Question 1

Question 3Fill in the blanks:Cattle feed made from cereals and wheat is called ...............Rearing of birds for eggs and meat is called ...............Animal food is rich in .............................. is an example of root crop.Cereals are rich in .............................. are chemical substances used to destroy pests................ ia an example of a tuber crop.Pig farming is termed as ...............

Accepted Answer

Cattle feed made from cereals and wheat is called concentrates.Rearing of birds for eggs and meat is called poultry.Animal food is rich in proteins.Sweet potato is an example of root crop.Cereals are rich in carbohydrates.Pesticides are chemical substances used to destroy pests.Potato ia an example of a tuber crop.Pig farming is termed as piggery.

Question 2

Question 1(b)Distinguish between Food crops and Cash crops.

Accepted Answer

Difference between Food crops and Cash crops:Food cropCash cropFood crops are cultivated for the production of food.Cash crops are cultivated for commercial purposes.Examples — Wheat, PulsesExamples — Cotton, Rubber

Question 3

Question 1(c)Distinguish between Green revolution and White revolution.

Accepted Answer

Difference between Green revolution and White revolution:Green revolutionWhite revolutionThe Green Revolution involved the development and application of high-yielding crop varieties, enhanced irrigation, and the use of chemical fertilisers and pesticides to increase agricultural productivity.The White Revolution focused primarily on milk production, aiming to increase dairy yield and improve rural livelihoods through cooperative milk unions and dairy farming advancements.Father of Green Revolution was M.S. Swaminathan.Father of White revolution was Verghese Kurien.

Question 4

Question 1(d)Distinguish between Milch animals and Draught animals.

Accepted Answer

Difference between Milch animals and Draught animals:Milch animalsDraught animalsMilch animals are those who are kept for the purpose of milk production.Draught animals are those whose males are used for ploughing and carriage purpose.Example: Cow, BuffaloExample: Ox, Camel, Horse

Question 5

Question 1(e)Distinguish between Kharif crops and Rabi crops.

Accepted Answer

Difference between Kharif crops and Rabi crops:Kharif cropsRabi cropsKharif crops are sown in early May – usually at the beginning of the first monsoon rains.Rabi crops are sown around mid-November, preferably after the monsoon rains.They are known as autumn crops.They are winter crops.Example: RiceExample: Wheat

Question 6

Question 2Briefly explain the following terms :(a) Animal Husbandry(b) Sericulture(c) Aquaculture(d) Hatcheries(e) Pisciculture

Accepted Answer

(a) Animal Husbandry — The branch of biology which deals with feeding, shelter, caring and breeding of domesticated animals is called animal husbandry.(b) Sericulture — The technique of artificial rearing of silkworm for production of silk is called sericulture.(c) Aquaculture — Aquaculture is the term used for production or farming of useful aquatic animals like fish, prawns, lobsters, molluscs, etc.(d) Hatcheries — A hatchery is a facility where eggs are hatched under artificial conditions, especially those of fish or poultry.(e) Pisciculture — Pisciculture is the production and management of fishes. It involves breeding and raising fish commercially in tanks or enclosures mainly for food.

Question 7

Question 4Mention the benefits of "Green Revolution" and "White Revolution" in our country.

Accepted Answer

Following are the benefits of "Green Revolution" in our country:Green Revolution enabled the agriculture industry to produce much larger quantities of food grains making it possible to feed the growing population of the country.It made the country self sufficient in Wheat production.It improved the economic condition of the farmers.It enabled the agriculture industry to give employment to a large section of India's population.Following are the benefits of "White Revolution" in our country:White Revolution resulted in India becoming the largest producer of milk and milk products in the world.It strengthened the dairy farmer’s income.It ensured easy availability of milk at a fair price to all.

Question 8

Question 5Draw a neat and labeled diagram of the life cycle of a silk moth and answer the following questions.(a) What are the four stages in the life cycle of a silk moth?(b) Write the specific names for the larva and pupa of the silk moth.(c) Name the process of recovering threads from the killed cocoons.(d) Name a suitable plant on which these insects grow and develop successfully.(e) Which kind of fibres can be made by using the threads from the cocoons ?

Accepted Answer

Labeled diagram showing the life cycle of a silk moth is given below:(a) The four stages in the life cycle of a silk moth are:EggLarvaPupaAdult(b) The specific names for the larva and pupa of the silk moth are Caterpillar and Chrysalis.(c) Reeling.(d) Mulberry(e) Silk fibre can be made by using the threads from the cocoons.

Question 9

Question 6Draw a neat and labeled diagram of the 'Internal structure of yeast'. Answer the following questions.(a) Name the kingdom to which the yeast belongs.(b) Is it unicellular or multicellular?(c) Write the specific mode of nutrition in this organism.(d) What are the suitable medium/places where yeast can grow successfully?(e) Name two vitamins which are found in yeast.(f) Write the economic importance of yeasts in two points.

Accepted Answer

Labeled diagram showing the ‘Internal structure of yeast’ is given below:(a) Fungi(b) Unicellular(c) Yeast has a heterotrophic mode of nutrition.(d) Yeast can grow successfully in moist and warm conditions in presence of sugar.(e) Yeast is a source of vitamin B and vitamin E.(f) Two points highlighting the economic importance of yeasts are:Yeast is used in breweries to produce alcohol by the fermentation of sugar.Yeast is used in bakeries to prepare bread.

Question 10

Question 7Draw a neat and labelled diagram of a bacterium showing its internal structure. Answer the following questions.(a) Name the kingdom to which bacteria belongs.(b) Are they prokaryotes / eukaryotes?(c) What are the four kinds of bacteria on the basis of their shape? Write the specific terms with their shapes.(d) Name the outermost protective covering of a bacterium.(e) What are the four suitable conditions required for the growth and development of bacteria?(f) Name two kinds of respiration which can take place in bacteria.(g) Mention the locomotory structure of bacteria which can help them to move.

Accepted Answer

Labeled diagram showing the internal structure of a bacterium is given below:(a) Monera.(b) They are prokaryotes.(c) Bacteria can be classified into four types based on their shape:Coccus (round shape)Bacillus (rod shape)Spirillum (spiral shape)Vibrio (comma shape)(d) Slime Capsule.(e) Four suitable conditions required for the growth and development of bacteria are:Availability of adequate water.Appropriate food supply.Suitable temperature.Sufficient air.(f) Two kinds of respiration which can take place in bacteria are:Aerobic respirationAnaerobic respiration(g) The locomotory structure of bacteria that helps them move is called the flagellum.

Question 11

Question 1(g)Amit and Sumit studied different kinds of microbes like viruses, bacteria, algae, fungi and protozoa. Which of the following statements does not match with the characteristic features of fungi ?Fungi may be unicellular or multicellular.They do not have chlorophyll and cannot prepare their own food.Fungi help in biological nitrogen fixation and improve the soil fertility.They are saprophytic in nature.

Accepted Answer

Fungi help in biological nitrogen fixation and improve the soil fertility.Reason — Fungi are saprophytic in nature, i.e. they feed on dead and decaying organic matter and are called the natural cleaners of environment. They do improve soil health through decomposition but not by fixing nitrogen directly.

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