Economic Biology

Samacheer Book Back Questions And Answers For Science Standard 9 “Economic Biology“

I. Choose the correct answer:
1. The production and management of fish is called
(a) Pisciculture
(b) Sericulture
(c) Aquaculture
(d) Monoculture

2. Which one of the following is not an exotic breed of cow?
(a) Jersey
(b) Holstein-Friesan
(c) Sahiwal
(d) Brown Swiss

3. Which one of the following is an Italian species of honey bee?
(a) Apis mellifera
(b) Apis dorsata
(c) Apis florae
(d) Apis cerana

4. Which one of the following is not an Indian major carp?
(a) Rohu
(b) Catla
(c) Mrigal
(d) Singhara

5. Drones in the honey bee colony are formed from
(a) unfertilized egg
(b) fertilized egg
(c) parthenogenesis
(d) both b and c

6. Which of the following is an high milk yielding variety of cow?
(a) Holstein-Friesan
(b) Dorset
(c) Sahiwal
(d) Red Sindhi

7. Which Indian variety of honey bee is commonly used for apiculture?
(a) Apis dorsata
(b) Apis florea
(c) Apis mellifera
(d) Apis indica

8. _____ is the method of growing plants without soil.
(a) Horticulture
(b) Hydroponics
(c) Pomology
(d) None of these

9. The symbiotic association of fungi and vascular plants is
(a) Lichen
(b) Rhizobium
(c) Mycorrhizae
(d) Azotobacter

10. The plant body of mushroom is
(a) Spawn
(b) Mycelium
(c) Leaf
(d) All of these

II. Fill in the blanks:
1. Quinine drug is obtained from _____.
2. Carica papaya leaf can cure _____ disease.
3. Vermicompost is a type of soil made by _____ and microorganisms.
4. _____ refers to the culture of prawns, pearl and edible oysters.
5. The largest member in a honey bee hive is the _____.
6. _____ is a preservative in honey.
7. _____ is the method of culturing different variety of fish in a water body.

Answers:
1. Cinchona
2. Dengue
3. Earthworm
4. Aquaculture
5. Queen Bee
6. Formic acid
7. Polyculture

III. Say true or false. If false, correct the statement:
1. Mycorrhiza is an algae.
2. Milch animals are used in agriculture and transport.
3. Apis florea is a rock bee.
4. Ongole is an exotic breed of cattle.
5. Sheep manure contains high nutrients than farm yard manure.

Answers:
1. False (Mycorrhiza is a fungi)
2. False (Milch animals are used in milk production)
3. False (Apis dorsata is a rock bee)
4. False (Ongole is an Indian breed of cattle)
5. True

V. Match the following:
1. Lobsters               A. Marine fish
2. Catla                     B. Pearl
3. Sea bass               C. Shell fish
4. Oysters                 D. Paddy
5. Pokkali                  E. Fin fish
6. Pleurotus sps        F. Psoriosis
7. Sarpagandha        G. Oyster mushroom
8. Olericulture          H. Reserpine
9. Wrighta tinctoria  I. Vegetable farming

Answers:
1. C
2. E
3. A
4. B
5. D
6. G
7. H
8. I
9. F

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