West Bengal Class 8 English Medium Science Solution Chapter 8 Human Food and Food Products
On this Page we have given West Bengal Class 8 English Medium Science Solution Chapter 8 Human Food and Food Products Question and Answer for our Students of West bengal Class 8 English Medium. Hope this following Question Answer will help our Students.
We have given several inside based questions by our teachers. This Questions and answer is under West Bengal Class 8 Solution section. West Bengal State Board English medium students will benefit by this exclusive solution.
Q.(1) MCQ
1.) The branch of science that is concerned with discovering new and improved varieties of crops and their production
A) Botany
b) Agriculture
c) Horticulture
d) Animal husbandry
Answer: Agriculture
2.) The terms for plants that are collectively cultivated in a large area and special attention is given to their needs to increase productivity
A) Herbs
b) Vegetables
c) Fruits
d) Crops
Answer: Crops
3.) Which type of crop includes crops like cotton and jute?
a) Fibre crops
b) Medicinal crops
c) Tuber crops
d) Sugar crops
Answer: Fibre crops
4.) The branch of agriculture that is concerned with the cultivation of fruits and vegetables is
A) Animal husbandry
b) Horticulture
c) Crop production
d) Soil management
Answer: Horticulture
5.) _____ crop is generally harvested at the end of the monsoon season
A) Kharif crops
b) Rabi crops
c) Cereal crops
d) Medicinal crops
Answer: Kharif crops
6.) Only one of the following is not an agricultural practice
a) Sowing of seeds
b) Adding manure and fertilizers
c) Market analysis
d) Protection from pests
Answer: Market analysis
7.) The purpose of preparing the soil before planting a crop is
A) To remove weeds from the soil
b) To improve soil aeration
c) To increase organic content in the soil
d) To enhance soil fertility
Answer: to improve soil aeration
8.) These organisms help in loosening the soil and increasing its organic content
A) Earthworms and microorganisms
b) Weeds and pests
c) Fungi and bacteria
d) Insects and rodents
Answer: Earthworms and microorganisms
9.) It’s the tool that is commonly used for ploughing the field and mixing fertilizers with the soil
a) Hoe
b) Cultivator
c) Harrow
d) Plough
Answer: Plough
10.) levelling tools are used in agriculture for the purpose of
a) To mix organic fertilizers with the soil
b) To minimize soil erosion
c) To sow seeds evenly
d) To control weed growth
Answer: To minimize soil erosion
11.) Farmers can differentiate between good, healthy seeds and spoiled seeds
A) By their color
b) By their size
c) By their weight in water
d) By their smell
Answer: By their weight in water
14.) What is the purpose of using a seed drill in agriculture
a) To sow seeds at the right distances and depths
b) To remove weeds from the field
c) To harvest crops efficiently
d) To irrigate the crops
Answer: To sow seeds at the right distances and depths
15.) Farmers sometimes dip seeds in chemicals before sowing so
a) To increase seed size
b) To enhance seed color
c) To reduce the chances of seed infection
d) To improve seed germination rate
Answer: To reduce the chances of seed infection
16.) Identify the macronutrients that arerequired for plant growth
A) Iron, Manganese, Copper
b) Carbon, Hydrogen, Oxygen
c) Nitrogen, Phosphorus, Potassium
d) Calcium, Magnesium, Sulfur
Answer: Nitrogen, Phosphorus, Potassium
17.) Organic manure is produced
a) Through chemical reactions in laboratories
b) By decomposing dead plants and animal wastes
c) By extracting minerals from rocks
d) By mixing inorganic salts with water
Answer: By decomposing dead plants and animal wastes
18.) The three major components of NPK fertilizers are
a) Nitrogen, Phosphorus, Iron
b) Nitrogen, Potassium, Calcium
c) Nitrogen, Phosphorus, Potassium
d) Nitrogen, Potash, Sulfur
Answer: Nitrogen, Phosphorus, Potassium
19.) The excessive use of inorganic fertilizers can cause problems such as
A) Reduction in soil fertility and harm to beneficial bacteria
b) Increased acidity of the soil and pollution of water sources
c) Imbalance between acidity and alkalinity of the soil
d) All of the above
Answer:All of the above
20.) How does organic manure improve soil texture
a) By increasing the water retention capacity of the soil
b) By making the soil porous and well-aerated
c) By increasing the number of beneficial microbes in the soil
d) Both b) and c)
Answer: Both b) and c)
21.) Crop rotation in agriculture is done
a) To maintain the balance of acidity and alkalinity in the soil
b) To replenish nitrogenous compounds in the soil through leguminous plants
c) To Improve soil texture and water retention capacity
d) To prevent the growth of harmful microbes in the soil
Answer: To replenish nitrogenous compounds in the soil through leguminous plants
22.) Irrigation is necessary in agriculture
a) To supply water for the growth and development of plants
b) To ensure the germination of seeds
c) To transport nutrients to different plant organs
d) All of the above
Answer: All of the above
23.) The disadvantage of traditional methods of irrigation are
A) They are expensive and require advanced machinery
b) They are ineffective and lead to water misuse
c) They do not provide sufficient water to the crops
d) They require excessive human or animal labor
Answer: they are ineffective and lead to water misuse
24.) How are weeds controlled in agricultural fields
A) By uprooting them before sowing the seeds
b) By cutting them very close to the ground
c) By using chemical substances called weedicides
d) All of the above
Answer: All of the above
25.) The pests in agriculture are those
a) Unnecessary plants that grow along with the cultivated crops
b) Harmful chemicals used to control weed plants
c) Animals or insects that feed on or damage the crops
d) Diseases caused by bacteria, fungi, and viruses
Answer: Animals or insects that feed on or damage the crops
26.) One of the following diseases is caused by fungi in crops
A) Rust disease in wheat
b) Wilt disease in potato
c) Blight disease in potato
d) All of the above
Answer: Rust disease in wheat
27.) Some potential drawbacks of chemical control methods is
A) Development of resistance in pests
b) Water pollution due to chemical mingling
c) Harm to organisms at the end of the food chain
d) All of the above
Answer: All of the above
28.) The method of pest control that involves the use of predators and parasites
A) Chemical control method
b) Threshing method
c) Biological control method
d) Winnowing method
Answer: Biological control method
29.) ______ is the process of separating the edible part of grain crops from the crop plants called
A) Harvesting
b) Threshing
c) Winnowing
d) Combining
Answer: Threshing
30.) The term used for the food of domestic animals made from the parts of the stem and chaff
A) Fodder
b) Harvest
c) Silo
d) Granary
Answer: fodder
31.) It’s important to dry freshly harvested grains before storages
A) To prevent infestation by insects and microbes
b) To increase the nutritional value of the grains
c) To reduce the moisture content in the grains
d) To enhance the flavor of the grains
Answer: To prevent infestation by insects and microbes
32.) ____ are used for large-scale storage of grains and is moisture-proof and airtight
A) Granary
b) Silo
c) Fodder
d) Container
Answer: Silo
33.) What is the purpose of circulating nitrogen gas in granaries
A) To enhance the flavor of the stored grains
b) To maintain a specific temperature
c) To prevent infestation by pests, insects, and microbes
d) To improve the nutritional value of the stored grains
Answer: to prevent infestation by pests, insects, and microbes
34.) The percentage of carbohydrate in rice is
a) 79.1%
b) 6%
c) 0.4%
d) It is not mentioned in the passage.
Answer: 79.1%
35.) Which type of soil is preferred for cultivating Aman paddy
a) Alluvial soil
b) Clayey soil
c) Sandy soil
d) It is not mentioned in the passage.
Answer: Clayey soil
37.) At what height and leaf count are the seedlings considered suitable for transplantation in the dry seed-bed method
A) 12-15 centimeters with 5-6 leaves
b) 5-6 centimeters with 2-3 leaves
c) 20-25 centimeters with 8-10 leaves
d) It is not mentioned in the passage.
Answer: 12-15 centimeters with 5-6 leaves
38.) How is seed sowing done in the cultivation of Aush paddy?
a) Seeds are scattered or sprinkled by hand
b) Seeds are sown using a seed drill
c) Seeds are sown in furrows created behind the plough
d) All of the above
Answer: All of the above
39.)The purpose of occasional hoeing in the paddy field is
A) Controlling pests
b) Controlling weeds
c) Aerating the soil
d) Promoting seedling growth
Answer: Controlling weeds
40.) _____ standing water is needed near the base of the plants during the growing and matured condition of Aush, Aman, and Boro paddy
A) 10-30 millimeters
b) 30-50 millimeters
c) 50-100 millimeters
d) It is not mentioned in the passage.
Answer: 30-50 millimeters
41.)How is mango primarily propagated to maintain its characteristics
a) From seeds
b) Through grafting
c) By stem cuttings
d) Through tissue culture
Answer: Through grafting
42.) It is recommended to plant mango seedlings in our country
A) During winter
b) During spring
c) During summer
d) During monsoon
Answer: During monsoon
43.) The significance of polyphenols present in tea is
a) They help in reducing cholesterol levels in the blood.
b) They stimulate the nerves and are good for the heart.
c) They prevent tooth decay.
d) They prevent internal hemorrhages and inflammation.
Answer: They help in reducing cholesterol levels in the blood.)
44.) This tea plant is difficult to identify due to its origin from different plants
a) China type
b) Assam type
c) Cambod hybrid type
d) Genus Camellia
Answer: Genus Camellia
45.) Tea plants are propagated through vegetative propagation
A) By seeds
b) By stem cuttings
c) By grafting
d) By tissue culture
Answer: By stem cuttings
46.) Shade trees are important in tea cultivation
a) They absorb solar radiation
b) They provide organic matter to the soil
c) They reduce surrounding temperature
d) All of the above
Answer: d) All of the above
47.) ____ type of tea counts for nearly 75% of world tea production
A) Black tea
b) Green tea
c) Oolong tea
d) White tea
Answer: Black tea
48.) What are the different types of honeybees in a hive
a) Queen honeybee, male honeybee, and worker honeybee
b) Queen honeybee, drone honeybee, and soldier honeybee
c) Queen honeybee, worker honeybee, and forager honeybee
d) Queen honeybee, male honeybee, and soldier honeybee
Answer: Queen honeybee, male honeybee, and worker honeybee
49.) The role of worker honeybees in a hive is
a) Laying eggs
b) Breeding with the queen honeybee
c) Collecting pollen and nectar
d) Guarding the hive from predators
Answer: Collecting pollen and nectar
50.) The other product that we obtain from honeybees besides honey are
A) Wax
b) Royal jelly
c) Propolis
d) All of the above
Answer: All of the above
51.) One of them is true about carps, that they are
A) Marine fishes
B) Fishes with scales
C) Freshwater fishes without scales
D) Fishes with teeth in the jaw
Answer: Freshwater fishes without scales
52.) Name the type of carps that are commercially important
A) Indigenous carp
B) Exotic carp
C) Major carp
D) Minor carp
Answer: Major carp
53.) The spawns are collected during the breeding season
A) By trapping fish in shallow water
B) By filtering the eggs with nets
C) By using artificial methods
D) By collecting eggs from the hatchery
Answer: By filtering the eggs with nets
54.) Fertilized eggs are
A) Eggs collected from the hatchery
B) Eggs released by female fish
C) Eggs injected with pituitary extract
D) Eggs united with sperms
Answer: Eggs united with sperms
54.)_____ method is used for artificial spawn production
A) Pituitary injection method
B) Collecting eggs from the hatchery
C) Filtering eggs with nets
D) Trapping fish in shallow water
Answer: Pituitary injection method
55.) The purpose of rearing spawns in a hatchery pond?
A) To collect fertilized eggs
B) To produce adult fishes
C) To rear fry and fingerlings
D) To stock the ponds with spawns
Answer: To produce adult fishes
56.) Which layers of the pond do indigenous fishes like rohu, catla, and mrigel inhabit
A) Upper layer of water
B) Middle layer of water
C) Lower layer of water
D) All layers of water
Answer: All layers of water
57.)____ is the term used for cultivating three types of indigenous fishes in a single pond
A) Composite Fish Culture
B) Polyculture
C) Sewage-fed fish culture
D) Mixed Fish Culture
Answer: Composite Fish Culture
58.) In the context of fish culture what is meant by sewage
A) Water mixed with waste materials
B) Water with high nutrient content
C) Water contaminated with pollutants
D) Water used for treating fish diseases
Answer: Water mixed with waste materials
59.) It is the primary food source for fishes in sewage-fed fish culture
A) Fish feed pellets
B) External food supply
C) Phytoplankton
D) Zooplanktons
Answer: Phytoplankton
60.) What are the nutritional value of fish
A) High in carbohydrates and fiber
B) Rich in animal protein and essential amino acids
C) Contains high levels of vitamins E and K
D) Low in minerals and antioxidants
Answer: Rich in animal protein and essential amino acids
61.) Fowls that weigh between 2-3 kilograms belong to which breed
A) Light breed
B) Heavy breed
C) Laying breed
D) Table breed
Answer: Light breed
62.) This type of fowls incubate eggs
A) Sitter
B) Non-sitter
C) Heavy breed
D) Light breed
Answer: Sitter
63.) Battery cages are used in fowl rearing
A) To provide ample space for fowls to move freely
B) To separate fowls based on their weight
C) To facilitate easy collection of eggs and excreta
D) To promote natural incubation of eggs
Answer: To facilitate easy collection of eggs and excreta
64.) ____ method of fowl rearing allows fowls to move more freely
A) Battery cage method
B) Deep litter method
C) Free-range method
D) Incubator method
Answer: Deep litter method
65.) It is the first step in preparing the floor for the deep litter method
A) Sprinkling with lime and bleaching powder
B) Spreading the litter on the floor
C) Disinfecting the room with chemicals
D) Installing feeding and watering containers
Answer: Sprinkling with lime and bleaching powder
Q.(2) Short answer questions
(1) What do you mean by crops ?
→Plants of same kind are cultivated in larger area these plants are called as crops.
(2) Name any two Tuber crops ?
→
- Potato
- Radish
(3) What do you mean by horticulture ?
→ Horticulture is the branch of agriculture in which the process of fruit and vegetable cultivation is discussed.
(4) Give example of flowering plants ?
→
- Rose
- Jasmine
(5) Give example of vegetable plants ?
→
- Tomato
- Cauliflower
- Brinjal
(6) What are agriculture practices ?
→ Agriculture practices are the activities that farmers do for a certain period to produce crops.
(7) Name any two agriculture practices ?
→
- Harvesting
- Sowing of seeds
- Irrigation
(8) What is humus ?
→The organic matter present in the soil called as humus.
(9) How the microbes in soil helps the farmers ?
→Microbes in the soil decompose the plants and animals remains in the soil and mix the compounds and elements present in their bodies in the soil. Plants use these compounds and mineral for their growth.
(10) Name any two tools of farming ?
→
- Plough
- Hoe
(11) What is the use of plough ?
→Used for removing weed , for ploughing the field and mixing fertilizers with the soil.
(12) What is the use of hoe?
→Hoe is used for removing weeds and for loosening the soil.
(13) Which is used for ploughing nowadays ?
→ Cultivator attaches to the tractor
(14) Which is used for ploughing small garden or small flower garden ?
→ Power tiller is used .
(15) Which instrument is used for levelling the agriculture land ?
→ Harrow or leveler
(16) Which instrument is used to sow the seeds ?
→ Seed driller
(17) What farmers do to reduce chances of infection on seeds ?
→Farmers dip the seeds into the chemicals before sowing to reduce the chances of infection.
(18) Why do farmers add extra manure and fertilizers to the soil ?
→If the same soil used for repetitive cropping, then the nutrients present in the soil gets depleted. To increase the nutrient efficiency of the soil farmers, add extra manure and fertilizers into the soil.
(19) Mention the types of manure and fertilizer ?
→
- Organic manure
- Inorganic fertilizers
(20) How organic manure is produced ?
→ Organic manure is produced by decomposing the dead plants and animal Waste.
(21) Where inorganic fertilizers produced ?
→ Inorganic fertilizers are the chemical compounds produced in the chemical factories.
(22) Which are the main components of inorganic fertilizers ?
→
- Nitrogen
- Potassium
- Phosphorus
(23) What do you mean by crop rotation ?
→Cultivation of other crops like leguminous plants In between the cultivation of two same types of crops known as crop rotation.
(24) Name some common weeds.
→
- Parthenium
- Grass
- Amaranths
(25) What do you mean by weedicides ?
→ The weeds are also controlled by spraying some chemicals these chemicals are called as weedicides.
(26) What are the pests ?
→The rats and many insects like termites and weevil feed on the crops and damage the crops called as pests.
(27) What is chemical control method ?
→The pests are controlled by spraying the chemicals like DDT or BHC Which helps in controlling the insects.
(28) What is biological control method ?
→ The organisms (like parasites and Predators ) are used to control the number of other organisms called as biological control method.
(29) What is threshing ?
→ Edible part of the grain plants needs to be separated from the main crop called as threshing.
(30) What is combine?
→Harvesting and threshing both can be done by using a machine known as combine.
(31) Write the types of paddies ?
→
- Summer paddy
- Winter paddy
(32) Name the places in India where mangoes are cultivated ?
→
- West Bengal
- Malda
- Murshidabad
- Nadia
(33) Write about the nutritional value of mango ?
→Mango contains proteins fats and minerals. It also has vitamin A , beta complex and vitamin c in large numbers. Mangoes also have a water and phytochemicals.
(34) Name any two varieties of mango ?
→
- Langra
- Kesar
- Amrapali
- Alfonso
(35) Which is the world’s largest tea producing countries ?
→
- China
- India
- Turkey
- Kenya
- Sri Lanka
(36) Which is the important source of animal protein ?
→ Meat and egg of fowl
(37) Write about the nutritional value of fishes ?
→ Fishes contain some important animal proteins , essential amino acids and fatty acids. Besides fish contain many vitamins and minerals.
(38) Name two stages of fish culture?
→
- Collection of spawns
- Development of adult fish from spawns
(39) What are the two types of fisheries ?
→
- Inland
- Marine
(40) Write the stages of life cycle of honey bee ?
→
- Egg
- Larva
- Pupa
- Adult