9th Standard Syllabus & Materials
9th Standard
TN 9th Tamil உள்ளத்தின் சீர் -கற்கண்டு (இலக்கணம்) - தொடர் இலக்கணம், ஆகுபெயர் Important Questions And Answers Study Material - QB365 Set A
NEW9th Standard
TN 9th Tamil உள்ளத்தின் சீர் -விரிவானம் (துணைப்பாடம்) - தாய்மைக்கு வறட்சி இல்லை! Important Questions And Answers Study Material - QB365 Set A
NEW9th Standard
TN 9th Tamil உள்ளத்தின் சீர் -கவிதை பேழை (செய்யுள்) - மார்கழி பெருவிழா Important Questions And Answers Study Material - QB365 Set A
NEW9th Standard
TN 9th Tamil உயிருக்கு வேர்-இலக்கணம் - பகுபத உறுப்பிலக்கணம் Important Questions And Answers Study Material - QB365 Set A
NEW9th Standard
TN 9th Tamil அமுதென்று பேர் - இலக்கணம்-எழுத்து -அளபெடை Important Questions And Answers Study Material - QB365 Set A
NEW9th Standard
TN 9th Tamil அமுதென்று பேர்-துணைப்பாடம் - ஆறாம்திணை Important Questions And Answers Study Material - QB365 Set A

Published on: 31/10/2019
Economic Biology
Download Tamil Nadu 9th Standard Science question papers, model tests, one-mark questions, important questions, and public exam papers in PDF format. Free study materials and answer keys for TN State Board students.
Questions + Answers key
Take MCQ Science Test1.
It is a live floating nitrogen factory.
Azolla
Azospirillum
Azotobacter
Rhizobium
2.
The plant body of mushroom is
Spawn
Mycelium
Leaf
All of these
3.
Drones in the honey bee colony are formed from
unfertilized egg
fertilized egg
parthenogenesis
both b and c
4.
Which one of the following is not an Indian major carp?
Rohu
Catla
Mrigal
Singhara
5.
The production and management of fish is called
Pisciculture
Sericulture
Aquaculture
Monoculture
6.
Pasturage is related to _______________.
7.
___________ is a preservative in honey.
8.
__________ refers to the culture of prawns, pearl and edible oysters.
9.
__________ is the maintenance of bee colonies in modern hives.
10.
Carica papaya leaf can cure __________ disease.
11.
Sheep manure contains high nutrients than farm yard manure.
12.
Ongole is an exotic breed of cattle.
13.
Milch animals are used in agriculture and transport.
14.
Mycorrhiza is an algae.
15.
Medicinal plants contain compounds that can be used for therapeutic purposes.
16.
List the medicinal importance of honey.
17.
What are the species of earthworm used for vermiculture?
18.
Mention any two mushroom preservation methods.
19.
What are the types of vegetable garden?
20.
What are secondary metabolites?
21.
List out the uses of honey.
22.
What are the sources of organic resources for vermicomposting?
23.
What are biofertilisers? Give examples. Why are biofertilisers better than other fertilizers.
24.
Give an account on medicinal plants.
1.
(a)
Azolla
2.
(b)
Mycelium
3.
(a)
unfertilized egg
4.
(d)
Singhara
5.
(a)
Pisciculture
6.
( )
apiculture
7.
( )
Formic acid
8.
( )
Aquaculture
9.
( )
Apiculture or Bee keeping
10.
( )
Dengue
11.
(a)
12.
(b)
13.
(b)
14.
(b)
15.
(a)
16.
1. Honey has an antiseptic and antibacterial property. It is a blood purifier.
2. It helps in building up of Haemoglobin content in the blood.
3. It is used in Ayurvedic and Unani system of medicines.
4. It prevents cough, cold, fever and relieves sore throat .
5. It is a remedy for ulcers of tongue, stomach and intestine.
6. It enhances digestion and appetite.
17.
Perionyx excavatus (Indian blue worm), Eisenia fetida (Red worms), Eudrilus eugeniae (African night crawler) are the species of earthworm used for vermiculture.
18.
i) Freezing
ii) Drying
iii) Canning
iv) Vacuum cooling
v) Gamma radiation and storing at 15oC
19.
i) Kitchen or Nutrition gardening.
ii) Commercial gardening.
iii} Vegetable forcing.
20.
All the major system of medicines such as Ayurveda, Yoga, Unani, Siddha, Homeopathy use drugs obtained from plants and animals. These drugs from medicinal plants are called secondary metabolites.
21.
1. Honey has an antiseptic and antibacterial property. It is a blood purifier .
2. It helps in building up of haemoglobin content in the blood .
3. It is used in ayurvedic and unani system of medicines .
4. It prevents cough, cold, fever and relieves sore throat .
5. It is remedy for ulcers on tongue, stomach and intestine .
6. In enhances digestion and apetite.
22.
Biologically degradable organic wastes are used as potential organic resources for vermicomposting.
1. Agricultural waste such as crop residue, vegetable waste, sugarcane trash.
2. Crop residues such as rice straw, tea wastes, cereal and pulse residues rice husk, tobacco wastes, coir wastes.
3. Leaf litter
4. Fruit and vegetable wastes.
5. Animal wastes - cattle dung, poultry droppings, pig slurry, goat and sheep dropping.
6. Biogas slurry.
23.
Biofertilizers are substances that contain living micro organisms which, when applied to
seeds, plant surfaces or soil, colonize the rhizosphere or the lnterior of the plant and promote growth by increasing the supply or availability or primary nutrients to the host plant.
Example:
Rhyzobium:
It is a soil bacterium that colonize the roots of leguminous plants to form root nodules. The bacteria fix atmospheric nitrogen and convert them to ammonia.
Advantages of biofertilizers aver other Fertilizers:
1. In addition to releasing nutrients biofertilizers improve the structure and texture of the soil and increases the ability to hold water and nutrients, overtime, the soil and plants become healthy and strong.
2. Since it is technically living, it can symbiotically associate with plant roots involved micro organisms could readily and safely convert complex organic material into simple compounds, so that they are easily taken up plants.
3. Micro organism function is in long duration causing improvement of the soil fertility. It maintains the natural habitat of the soil.
4. It increase crop yield by 20 - 30% replaces chemical nitrogen and phosphorous by 30% and stimulates plant growth.
5. It can also provide protection against drought and soil borne diseases.
24.
1. Most of the medicines are obtained either directly or indirectly from plants .
2. All the major systems of medicines such as Ayurveda, Yoga, Unani, Siddha, Homeopathy use drugs obtained from plants and animals .
3. The drugs obtained from plants are called secondary metabolites .
4. Plants produce secondary metabolites for protection, competition and species interaction, (eg) Alkaloids, terpenoids, flavonoids etc.,
5. Phytochemistry is the study of phytochemicals, which are chemical substances derived from the various parts of the plant.
Example:
1. The drug Anthraquinones is derived from the leaves of katralai plant.
2. Quinine. is obtained from the barks of cinjoria maram .
3. Terpenoids is obtained from all parts of Nilavembu.
9th Standard Syllabus & Materials
9th Standard
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TN 9th Tamil உயிருக்கு வேர் - தண்ணீர் Important Questions And Answers Study Material - QB365 Set A
Tamilnadu Stateboard 9th Standard Subjects
Tamilnadu Stateboard Standards