Opposite leaf arrangement
Explication
Weeds in the Polygonaceae family are characterized by having opposite leaf arrangement, which is a key identifying feature of this plant family.
Poaceae, Cyperaceae, and Asteraceae combined
Explication
Poaceae, Cyperaceae, and Asteraceae collectively include over 50% of major weeds, with each family playing a significant role.
Induces seed dormancy without reducing the seed bank
Explication
Flame weeding can induce dormancy in weed seeds but does not eliminate the seed bank, meaning seeds can still germinate later.
Protecting the emerging shoot
Explication
The coleoptile acts as a protective sheath for the shoot as it emerges through the soil in monocots.
Vegetative (gemination) reproduction
Explication
About 65% of weed species in pots reproduce via gemination, which is a form of vegetative or asexual reproduction, allowing rapid propagation without seed formation.
Agamospermy
Explication
Agamospermy enables seed production without fertilization, allowing plants to reproduce asexually.
10-20 cm
Explication
The majority of weed seeds are concentrated within the top 10-20 cm of soil, affecting management strategies.
Raphanus raphanistrum
Explication
Raphanus raphanistrum typically emerges during winter-spring, reflecting its phenological pattern.
It can either bury or expose seeds, affecting germination
Explication
Deep cultivation can bury seeds beyond germination depth or expose them, influencing emergence and control.
Mémorisez les réponses avec 10 flashcards sur Weed Biology and Control Strategies.
Polygonaceae — leaf arrangement?
Opposite leaves
Weeds — definition?
Unwanted plants competing with crops.
Abiotic factors — critical?
Temperature and soil moisture
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