GIV
1. Drinking water is called potable water
2. Why pituitary gland is called growth of master gland
3. Why unicellular organisms are called one celled body
4. Sodium and potassium are stored in kerosene
5. Copper cannot displace zine from its salt solution
VI. Answer the following question in 2-3 sentences
1. Write a note on cytoplasm
2. Describe two methods of irrigation which conserve water
3. Explain the sex determination in the unborn baby?
4. What are the weeds? How can we control them?
STAVE
Answers
Answer:
1. If something is potable that means it's safe to drink. ... The word comes from the Latin potare, meaning "to drink." Not only did the Romans come up with that word; they built some of the world's first aqueducts, above-ground channels that brought potable water from the mountains to the cities.
2. The Pituitary gland, also known as the hypophysis, is a pea-sized endocrine gland situated at the base of our brain. It is often referred to as the 'Master Gland' because it produces some of the important hormones in the body.
3.As the name implies, unicellular organisms are made up of a single cell. ... Most of the unicellular organisms are also prokaryotes.
4.Sodium is a highly reactive metal and reacts vigorously with the oxygen, carbon dioxide and moisture present in the air such that it may even cause a fire. To prevent this explosive reaction, Sodium is kept immersed in kerosene because Sodium doesn't react with kerosene.
5.A higher reactive metal can displace less reactive metal from its aqueous salt solution. Hence, copper being less reactive than zinc, cannot replace it from a zinc sulphate solution.
vi.
1.Cytoplasm: It is a fluid that fills the cell and occurs between the plasma membrane and the nucleus. Cell organelles such as mitochondria, ribosomes, Golgi bodies, etc. are suspended in the cytoplasm. The cytoplasm helps in the exchange of materials between cell organelles.
2.Supply of water to crops at appropriate intervals is called irrigation. The time and frequency of irrigation varies according to different seasons, crops, and soil types.
Two methods of irrigation which help in conservation of water are:
†’ Sprinkler system: This system is more useful on uneven land, having fewer water supplies. In this method, water is supplied using pipes to one or more central locations within the field. When water is allowed to flow under high pressure with the help of a pump, it gets sprinkled on the crops.
†’ Drip system: In this system, water is delivered at or near the roots of plants, drop by drop. This is the most efficient method of irrigation as there is no wastage of water at all. This method is important in areas where water availability is poor.
3.All children will inherit an X chromosome from their mother, despite whether they are a boy or girl. Thus, the sex of the children will be determined by the type of chromosome inherited from their father. A child who inherits Y chromosome will be a boy and who inherits X chromosome will be a girl.
4.The undesirable plants that grow along with the crops are called weeds. These weeds, feed on the nutrients provided to the crops and thus reduce the supply of nutrients to the crops, thereby, hindering their growth. The growth of these weeds needs to be limited in order to enhance the growth of the plants.
Weeding methods
Some important weeding methods are listed below
Weeds can be controlled using weedicides: It is a chemical, which is sprayed in the fields to kill all available weeds. Weedicides are not harmful to crops.
Tilling before sowing of crops also helps in removing weeds: Tilling uproots the weeds. The best time for the removal of weeds is before they produce flowers and seeds.
The manual method of removing weeds is with the help of a khurpi. It involves regular uprooting or cutting of weeds close to the ground.
Manual method: Walking the field and pulling out the weeds.
By mechanical means: Using trowel through the field that will fill up the space between the crop rows and cut/kill the weeds.
Explanation:
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