Which one of the statements below is false?
a) By cyanobacteria
b) By electrical discharges in the atmosphere
c) By industrially synthesised fertilizer
d) By denitrification
13) DNA structure was first described by
a)Catcheside
b) Nirenberg
c) Lederberg
d) Watson and Crick
14) Nymph is the name of young one of
a) butterfly
b) beetle
c) housefly
d) cockroach
15) On which of the following plants did Gregor Mendal perform his classical experiment?
a) Gram
b) Maize
c) Pea
d) Wheat
16) Night blindness is cause by lack of which vitamin?
a) Vitamin A
b) Vitamin B
c) Vitamin C
d) Vitamin D
18) Mycobacterium leprae causes leprosy, Corynebacterium diphtheria causes diphtheria and Vibrio comma causes
a) tetanus
b) influenza
c) cholera
d) typhoid
19) Radical vascular bundles are those in which
a) xylem is surrounded by phloem
b) phloem is surrounded by xylem
c) xylem and phloem occur on the same radius
d) xylem and phloem occur on the different radii
20) Which is not an example of fungi ?
a)Mushroom
b)Mucor
c)Albugo
d)Pulp