Plants

What is the significance of the song 'Bein Green'?

It encourages appreciation for oneself despite feeling ordinary, highlighting the beauty of being unique.

What is the role of meristems in plants?

Meristems are similar to stem cells and are responsible for the extension of shoots and roots.

What do apical meristems give rise to?

They give rise to primary tissues, collectively called the primary plant body.

What are the two types of lateral meristems in woody plants?

Cork cambium, which produces outer bark, and vascular cambium, which produces secondary vascular tissue.

What is the main component of wood?

Secondary xylem.

What are the four regions of root organization?

1. Root cap 2. Zone of cell division 3. Zone of elongation 4. Zone of maturation.

What is the function of root hairs?

Root hairs anchor the plant and absorb water and nutrients.

What is the difference between sporophyte and gametophyte in plant life cycles?

Sporophyte is the multicellular diploid stage, while gametophyte is the multicellular haploid stage.

What type of life cycle do plants have?

Plants have a haplodiplontic life cycle.

What are the two major clades of green algae?

Chlorophytes and Charophytes.

What is the significance of Charophytes in relation to land plants?

Charophytes are the closest relatives to land plants.

What adaptations do plants have for life on land?

1. Protection from desiccation 2. Development of vascular tissue 3. Leaves for photosynthesis.

What is the function of stomata in plants?

Stomata are tiny openings that allow for gas exchange.

What is the role of xylem in vascular plants?

Xylem conducts water and minerals.

What does phloem conduct in vascular plants?

Phloem conducts carbohydrates.

What is the evolutionary significance of vascular tissue?

It allows plants to adapt to dry environments and grow larger.

What are rhizoids?

Root-like, hair-like filaments that anchor non-vascular plants and absorb water.

What is the primary function of gametangia in mosses?

Gametangia form at the tips of gametophytes and produce gametes.

What is the function of the WEREWOLF (WER) gene in plants?

The WER gene suppresses root hair development.

What is the main characteristic of non-vascular plants?

They are usually low to the ground and tied to water for reproduction.

What type of reproduction do liverworts exhibit?

They reproduce both sexually and asexually, producing spores in gemmules.

What is the significance of the colonization of land by early plants?

It marked the transition of life from water to land, allowing for new ecological niches.

What are the characteristics of the earliest plants?

They were non-vascular, low to the ground, and dependent on water for reproduction.

What type of plants are classified under Phylum Bryophyta?

Mosses.

What is the role of the columella cells in roots?

Columella cells are involved in gravity perception and root cap function.

What is the difference between primary and secondary growth in plants?

Primary growth increases length, while secondary growth increases diameter.

What are the main components of ground tissue in plants?

Ground tissue includes parenchyma, collenchyma, and sclerenchyma.

What is the dominant generation in the alternation of generations for advanced plants?

The dominant diploid generation.

What phylum do club mosses belong to?

Phylum Lycophyta.

How many species of club mosses are there?

Approximately 1000 species.

What is a notable characteristic of Lycopodium dendroideum?

It is an endangered species of club moss.

What is the only genus of quillworts?

Isoetes, which has over 60 species.

Which phylum do horsetails belong to?

Phylum Arthrophyta.

What is the significance of the Equisetum genus?

It includes horsetails and may be the oldest living plant.

What is the estimated age of the fossil forms of horsetails?

300 million years ago.

How many species are in the phylum Pterophyta?

Approximately 12,000 species.

What is the significance of the Arctic Azolla Event?

It reduced CO2 levels by half over 800,000 years.

What type of spore do most ferns produce?

Homosporous spores.

What is the main characteristic of whisk ferns?

They have evenly forking green stems without leaves or roots.

What was the Devonian Explosion?

A rapid evolution of land plants including ferns and seed plants.

What is the significance of the Gilboa Forest?

It is a 385-year-old forest located in the Catskills.

What did the Carboniferous period contribute to the atmosphere?

It raised the oxygen concentration to 35% due to the burial of dead trees.

What is lignin's role in early trees?

It provided compressive strength to wood.

What are gymnosperms known for?

They are seed plants with 'naked seeds'.

What is the tallest living vascular plant?

Sequoia sempervirens.

What is unique about Ginkgo biloba?

It is the only living species of its phylum and is resistant to air pollution.

What adaptations do angiosperms have for reproduction?

They produce flowers and fruits, aiding in pollination and seed dispersal.

What is the oldest known flowering plant?

Archaefructus liaoningensis, dating back to 147 million years ago.

What is the role of Class A Genes in flower development?

They are responsible for sepal development and petal formation.

What do Class C Genes govern in flower development?

The development of stamens and carpels.

What is the significance of the Meristem Identity Genes?

They initiate flower formation by converting vegetative shoots to floral meristems.

What is the primary source of vegetable food for humans?

Angiosperms, which provide 90% of our food from just 100 species.

What is the function of the ovary in angiosperm flowers?

It contains ovules that develop into fruit.

What is the evolutionary significance of pollen in seed plants?

It allows for long-distance reproduction.

What is the primary function of fruits in flowering plants?

To protect seeds and aid in their dispersal.

What is double fertilization in plants?

It involves two sperm nuclei; one fertilizes the egg cell to form a zygote, and the other fuses with the central cell to form the primary endosperm cell.

What are cotyledons?

The first leaves of a plant, also known as seed leaves, which store food for the embryo.

How are angiosperms classified based on cotyledons?

They are classified as monocots (1 cotyledon) or dicots (2 cotyledons).

Give examples of monocotyledons.

Examples include lilies, grasses, palms, and orchids.

What are the leaf vein patterns in monocots?

Monocots have parallel veins in their leaves.

What are the characteristics of dicotyledons?

Dicots have netlike or reticulate veins and include most trees and shrubs.

How do the floral structures differ between monocots and dicots?

Monocots typically have floral parts in multiples of three, while dicots have them in fours or fives.

What is the significance of endosperm in seeds?

Endosperm surrounds and nourishes the embryo; it is usually present in mature seeds of monocots and often absent in dicots.

What role do plants play in ecosystems?

Plants are primary producers, providing habitats, food, and oxygen while removing CO2 through photosynthesis.

What is photosynthesis?

The process by which autotrophic organisms convert light energy into chemical energy, producing glucose and oxygen from carbon dioxide and water.

What are the two main stages of photosynthesis?

The light reactions and the Calvin cycle.

Where does photosynthesis occur in plants?

Photosynthesis occurs in the chloroplasts of plant cells.

What is the function of chlorophyll in plants?

Chlorophyll absorbs light energy for photosynthesis and gives plants their green color.

What do light reactions produce?

Light reactions convert solar energy into chemical energy, producing ATP and NADPH.

What is the Calvin cycle?

The Calvin cycle uses ATP and NADPH from light reactions to synthesize sugars from carbon dioxide.

What is coevolution in the context of plants and pollinators?

Coevolution refers to the mutual evolutionary influence between plants and their pollinators.

What adaptations do bees have for pollination?

Bees have fuzzy bodies that collect pollen and are attracted to blue or yellow flowers.

How do birds contribute to plant pollination?

Birds are attracted to red flowers that produce large amounts of nectar and are odorless.

What is phytoremediation?

The use of plants to concentrate or break down pollutants in the soil.

What are carnivorous plants adapted for?

Carnivorous plants are adapted to grow in nutrient-poor soils and trap small animals for additional nutrients.

What are some examples of chemical defenses in plants?

Plants may produce toxins or strong flavors to deter herbivores, such as alkaloids in wild tobacco.

What is the significance of secondary metabolites in plants?

Secondary metabolites can have medicinal benefits for humans, such as taxol for cancer treatment.

What is the role of mycorrhizal fungi in plant health?

Mycorrhizal fungi enhance nutrient uptake for about 90% of vascular plants.

What is the impact of heavy metals on plants?

Heavy metals can be toxic to animals and can accumulate in plants, posing risks to herbivores.

What is the function of the Venus flytrap?

The Venus flytrap captures and digests insects using modified leaves that snap shut.

What is the significance of the Madagascar Periwinkle?

It is used in chemotherapy for treating various cancers due to its medicinal properties.

How do parasitic plants obtain nutrients?

Parasitic plants may be photosynthetic or non-photosynthetic and rely on host plants for nutrition.

What is the ecological role of self-pollinators?

Self-pollinators do not require pollinator visits and can produce high numbers of genetically identical individuals.

What are some adaptations of pitcher plants?

Pitcher plants have cavity-filled leaves that trap and digest prey, often using digestive fluids.

What is the role of toxins in plant defense?

Toxins can kill herbivores or make them ill, deterring them from feeding on the plant.