BS Biology 1: Sunflower Classification

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Questions and Answers

What is a defining characteristic of dicots?

  • Their flowers are always red.
  • They typically have one cotyledon.
  • They do not produce seeds.
  • Their leaves have a net-like vein pattern. (correct)

Which order is known for its composite flower heads?

  • Asterales (correct)
  • Orchidales
  • Rosales
  • Lamiaceae

What is the scientific name of the sunflower?

  • Helianthus tuberosus
  • Helianthus dioicus
  • Helianthus maximilianii
  • Helianthus annuus (correct)

What role do sunflowers play in the ecosystem?

<p>They produce oxygen and are a food source. (C)</p> Signup and view all the answers

What is the arrangement of flowers in the Asteraceae family?

<p>Flower heads made of many small florets. (A)</p> Signup and view all the answers

Which of the following features is characteristic of plants?

<p>They have chloroplasts and carry out photosynthesis. (A)</p> Signup and view all the answers

What is unique about the flower head of sunflowers?

<p>It is made up of many small florets grouped together. (D)</p> Signup and view all the answers

What distinguishes angiosperms from other plants?

<p>They have distinct reproductive structures known as flowers. (D)</p> Signup and view all the answers

What type of venation do dicots typically exhibit?

<p>Reticulate venation. (C)</p> Signup and view all the answers

What is a fundamental characteristic of flowering plants?

<p>They produce seeds enclosed within a fruit. (A)</p> Signup and view all the answers

What is the involucre in relation to sunflowers?

<p>A whorl of bracts at the base of the flower head. (C)</p> Signup and view all the answers

Which feature is common among plants in the tribe that includes sunflowers?

<p>They exhibit unique morphological and genetic characteristics. (C)</p> Signup and view all the answers

Which part of the sunflower flower is specifically designed to attract pollinators?

<p>The bright yellow petals (C)</p> Signup and view all the answers

Which of the following classes do sunflowers belong to?

<p>Magnoliopsida (C)</p> Signup and view all the answers

What type of organisms are sunflowers classified as?

<p>Autotrophic organisms (B)</p> Signup and view all the answers

What common trait is shared by sunflowers in the Helianthus genus?

<p>Heliotropic behavior (C)</p> Signup and view all the answers

Which is NOT a characteristic feature of sunflowers?

<p>Being an aquatic plant species (B)</p> Signup and view all the answers

Which characteristic distinguishes Helianthus annuus from other Helianthus species?

<p>Large, single flower heads (B)</p> Signup and view all the answers

What is a primary aspect of the sunflower's morphology?

<p>Structure of the flower head (B)</p> Signup and view all the answers

What type of stems do sunflowers in the Helianthus genus typically have?

<p>Tall and erect stems (D)</p> Signup and view all the answers

Which of the following is NOT a common characteristic of sunflowers in the Helianthus genus?

<p>Growth in wetland areas (A)</p> Signup and view all the answers

What color are the ray florets of Helianthus annuus?

<p>Bright yellow (A)</p> Signup and view all the answers

What type of genetic composition is unique to Helianthus annuus?

<p>Specific genetic markers (D)</p> Signup and view all the answers

What ecological niche does Helianthus annuus typically occupy?

<p>Open fields and gardens (C)</p> Signup and view all the answers

Flashcards

Autotrophic

Organisms that are able to produce their own food, typically through photosynthesis.

Sessile

Organisms that cannot move on their own and are permanently attached to a surface.

Photosynthesis

The process by which plants use sunlight to produce energy.

Angiosperms

Flowering plants that produce seeds enclosed in fruits.

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Cellulose

The outermost layer of a plant's cell wall, composed of cellulose.

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Flowers

Structures designed to attract pollinators for sexual reproduction.

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Pollination

A process involving the transfer of pollen from an anther to a stigma, leading to fertilization and seed production.

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Fruits

The reproductive structures of flowering plants that develop from the flower after fertilization.

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Tribe (Heliantheae)

A large group of plants within a family that share specific features.

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Genus (Helianthus)

A group of related plants within a tribe that have common characteristics.

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Species (Helianthus annuus)

A specific type of plant within a genus with unique traits.

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Ray and Disk Florets

The arrangement and structure of the small flowers that make up the larger sunflower head.

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Heliantheae Features

Traits that distinguish a sunflower from other plants in the same tribe.

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Helianthus Features

Features that distinguish a sunflower from other sunflowers in the same genus.

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Helianthus annuus Features

Unique characteristics that define a specific sunflower species.

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Heliotropism

The movement of a plant in response to sunlight.

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Dicots

A plant group characterized by two seed leaves (cotyledons) in their embryos, often having net-like veins in their leaves.

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Asterales (Order)

A group of flowering plants with a distinctive composite flower head, made up of many small florets grouped together.

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Asteraceae (Family)

A large and diverse family of flowering plants, typically possessing a head of small florets surrounded by bracts.

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Heliantheae (Tribe)

A group of plants within the Asteraceae family sharing floral and growth characteristics. Sunflowers belong to this tribe.

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Cotyledons

The two seed leaves present in the embryo of a dicot plant.

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Composite Flower Head

A cluster of many small flowers grouped together to form a larger, single flower-like structure.

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Involucre

A whorl of bracts at the base of a flower head, typically in Asteraceae plants.

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Study Notes

BS Biology 1 Study Notes

  • Members: Ignacio, Carmel Grace, Carlos, Wendy, Garcia, Ken Hofer
  • Group Number: 13
  • Date: November 12, 2024
  • CN: 0503
  • Subject: Sunflower (scientific name: Helianthus annuus)

Classification of Sunflower

  • Kingdom: Plantae
  • Division: Magnoliophyta
  • Class: Magnoliopsida
  • Order: Asterales
  • Family: Asteraceae
  • Tribe: Heliantheae
  • Genus: Helianthus
  • Species: Helianthus annuus

Sunflower Characteristics

  • Autotrophic and Sessile: Sunflowers are autotrophic organisms, meaning they make their own food through photosynthesis. They are mostly sessile, meaning they don't move.
  • Ecosystem Role: They play a vital role in ecosystems by producing oxygen and forming the base of the food chain.
  • Flower Structure: The sunflower has a composite flower head, made of many small florets. This is a defining characteristic of the Asteraceae family.
  • Reproductive Structures: Sunflowers have true flowers with distinct reproductive structures enabling sexual reproduction.
  • Pollination: Their bright yellow flowers attract pollinators, which facilitate the sexual reproduction process.
  • Fruit Development: The seeds develop within the structure of the flower, which turns into a fruit that encloses seeds.
  • Dicotyledonous: Sunflowers are dicots, typically having two cotyledons in their seeds, and often featuring net-veined leaves in their anatomy.
  • Inflorescence: They have a characteristic disk and ray floret arrangement, which is a type of inflorescence typical of the Asteraceae family.
  • Heliantheae Characteristics: Features related to florets, growth forms, and morphological aspects group sunflowers with other members of the Heliantheae tribe.
  • Helianthus Traits: Shared common traits like overall plant appearance (tall and erect stems), flower head structure, and various aspects of growth and reproduction distinguish species in the Helianthus genus.
  • Heliotropic Behavior: The sunflower follows the sun's path throughout the day, a behavior called heliotropism.

Significance of Sunflower Study

  • Classification Hierarchy: Understanding the taxonomic classification (kingdom, phylum, etc.) clarifies the sunflower's place in the plant kingdom.
  • Key Plant Characteristics: The study highlights fundamental characteristics of flowering plants, like the presence of flowers for sexual reproduction and the role of pollinators.
  • Developmental Stages: Details about the flower structure, embryo development, and reproduction process are presented.

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