Explanation of events that occur plants along the growth curve

Explanation of events that occur plants along the growth curve

(a) Name the different stages of plant growth curve

  • A – B: lag phase/establishment stage
  • B – C: logarithmic stage/rapid growth stage
  • C – D: steady stage/maturation stage
  • D – E : decline stage/senescence

(b) State four physiological events that occur between A and B (04marks)

  • Hydrolysis of storage food material
  • Synthesis of enzymes, nucleic acids, structural proteins
  • Respiration to provide energy for cellular activities
  • Glucose and amino acids are translocated from the storage centre (endosperm or cotyledon) of the seed to the growing regions of the embryo.
  • Cell division, elongation and differentiation leads to immergence of a seedling from a seed.

(c) Account for rapid increase in dry matter yield between B and C (02marks)

  • Rapid cell multiplication due to presence of many cells
  • Absence of diseases and other environmental resistance.
  • Absence of pollutants

(d) Suggest two causes of the decline in dry matter yield between A and E

High-rate cell death caused

  • Accumulation of waste/toxic materials in plant that inhibit growth
  • Diseases
  • Predators/parasite
  • Lack of water towards dry season

Please find free downloadable notes, exams and marking guides of agriculture, biology, and chemistry from digitalteachers.co.ug website.

Dr. Bbosa Science

Share This


Wordpress (0)
Disqus (0 )