Week 15: Wind as an ecological factor and its importance. Population Ecology: Introduction. A brief description of seed dispersal and seed bank
Air in motion is called wind. The action of wind act is an ecological factor. Its affects may be direct or indirect. Direct effects of wind are
- Plant may be uprooted and blown away by storm wind. The continuous, unidirectional wind pressure direct the plant and their branches toward the lowered side.
- The branches of large trees are broken.
- Strong wind Carriess sand particles which cause abrasive damage.
Indirect effects
- increase rate of transmission.
- Stunted growth
- Soil erosion
- Dispersal of pollen grain, seed and fruit
The study of interaction of population of an area to its non living physical environment.
Population is the study of one species occupying an area. But it depend on other resources for food and shelter. Therefore population ecology interacts with community ecology. The population ecology is not an isolated subject. It includes many other aspect of ecology.
Seed is an important source of dispersal of species of plants and responsible for genes dispersal of a population of plants to other places.
Seed bank: The storage of seed in the soil is called seed bank. Seed bank play an important role in primary succession. Seed bank regulate the population size of the plants in the normal conditions.
Download Files
- Week 1:Water relations to plants (water potential, osmotic potential, pressure potential,matric potential).
- Week 2: Absorption and translocation of water. Stomata regulation.
- Week 3: Mineral nutrition: Soil as a source of minerals. Passive and active transport of nutrients.
- Week 4: Essential mineral elements, role and deficiency symptoms of macronutrients.
- Week 5: Photosynthesis: Introduction, Oxygenic and non-oxygenic photosynthesis Mechanism: light reactions (electron transport and photophosphorylation) and dark reactions (Calvin cycle).
- Week 6: Differences between C3 and C4plants.Factors affecting this process, Products of photosynthesis.
- Week 7: Respiration:Definition and respiratory substrates. Mechanism of Glycolysis,Krebscycle.
- Week 8: Electron transport and oxidative phosphorylation, Anaerobicrespiration
- Week 9: Mid term examination
- Week 10: Energy balance in aerobic and anaerobic respiration, Respiratory quotients
- Week 11: Introduction, aims and applications of ecology
- Week 12: Physical and Chemical properties of soil (soil formation, texture. pH, EC, organism and organic matter etc.) and their relationships to plants
- Week 13: Light and Temperature. Quality of light, diurnal and seasonal variations.Ecophysiological responses.
- Week 14: Field capacity and soil water holding capacity. Characteristics of xerophytes and hydrophytes. Effect of precipitation on distribution of plants
- Week 15: Wind as an ecological factor and its importance. Population Ecology: Introduction. A brief description of seed dispersal and seed bank
- Week 16: Community Ecology, Ecological characteristics of plant community, Methods of sampling vegetation (Quadrate and line intercept), Major vegetation types of the local area.
- Week 18: Final Term Examination
- Chapters 17
- Department Botany
- Teacher
Mr. Asghar Ali Ansari
