6) choose the correct answer:
a) Yeast is used in the production of
i) Sugar ii) Alcohol iii) Oxygen iv) hydrochloric acid
b) Carriers of malaria causing protozoa is -
i) Cockroach ii) Female anopheles mosquito iii) Housefly iv) Butterfly
c) The process of loosening of soil is called
i) tilling ii) harvesting iii) weeding iv) spraying
d) Force changes the
i) motion of the body ii) speed of the body iii) shape of the body iv) All of these
7) What is crop? Name the two types of crops.
8) What are fertilizers? Mention any four differences between manure and fertilizers.
9) Fill in the blanks:
a) Cholera is caused by
b) Like synthetic fibre, plastic is also a of
c) A charged body _ an uncharged body towards it.
10) Why should we not wear synthetic clothes in the kitchen or in a laboratory?
11) How can we avoid the harmful effects of plastic? How is rayon obtained?
12)a) What are micro-organisms? Name the groups of micro-organisms.
b) Name any two discases that can be prevented by vaccination.
13)a) Mention two advantages and two disadvantages of friction.
b) On what factors does fluid friction depends?
please give the answer fast:(
Answers
Answer:
(a) Alcohol
(b) Female Anopheles mosquito
(c) Tilling
(d) All of these
(7) A crop is the cultivation of the same kind of plant on a large scale in a field to obtain the produce.
1. Rabi crops.
2. Kharif crops.
(8) Fertilizers are chemical compounds of mineral nutrients for plants prepared in fertilizer factories. Sorry but i don't know the 4 differences b / w them.
(9) air disease.
(10) Because synthetic clothes catches fire quickly. They are the conductors of fire.
(11) Sorry but i don't know the answer of this Q. Sorry.
(12) Plz wait for these answers.
(13) Plz wait for these answers.
Plz plz mark me as brainliest, drop some thnks and follw me plz
Answer:
A) Alcohol
B) Female anopheles mosquito
C) Tilling
D) All of these
1)What is crop? Name the two types of crops.
Ans:Crop is the term used to describe a plant that is grown in a field on a large scale. Kharif and Rabi crops.
2)What are fertilizers? Mention any four differences between manure and fertilizers.
Ans:a chemical or natural substance added to soil or land to increase its fertility.
Manure:
a)Manure is an organic substance that is obtained from decomposition of vegetables and animal waste.
b)Manures are relatively less rich in plant nutrients, they only remove general deficiency of soil.
c)They add humus to soil by providing organic substances and nutrients.
d)The addition of manure to soil does not require any special guideline.
Fertilizer:
a)Fertilizers are inorganic substances manufactured in factories.
b)Fertilizers are very rich in plant nutrients like Nitrogen N, Phosphorus P, Potassium K.
c)They ensure healthy growth and development of plants by providing nutrients however lack to add humus to soil.
d)The addition of fertilizer to soil requires special guidelines like dose time and post addition precautions should be followed to avoid mineral toxicity.
Fill in the blanks
a)Vibrio cholerae
b)polymer
c) induces opposite charge
1)How can we avoid the harmful effects of plastic? How is rayon obtained?
Ans:Use non-plastic straws. Shop in bulk: This is one of the best ways to reduce packaging waste. This will reduce plastic waste from your house too. Store your food in glass or steel containers: Opt for reusable containers rather than plastic zipper bags.
Rayon is described as a regenerated fibre because the cellulose, obtained from soft woods or from the short fibres (linters) that adhere to cottonseeds, is converted to a liquid compound, squeezed through tiny holes in a device called a spinnerette, and then converted back to cellulose in the form of fibre.
2) a)What are micro-organisms?Name the groups of micro-organisms
Ans:A microorganism, or microbe, is a microscopic organism, which may exist in its single-celled form or a colony of cells.
five major types: Viruses, Bacteria, Archaea, Fungi, and Protists.
b)Name any two discases that can be prevented by vaccination.
Ans: 1)pertussis (whooping cough)
2)poliomyelitis (polio)
3)A)Mention two advantages and two disadvantages of friction.
Ans: Advantages of friction:
1)Friction enables us to walk freely.
2)It helps to support ladder against wall.
disadvantages of friction:
1)It always resists the motion, so extra energy is required to overcome it.
2)It causes wear and tear of machines.
B)The frictional force on an object in a fluid depends on its speed with respect to the fluid. The frictional force also depends on the shape of the object and the nature of the fluid.
Explanation:
Hope its Helpful :)