Student's Copy
2 0 1 8
CBCS
5th Semester
ZOOLOGY
EIGHTH PAPER
Entomology
Full Marks 75
Time 3 hours
PART A—OBJECTIVE
Marks 25
The figures in the margin indicate full marks for the questions
SECTION—A
Marks 10
Tick the correct answer in the brackets provided 1×10=10
1. Insects lacking the ability to fold their wings over the abdomen belong to
the sub-class
Apterygota
Palaeoptera
Paraneoptera
Polyneoptera
2. The scientific name of the rice leaf folder is
Nilaparvata lugens
Dicladispa armigera
Cnaphalocrocis medinalis
Chilo suppressalis
3. An elastomeric protein in the body wall of insects responsible for flexibility
is
chitin
arthropodin
sclerotin
resilin
/141 1 Contd.
4. A food storage organ in insects is
esophagus
pharynx
crop
mid gut
5. A fat-soluble hormone secreted by corpora allata of insects is
juvenile hormone
ecdysone
prothoracicotropic hormone
bursicon
6. An example of ametabolous insect is
honeybee
silverfish
grasshopper
mosquito
7. The two crops of Kusumi strain of lac are
jethwi and aghani
kartiki and baisakhi
jethwi and kartiki
aghani and baisakhi
8. A silkworm which is considered as the largest moth in the world is
Bombyx mori
Antheraea polyphemus
Actias luna
Attacus atlas
9. The increasing concentration of a substance, such as pesticides like DDT,
in successively higher trophic level is termed as
big bang
explosion
biomagnification
outbreak
ZOO/V/CC/15(b)/141 2 Contd.
10. A biological control agent which is an egg parasitoid is
Chrysoperla carnea
Trichogramma spp.
Epilachna spp.
Apanteles spp.
SECTION—B
Marks 15
Write short notes on the following in 5-8 sentences each 3×5=15
1. General characters of Hymenoptera
OR
Orders of Insecta
2. Female reproductive organs of insects
OR
Composite of body wall of insects
3. Trophallaxis
OR
Hormones of insect metamorphosis
4. Outline of silkworm life cycle
OR
Role of worker bees
5. Parasitic insects
OR
Biological pesticides
PART B—DESCRIPTIVE
Marks 50
The figures in the margin indicate full marks for the questions
1. Discuss the different methods for insect's collection. Add a note on their
preservations. 7+3=10
OR
What is pest? Discuss the major insect pests of vegetables. 2+8=10
ZOO/V/CC/15(b)/141 3 Contd.
2. Discuss the respiratory system in insects with a suitable diagram. 8+2=10
OR
Discuss the structure and functions of insect mouthparts with a suitable
diagram. 8+2=10
3. Elucidate the caste system in insects with reference to honeybee. 10
OR
Describe the different types of metamorphosis in insects giving examples. 10
4. Discuss briefly the mechanism of action of insect's hormones. 10
OR
Discuss the cultivation of lac insect. Add a note on its economic importance.
7+3=10
5. Give a brief account of predatory insects and their utility as biological
control agents. 10
OR
Discuss the chemical control of insect pest. Add a note on an integrated
pest management. 6+4=10