the circle. . Continue to stare and slowly bring the figure nearer to your eye. .
Note the point at which the circle will seem to disappear. This is your blind spot. . Record the distance.
. Test your other eye in a similar manner, but focus on the circle and watch for the cross to disappear. Result: ) Blind spot of my right eye is ) Blind spot of my left eye . Identify the sex of the cockroach by observing the given specimen/picture /model and write two reasons.
Identification : Reasons: . KANGAYAM BULL Identification: The photograph kept for identification is Kangayam bull. Economic importance: . It is originated from the place called Kangayam in Tamilnadu.
. This breed is meant for pulling carts, ploughing fields etc. . This breed is exclusively used in the traditional game called Jallikattu (manju virattu) in Tamilnadu.
. It is a best example for a draught breed. VI. Identify the photograph / picture ‘G’ and write its economic importance XI Std Biology-Zoology Glossary Clean water Gravel Waste water Pump Waste uptake by plants and bacteria .
AQUAPONICS Identification: The photograph kept for identification is Aquaponics. Economic importance: . Aquaponics is a technique which is a combination of Aquaculture and Hydroponics. .
It maintains balanced ecosystem by recycling the waste and excretory products produced by the fish. . Cultivable fishes like Tilapia, Gold fish, Koduva etc. are cultured in aquaponics.
. Plants like tomato, pepper and cucumber can be cultivated in this method. . HONEY BEE Identification: The photograph kept for identification is Honey bee.
Economic importance: . The chief products of bee keeping industry are honey and bee wax. . Honey is the healthier substitute for sugar.
. It is used as an antiseptic, laxative and as a sedative. . Bee wax secreted by the abdomen of the worker bee is used for making candles, polishes for floors and furniture etc.
. Bombyx mori Identification: The photograph kept for identification is silkworm Bombyx mori Economic importance: . Silk fibre produced by this silkworm is