Home
Class 12
BIOLOGY
Assertion: Chemical fertilisers and pest...

Assertion: Chemical fertilisers and pesticides are not only expensive but also pose environmental hazards.
Reason: Any mismanagement during application of chemical
fertilisers and pesticides is likely to cause damage not only to crops
but also to man.

A

If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion

B

If both Assertion and Reason are true and the Reason is not
the correct explanation of the Assertion.

C

If Assertion is true but the Reason is false.

D

If both Assertion and Reason are false.

Text Solution

AI Generated Solution

The correct Answer is:
### Step-by-Step Solution: 1. **Understanding the Assertion**: The assertion states that chemical fertilizers and pesticides are not only expensive but also pose environmental hazards. This means that their cost is high and their use can lead to negative effects on the environment. 2. **Evaluating the Reason**: The reason provided explains that mismanagement during the application of these chemicals can cause damage to crops and humans. This implies that improper use can lead to harmful consequences. 3. **Analyzing the Truth of the Assertion**: Chemical fertilizers and pesticides are indeed costly. Additionally, they can lead to soil pollution, water pollution, and health issues in humans and animals when they accumulate in the body. Therefore, the assertion is true. 4. **Analyzing the Truth of the Reason**: Mismanagement, such as over-application of these chemicals, can lead to various diseases in plants and can also affect animals and humans who consume these plants. This makes the reason true as well. 5. **Connecting Assertion and Reason**: The reason explains why the assertion is true. The environmental hazards posed by chemical fertilizers and pesticides are indeed linked to their mismanagement during application. 6. **Conclusion**: Both the assertion and the reason are true, and the reason provides a correct explanation for the assertion. ### Final Answer: Both the assertion and reason are true, and the reason is the correct explanation of the assertion. ---
Promotional Banner

Topper's Solved these Questions

  • MICROBES IN HUMAN WELFARE

    ICSE|Exercise COMPETITION CORNER (OBJECTIVE TYPE QUESTIONS (MULTIPLE CHOICE QUESTIONS))|44 Videos

  • ISC BOARD PAPER (2019 -BIOLOGY)

    ICSE|Exercise PART-II ( SECTION-C)|12 Videos

  • MOLECULAR BASIS OF INHERITANCE

    ICSE|Exercise MCQ (Source Based Questions)|23 Videos

Similar Questions

Explore conceptually related problems

Assertion : Biofertilisers are preferred to chemical fertilisers. Reason : Chemical fertilisers are generally more expensive and hazardous to environment.

Assertion: Biofertilisers are preferred to chemical fertilisers. Reason: Most of the chemical fertilisers are expensive, hazardous and damage the environment.

Assertion : the disadvantages of chemical pesticides can be overcome by the use of biopesticides. Reason: Biopesticides are the harmless pesticides of biological orgin which are used to cotrol weeds and pests without causing any significant damage .

Consider the following four statemets (A - D) related to organic farming and select the correct option stating which ones are true (T) and which ones are false (F). The statements: (A) Produces food crops rich in lipids, vitamins and iron (B) Users biofertilisers which increases soil fertility (C ) There is more use of chemical fertilisers and pesticides (D) Raising unpolluted crops throuth the use of bacteria, fungi and cyanobacteria

Answer question numbers 3(a) - 3(d) on the basis of your understanding of the following paragraph and the related studied concepts: Around the year 1800, only 30 elements were known. Dobereiner in 1817 and Newlands in 1866 tried to arrange the then known elements and framed laws which were rejected by the scientists. Even after the ejection of the proposed laws, many scientists continued to search for a pattern that correlated the properties of elements with their atomic masses. The main credit for classifying elements goes to Mendeleev for his most important contribution to the early development of a Periodic table of elements wherein he arranged the elements on the basis of their fundamental property, the atomic mass and also on the similarity of chemical properties. The formula of their hydrides and oxides were treated as basic criteria for the classification of the elements. However, Mendeleev's classification also had some limitations as it could not assign the position to isotopes. He also left some gaps in the periodic table. 3(a) state Mendeleev's Periodic Law. 3(b) Why did Mendeleev leave some gaps in the Periodic table? 3(c) if the letter 'R' was used to represent any of the elements in the group , then the hydride and oxide of carbon would respectively be represented as (i) RH_4 , RO (ii) RH_4 , RO_2 (iii) RH_2 , RO_2 (iv) RH_2 , RO 3(d) isotopes are (i) atoms of an element with similar chemical properties but different atomic masses. (ii) atoms of different elements with similar chemical properties but different atomic masses. (iii) atoms of an element with different chemical properties but same atomic masses. (iv) atoms of different elements with different chemical properties but same atomic masses.