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