Previous Year Papers

The cumulative duration of growth phases in a cell or organ is termed as the grand period of growth.

Photoperiod, the duration of day and night, influences flowering in certain plants, dictating the seasonal bloom of flowers. Charles Darwin and his son Francis unveiled this natural phenomenon in 1880, recognizing sunlight’s role in triggering flowering cycles.

Vernalization is the process of exposing germinating seeds to low temperatures as a pretreatment, which is necessary for the flowering of certain plants.

Bolting, characterized by the elongation of internodes before flowering in rosette plants such as beet and cabbage, is a result of the influence of gibberellins.

Nitrobacter bacteria responsible for conversion of nitrite to nitrate.

Denitrification is the microbial breakdown of nitrate compounds into nitrite and Nitrogen gas. This process is facilitated by denitrifying bacteria such as Thiobacillus, Pseudomonas, Spirillum, found in the soil. These microbes play a crucial role in the natural nitrogen cycle by converting nitrates into gaseous forms, promoting nutrient recycling.

Abscisic acid functions as the stress hormone within plants.

Plants exhibit indeterminate growth, occurring continuously throughout their lifespan in specific regions where meristems are present.

Indole-3-acetic acid

The three stages of growth: 1.Cell division 2.cell enlargement 3.cell maturation constitute