Official / Original (Previous Year – Old) Solved Question Paper of GATE Life Sciences (XL) 2018(Botany) with Answer Key and Explanations as PDF. GATE XL aspirants can download the question paper as single PDF file for your exam preparation. Please feel free to inform us for any mistakes in the answer key provided.
To downloadthe question paper, please click on the download link below the preview…
Short-Day Plants vs Long-Day Plants (Similarities and Differences between Short-Day Plants and Long-Day Plants)
Photoperiodism is the response of plants (or any organism) to the lengths of dark and light periods in a day. The changes in the duration of light and dark periods in a day are called photoperiods. In plants, the photoperiodism induces flowering. Based on the response towards photoperiodism, the plants are classified into two categories – Short-day plants (SDPs) and Long-day plants (LDPs).
Short-day plants (SDPs): These plants flower only in short days or their flowering is induced by short days. These plants cannot flower under the short nights.
Long-day plants (LDPs): These plants flower only in long days or their flowering is induced by long days.
The present post discusses the Difference between Short-day plants and Long-day plants with a Comparison Table.
Photoperiodism vs Vernalization Similarities and Differences between Photoperiodism and Vernalization in Plants
The Photoperiodism is defined as the developmental responses of plants to the relative lengths of light and dark periods. It is a physiological reaction of plants to the length of day or night time. Plants sense the seasons by sensing the variations in photoperiods (length of day and night times in a day). The most important response of photoperiodism in plants is the induction of flowering. The Vernalization is a process of induction of flowering in plants by exposing them to prolonged cold temperature. The present post discusses the Similarities and Differences between Photoperiodism and Vernalization in Plants with a Comparison Table.
Similarities between Photoperiodism and Vernalization
Ø Both Photoperiodism and Vernalization are physiological process in plants.
Ø Both influence the flowering in plants.
Ø Both processes are mediated through plant hormones.
Gibberellic Acid (GA) vs Abscisic Acid (ABA) (Difference between the Physiological Effects of Gibberellic acid and Abscisic Acid in Plants)
Gibberellin (Gibberellic Acid) and Abscisic Acid (ABA) are two important plant hormones. Plant Hormones also called ‘Phytohormones’ or ‘Plant Growth Substances’, are signaling molecules produced in very minute quantities in the plants that have immense physiological and metabolic effects. They regulate the growth and development of plants.
The present post discusses the Difference between the Physiological effects of Gibberellin (Gibberellic Acid) and Abscisic Acid (ABA) in plants with a Comparison Table.
Gibberellic Acid: Gibberellic acid or gibberellin, abbreviated as GA, is a major phytohormone produced by some plants and microbes (fungi) which promote the growth and cell elongation. Gibberellic acid was first identified in Japan as a metabolic by-product of a plant pathogenic fungus called Gibberella fujikuroi. The infection of rice plants with this fungi cause a disease called ‘bakane’ meaning ‘foolish seedlings’. The diseased plants will grow much taller than the normal and they eventually die because they are not sturdy enough to support their own weight. The excessive elongation of the internodes in these infected plants was found be to be due to the effect of Gibberellic acid produced by the pathogen.
Flower vs Vegetative Branch (Difference between Flower and Reproductive Shoot)
The flower is the reproductive structure formed in the plant group Angiosperms or Magnoliophyta, commonly called as the ‘Flowering Plants’. The flower is a ‘modified branch’ or axis developed from a ‘determinate’ apical meristem. The term ‘determinate’ indicates the absence of further growth of the apical meristem after the production of flowers. Even though the flower is a modified shoot, the morphological and anatomical features of a flower and a vegetative branch show many differences. The present post discusses the Difference between a Flower and a Vegetative Branch with a Comparison Table.