Class 9 Science Chapter 12 Assertion and Reason Questions - Improvement in Food Resources

Direction: In each of the following questions, a statement of Assertion is given and a corresponding statement of Reason is given just below it. of the statements, given below, mark the correct answer as:

Q1: Assertion: Inter cropping prevents pests.
Reason: Plant pests can be controlled biologically by their natural parasites and pathogens.
(a) Both assertion and reason are true and reason is the correct explanation of assertion.
(b) Both assertion and reason are true but reason is not the correct explanation of assertion.
(c) Assertion is true but reason is false.
(d) Both Assertion and Reason are false.
Ans : (b)
Inter cropping keeps the population of insects at low level. In inter cropping, the pest-susceptible crop is grown along with other crops which are repellent to pests. Plant pests are controlled biologically through the means of their natural parasites and pathogens. For example, Bacillus thuringiensis can control cotton bollworm.

Q2: Assertion: Fish and few other varieties of aquatic animals are used as food.
Reason: Fish and other varieties of sea food constitute good source of protein.
(a) Both assertion and reason are true and reason is the correct explanation of assertion.
(b) Both assertion and reason are true but reason is not the correct explanation of assertion.
(c) Assertion is true but reason is false.
(d) Both Assertion and Reason are false.
Ans: (a)
Fish and other sea foods are used as food by a large section of the population, particularly by those living in coastal areas. Fish and sea food contain large amounts or protein. 

Q3: Assertion: Proper cleaning for cows and buffaloes is required.
Reason: Proper cleaning maintains the health of animals and also helps in clean milk production.
(a) Both assertion and reason are true and reason is the correct explanation of assertion.
(b) Both assertion and reason are true but reason is not the correct explanation of assertion.
(c) Assertion is true but reason is false.
(d) Both Assertion and Reason are false.
Ans: (a)  
Animals like cows and buffaloes require proper and regular cleaning to remove dirt and loose hair present on their body. This helps in maintaining the health of the animal and also helps in obtaining clean milk from them. 

Q4: Assertion: Fungicides act against fungal pathogens. 
Reason : Fungicides are not harmful to human beings.
(a) Both assertion and reason are true and reason is the correct explanation of assertion.
(b) Both assertion and reason are true but reason is not the correct explanation of assertion.
(c) Assertion is true but reason is false.
(d) Both Assertion and Reason are false.
Ans: (c)
Fungicides are chemicals which are effective against fungal pathogens. Fungicides are divided into two major types, inorganic and organic. Most inorganic fungicides are harmful to other living beings including humans.

Q5: Assertion: Vaccinations are given to farm animals.
Reason: Vaccinations protect the farm animals from a number of diseases caused due to virus and bacteria.
(a) Both assertion and reason are true and reason is the correct explanation of assertion.
(b) Both assertion and reason are true but reason is not the correct explanation of assertion.
(c) Assertion is true but reason is false.
(d) Both Assertion and Reason are false.
Ans: (a)
Farm animals are given vaccinations to protect them from major viral and bacterial diseases, which can even cause death of animals. 

Q6: Assertion: Large schools of fish are located using radio signals.
Reason: Radio signals help in increasing the fish yield.
(a) Both assertion and reason are true and reason is the correct explanation of assertion.
(b) Both assertion and reason are true but reason is not the correct explanation of assertion.
(c) Assertion is true but reason is false.
(d) Both Assertion and Reason are false.
Ans: (d)
Large schools of fish are located using satellites and echo-sounders. This helps in increasing the yield as large number of fish can be caught at the same time. Radio signals are not used for catching fish.

Q7: Assertion: Usage of manure is advantageous for our environment.
Reason: Manure contains chemical substances like nitrogen, phosphorus and potassium.
(a) Both assertion and reason are true and reason is the correct explanation of assertion.
(b) Both assertion and reason are true but reason is not the correct explanation of assertion.
(c) Assertion is true but reason is false.
(d) Both Assertion and Reason are false. 
Ans: (c)  
Usage of manure is advantageous for our environment as manure contains large quantities of organic matter. It is prepared by decomposition of animal excreta and plant wastes. It helps in enriching the soil with nutrients and organic matter, increasing soil fertility and its water holding capacity. Manure do not contain chemical substances. Fertilizers contain chemical substances like nitrogen, phosphorus and potassium.

Q8: Assertion: To replenish the lost nutrients in the soil, quick acting, handy nutrients are applied in the form of fertilizers.
Reason: Chemical fertilizer contains the necessary plant nutrients.
(a) Both assertion and reason are true and reason is the correct explanation of assertion.
(b) Both assertion and reason are true but reason is not the correct explanation of assertion.
(c) Assertion is true but reason is false.
(d) Both Assertion and Reason are false.
Ans: (a)
Fertilizers are inorganic or organic compounds containing one or more essential plant nutrients which are used for increasing the fertility of soil. They are manufactured commercially from chemicals and are marketed in concentrated form.

Q9: Assertion: Honey bees are nuisance to farmers.
Reason: Bees destroy the crops to fulfil their nutritional requirements.
(a) Both assertion and reason are true and reason is the correct explanation of assertion.
(b) Both assertion and reason are true but reason is not the correct explanation of assertion.
(c) Assertion is true but reason is false.
(d) Both Assertion and Reason are false.
Ans: (d)
Honey bees help farmers as they are pollinators of many crop species. Bees do not destroy the crops rather suck the nectar from the flower and make honey from it which is food for them.

Q10: Assertion: Fumigation of the grains using chemicals is done before storage in warehouses.
Reason: Fumigation gives a nice colour to the grains.
(a) Both assertion and reason are true and reason is the correct explanation of assertion.
(b) Both assertion and reason are true but reason is not the correct explanation of assertion.
(c) Assertion is true but reason is false.
(d) Both Assertion and Reason are false.
Ans: (c)
Fumigation of the grains using chemicals is done before storage in warehouses to protect them from pests like insects, rodents, fungi, mites and bacteria. It does not give a nice colour to the grains.