II.
Short Answer Questions.
1. Define the following:
a. Ploughing
b. Harvesting
c. Threshing
d. Irrigation
2. What are the two methods of moder
irrigation? Explain.
3.
What do you understand by the terr
'hybridisation'?
Long Answer Questions.
Answers
Answer:
1. a. turn up the earth of (an area of land) with a plough, especially before sowing.
b. gather (a crop) as a harvest.
c. separate grain from (corn or other crops), typically with a flail or by the action of a revolving mechanism
d. the supply of water to land or crops to help growth, typically by means of channels.
2. Drip irrigation - Drip irrigation is the most used irrigation system these days. In the drip irrigation, we lay plastic pipes in rows near the crops or plants. These pipes have holes in them. The water seeps from these holes drop by drop, hence the name drip irrigation. Drip irrigation is one of the most efficient irrigation methods as it reduces water wastage in agriculture.
Sprinkler system - Sprinkler systems mimic the phenomenon of rain. In sprinkler systems, the pipes carry water to central locations on the farm. The sprinklers placed there, distribute the water across the fields. The sprinkler method is one of the most efficient irrigation methods to irrigate the uneven land for agriculture. In addition, sprinkler systems provide the best coverage regardless of the size of the farm.
3. Hybridisation (or hybridization) is a process of mathematically combining two or more atomic orbitals from the same atom to form an entirely new orbital different from its components and hence being called as a hybrid orbital.