Plant Physiology Honor

Nature Study

Requirements

  1. What characteristics classify a living being as a plant (Kingdom Metaphyta)?

    Answer: Kingdom Plantae: autotrophs (photosynthesis), multicellular eukaryotes, cellulose, chloroplasts, sexual/asexual reproduction, alternation of generations. Immobile, producers in the food chain. — The classification of the Kingdom Plantae follows Whittaker (1969) with 5 kingdoms, with characteristics adapted to the terrestrial environment. USP botanical research details the physiological characteristics, being the basis of the study of Biology in Brazilian schools officially today.

  2. Name the 4 major groups of plants and their distinctive characteristics. Which are considered the simplest and which are the most complete?

    Answer: Bryophytes (mosses, no vessels), pteridophytes (ferns, vessels without seeds), gymnosperms (naked seeds), angiosperms (flowers and fruits). Bryophytes are simple; angiosperms more complex. — Classical botanical classification dates from Linnaeus (1735), with evolution marked by the emergence of vessels, seeds, flowers and fruits. Brazilian researchers such as Rolla Hoehne contributed to classification in Brazil, being the basis of teaching today, officially in use.

  3. Name the functions of the parts of the plant:
    • Root
    • Stem
    • Leaf
    • Fruit
    • Flower

    Answer: 1) Root: fixes the plant in the soil and absorbs water and mineral salts (raw sap); in some plants it also stores nutrient reserves. 2) Stem: supports the plant and connects the root to the leaves, conducting the raw sap upward and the elaborated sap (produced in the leaf) to the rest of the plant. 3) Leaf: carries out photosynthesis, capturing light and carbon dioxide to produce the plant's food; it also performs transpiration and gas exchange (respiration). 4) Fruit: protects the seeds and helps to disperse them; it is often fleshy and attracts animals, which spread the seeds. 5) Flower: is the plant's reproductive organ; after pollination and fertilization, it gives rise to the fruit and the seeds. — Plant structure has been studied by botanical morphology since Goethe (1790), with each organ having a specific function. Embrapa researches adaptations by Brazilian biome, being the basis of elementary education according to the BNCC, officially in national use today.

  4. What is photosynthesis and what is its purpose? Which living beings are capable of doing photosynthesis? What is the chemical formula of photosynthesis?

    Answer: Photosynthesis: a process in which plants and bacteria produce food using sunlight. Performed by: plants, algae and cyanobacteria. Formula: 6CO2 + 6H2O + light → C6H12O6 + 6O2. Purpose: to produce glucose and oxygen to sustain life on Earth. — Photosynthesis was discovered by Jan Ingenhousz in 1779, being studied in Biology. Chloroplasts with chlorophyll absorb red/blue light, being an essential process for terrestrial life according to USP studies, officially in use today in global teaching.

  5. What is xylem and phloem? What is their function?

    Answer: Xylem: conducts water and salts from the root to the leaves, dead cells with lignin. Phloem: conducts elaborated sap (glucose) from the leaves to the body, living cells. Together they form the vascular system. — Xylem and phloem are fundamental in vascular plants (pteridophytes, gymnosperms, angiosperms), being discovered by Marcello Malpighi (1675). Brazilian researchers study adaptations at USP and UFRJ, officially in use today in national botanical research.

  6. Name 5 plant hormones and their functions.

    Answer: Auxin (growth), gibberellin (germination, elongation), cytokinin (cell division), ethylene (ripens fruits), abscisic acid (dormancy, closes stomata). Each one regulates processes. — Plant hormones were discovered by Frits Went (1928) with auxin, being an advanced molecular study. Brazilian research at ESALQ/USP tests agricultural application, being important in fruit growing and silviculture according to Embrapa data today, officially.

  7. How does transpiration occur in plants? What is its importance for their development?

    Answer: Transpiration: the loss of water as vapor through the stomata. It refreshes the plant, creates pressure that raises the sap through the xylem, maintains homeostasis. Stomata open/close due to light, humidity and CO2. — Transpiration is fundamental for plant survival, with the movement of water by mass flow explaining the rise of sap in tall trees. USP research details the mechanisms, with Embrapa researching adaptations to the Brazilian climate, officially in use today.

  8. Talk about the gynoecium and the androecium, naming their parts and functions.

    Answer: Gynoecium (female): carpels with a stigma (receives pollen), style, ovary (ovules). Androecium (male): stamens with an anther (pollen) and filament. Together they form the floral reproductive system. — Floral anatomy has been studied by botany since Linnaeus (1735), being the basis of angiosperm reproduction. Researchers such as Hoehne contributed to Brazilian taxonomy, being knowledge used in the improvement of horticultural plants officially today.

  9. Name at least 1 biblical story that compares a plant with the spiritual life. Explain it.

    Answer: Parable of the vine (John 15:1-8): Jesus says 'I am the vine, ye are the branches'. It compares communion with Christ to a plant united to the trunk. Without spiritual union, the Christian life withers. — The parable is central in Adventist theology, with the symbolism of the vine/branches representing spiritual abiding with Christ. Sabbath School manuals detail the devotional application, being the basis of sermons among Brazilian pathfinders, officially in use today.