Bio 1106 Plants Exam 1 Study Notes

Lesson 1: Introduction to Plant Diversity and Reproduction

  • Alternation of Generations: Understand the cycle of haploid and diploid stages in plants.

    • Mnemonic: "Sporophytes SPawn Spores; Gametophytes GAME on with Gametes."

  • Structure and Functions:

    • Flowers and Cones: Part of the sporophyte stage where gametophytes are nurtured and protected.

    • Gymnosperms ("naked seed") vs. Angiosperms ("seed in a vessel").

  • Key Innovations:

    • No water needed for fertilization, increasing adaptability to dry environments.

    • Protective structures like the Seed and Fruit enhance survival and dispersal.

Lesson 2: Plant Tissue and Organ Development

  • Embryonic Tissue Types:

    • Protoderm → Develops into epidermis.

    • Ground Meristem → Develops into ground tissue.

    • Procambium → Develops into vascular tissue (xylem and phloem).

  • Meristems: The growth zones of plants where new cells are produced.

    • Mnemonic: "MERIStems Make Every Region Increase, Sprouting new tissues."

  • Plant Organs:

    • Roots, Stems, Leaves - structure, function, and adaptations for survival.

Lesson 3: Plant Water and Nutrient Transport

  • Xylem and Phloem:

    • Xylem transports water and minerals from roots to leaves.

    • Phloem distributes sugars and hormones from sources to sinks.

  • Water Transport:

    • Cohesion-Adhesion theory and Transpiration pull demonstrate how water moves up through plants.

    • Mnemonic: "Xtra Water Moves Up, Phloem Feeds."

  • Nutrient Uptake and Transport:

    • Importance of Casparian Strip in controlling water and nutrient uptake.

Lesson 4: Nutrient Acquisition and Plant Chemical Strategies

  • Macronutrients and Micronutrients:

    • Roles in plant health and development.

    • Nitrogen Fixation: Symbiotic relationships with Rhizobium in legumes.

  • Plant Defenses:

    • Secondary Metabolites: Natural chemicals for defense and interaction with the environment.

    • Allelopathy: Chemical warfare between plants to inhibit competitors.

Lesson 5: Plant Growth Responses and Hormones

  • Plant Hormones:

    • Auxins: Promote cell growth by elongation.

    • Ethylene: Involved in fruit ripening and response to stress.

    • Abscisic Acid (ABA): Induces seed dormancy and closes stomata during drought.

  • Growth Responses:

    • Photomorphogenesis: Growth response to light quality and quantity.

    • Gravitropism and Phototropism: Growth in response to gravity and light.

Lesson 6: Advanced Plant Reproduction

  • Flower Structure and Function: Detailed breakdown of all flower parts.

  • Pollination and Fertilization: Mechanisms of self and cross-pollination.

  • Seed and Fruit Development: How seeds and fruits develop and their roles in plant lifecycle.

Mnemonics for Quick Recall:

  • SPorophytes Generate SPores, GAMetophytes Produce GAMetes - Helps remember which generation does what in the alternation of generations.

  • Xtra Water Moves Up, Phloem Feeds - To recall the functions of xylem and phloem.

  • MERIStems Make Every Region Increase, Sprouting new tissues - To remember the role of meristems.