Question Discussion & Solution

The Correct Answer is Cytokinin.

Key Points

• Cytokinins are a class of plant growth substances (phytohormones) that promote cell division or cytokinesis in plant roots and shoots.
• There are two types of Cytokinins: Adenine-type Cytokinins represented by Zeatin, Kinetin and 6-Benzylaminopurine and Phenylurea-type Cytokinins like Diphenylurea and Thidiazuron (TDZ).

Key Points 

• Auxins are a class of plant hormones with some morphogen-like characteristics. Auxins play a cardinal role in the coordination of many growths and behavioural processes in plant life cycles and are essential for plant body development.
• Abscisic acid is a plant hormone. ABA functions in many plant developmental processes, including seed and bud dormancy, the control of organ size and stomatal closure.
• Gibberellins are plant hormones that regulate various developmental processes, including stem elongation, dormancy, germination, flowering, flower development and leaf and fruit senescence.

 Additional Information 

The correct answer is Deforestation.

• Deforestation is not related to conservation of land resources.

Key Points

• The felling and clearing of forest cover or tree plantations to accommodate agricultural, industrial or urban use is Deforestation.
• Deforestation can also be seen as removal of forests leading to several imbalances, both ecologically and environmentally.
• According to the Global Forest Resources Assessment 2020 (FRA 2020) report, the rate of forest loss has declined in the period of 1990-2020.
• The world’s total forest area is 4.06 billion hectares (bha), which is 31% of the total land area.

Additional Information

• The FRA is released by the United Nations Food and Agriculture Organization (FAO).
• Restriction on overgrazing is done to reduce Negative effects of grazing which include overgrazing, increased soil erosion, compaction and degradation, deforestation.
• Land reclamation is the process of creating new land from oceans, seas, riverbeds or lake beds.
• Regulated use of fertilizer controls the movement of water and nutrients within the plant.

Flower is necessary for the production of Honey.

Statement 1 and 2: correct

• OS allows the computer to manage its own resource such as memory, keyboard and printer

Statement 3: correct

• OS provides the user an easy to work user interface, so the user doesn’t have to learn a different UI every time.

Statement 4: correct

The correct answer is Vinegar.

Key Points

• The substance that has a pH value lower than 7 is acidic in Nature.
• Vinegar is an aqueous solution of acetic acid and trace chemicals that may include flavourings.
• Vinegar typically contains 5–8% acetic acid by volume.
• Usually, acetic acid is produced by the fermentation of ethanol or sugars by acetic acid bacteria.

Additional Information

pH value of some useful substances:

• Common salt - about 7
• Sugar - about 7
• Ethanol - 7.33
• Vinegar - 2.5
• HCl - 3.01
• Milk - 6.5 to 6.7
• Blood - 7.35 to 7.45