1. What is meant by agricultural implements?
2. What is hybridisation? How is it done in plants?
3. What is pisciculture?
4. Why is it important to sow seeds at a correct distance from one another?
5- Give two precautions that must be taken while sowing seeds.
6. How does winnowing help in separation of grains from husk?
7. Why is the spraying of pesticides harmful to us?
Answers
Answer:
2) After selection of good varities, cross breeding is done by artificial pollination to get a variety of plant which has both the desired characteristics from the parent varieties. This is called hybridization.
Process
In artificial pollination during hybridization , the stamens of a bisexual flower are removed before their anthers mature
This flower, with gynoceium intact, is covered with a paper to prevent natural pollination
When the stigma of this flower matures pollen grains of another selected plant are taken and deposited on the stigma
The seeds produced after artificial pollination give rise to a new hybrid variety. which is generally better than the parent plant
They are high-yielding of better quality and are disease - resistant
Answer:
1. Agricultural implements are the machinery which are used on a farm to help with farming or to improve farming
2. Hybridization, Plant. Hybridization is the process of interbreeding between individuals of different species (interspecific hybridization) or genetically divergent individuals from the same species (intraspecific hybridization). Offspring produced by hybridization may be fertile, partially fertile, or sterile.
3. The breeding, rearing, and transplantation of fish by artificial means is called pisciculture, in other words, fish farming. It is the principal form of aquaculture, while other methods may fall under mariculture. It involves raising fish commercially in tanks or enclosures, usually for food.
4. It is very important to sow seeds at the correct distance from each other because plants need some space to grow up and to stretch their branches and they will get sufficient amount of sunlight and nutrients and their will be no competition for food and nutrients.
5. The following precautions should be taken while sowing seeds: (i) Seeds should be grown at proper depth. (ii) They should be sown at a proper distance apart from each other. (iii) Seed used for sowing should be clean, healthy and free from any disease or infection
6. Winnowing is the method in which heavier components of the mixture are separated from the lighter substances with the help of wind. This method is used for separating grains from husk after the process of threshing. ... The husk being lighter is carried away by the wind and forms a different heap.
7.Pesticides are stored in your colon, where they slowly but surely poison the body. ... After countless studies, pesticides have been linked to cancer, Alzheimer's Disease, ADHD, and even birth defects. Pesticides also have the potential to harm the nervous system, the reproductive system, and the endocrine system.