Page 40 - Ranger SPM 2022 Biology

Biology SPM SPM Model Paper
32. Which statement is true about 35. Which food chain loses the most
fertilisation in flowering plant? amount of energy?
A Fertilisation occurs as soon as a A Maize → cattle → human
pollen grain is matured B Soy bean → human
B Fertilisation produces genetically C Grass → goat → human
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identical plants D Phytoplankton → crustacean larva
C Fertilisation in plants produce → small fish → tuna fish → human
diploid zygote and triploid nucleus
D Fertilisation occurs between a 36. A pupil made a 1 m × 1 m quadrat to
male gamete and two female study the density of Mimosa pudica in
gametes a school field. Based on 5 quadrats,
the results were obtained and recorded
33. Which are the most likely adaptive as shown in Table 1
features of a plant growing in habitat
with high concentration of salt? Quadrat 1 2 3 4 5
I Thorny leaves Number
II Have stomata which removes of
excess water Mimosa 2 3 4 6 5
III Have special structures which pudica
secrete salt
IV Dropping off of old leaves that Table 1
store salt What is the density of Mimosa pudica
A I and II C II and III in the school field?
B I and III D III and IV A 2 m –2 C 4 m –2

–2
34. Figure 15 shows part of a nitrogen B 3 m D 5 m –2
cycle. 37. An experiment was carried out to
Bacteria R determine the biochemical oxygen
demands (BOD) in different zones of
Atmospheric
Ammonia Nitrite Nitrate a river. Figure 16 shows a graph of the
nitrogen dissolved oxygen contents in zones A,
B, C, and D.
Process P Process Q
Figure 15 Concentration
of dissolved
What represent process P, process Q, oxygen
and bacteria R?

Proses P Proses Q Bakteria R
A Nitrogen Nitrification Nitrosomonas
fixation sp.
B Nitrification Nitrogen Nitrobacter sp. A B C D Zone
fixation
Figure 16
C Denitrification Nitrification Azotobacter sp.
Among zones A, B, C, and D, which
D Nitrification Denitrification Nitrobacter sp. has the highest BOD value?

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Model Paper.indd 386 3/29/22 5:22 PM