Unwanted plants that grow along with the crops are called weeds. They compete for nutrients, sunlight and water with the main crop. The process of removal of weeds is known as weeding.
Undoubtedly the most deadly plant on the planet, tobacco has managed to enslave humankind into farming it across nearly 10 million acres around the world, despite it killing over 8 million people every year – 1.3 million of whom die from second-hand smoke.
Kalanchoe integra (Never die)
Botulinum toxins, exotoxins of Clostridium botulinum, are the most toxic naturally occurring substances known to man.
Some say the hardiest are the ones in the Arctic, and some say that this plant should withstand the driest and low-humidity environment on the planet. Hence, Purple Saxifrage and Welwitschia mirabilis could be named the hardiest plants in the world.
An invasive plant as fast-growing as kudzu outcompetes everything from native grasses to fully mature trees by shading them from the sunlight they need to photosynthesize.
A weed by any other name…
Weeds are plants that grow where they are not wanted. With the exception of certain plants such as poison ivy, ragweed and invasive exotic plants like Japanese knotweed and giant hogweed, these plants are not “bad” in themselves.
I'm talking, of course, about parasitic plants. These plants thrive on stealing nutrients from other plants, either weakening them or, quite possibly, killing them. Parasitic plants connect themselves to a host plant and siphon off the sugars that plant produces and the nutrients it pulls from the soil.
A seedling is a young plant sporophyte developing out of a plant embryo from a seed. Seedling development starts with germination of the seed. A typical young seedling consists of three main parts: the radicle (embryonic root), the hypocotyl (embryonic shoot), and the cotyledons (seed leaves).
Tobacco (Nicotiana tabacum)
Despite its designation as a cardiac poison, nicotine from tobacco is widely consumed around the world and is both psychoactive and addictive. Tobacco use causes more than 5 million deaths per year, making it perhaps the most deadly plant in the world.
Musa (Banana Plants)
First on our list is the Musa or Banana plant, also known as our friends Baloo and Juma. Banana plants can be hard to care for because they're made of 80% water, which means they get very, very thirsty.
1. Orchids. Orchids are often considered the most delicate flower due to their specific care needs. Native to tropical regions, particularly in South America, orchids grow and thrive in high humidity and bright, indirect sunlight.
Zebra mussels negatively impact ecosystems in many ways. They filter out algae that native species need for food and they attach to--and incapacitate--native mussels. Power plants must also spend millions of dollars removing zebra mussels from clogged water intakes.
Out of the 13,000 alien species that have made their way around the world since colonialism began in the 15th Century, Japanese knotweed is widely regarded to be among the most intractable – smothering suburban gardens, swallowing up whole swathes of railway line, swamping canals, and creeping into national parks with ...
One gram of apple seeds contains around 0.6mg of cyanide, but the lethal dose of cyanide starts at over 50mg. This means you'd need to eat nearly 100 apple seeds in one sitting to start putting yourself at risk!
Polonium is a rare and highly radioactive element that occurs in uranium ores. Polonium-210 is about 250,000 times more toxic than hydrogen cyanide, which is itself an extremely poisonous liquid that can kill quickly in a concentrated dose.
Carbon monoxide (CO) is a gas that can kill you quickly. It is called the “silent killer” because it is colorless, odorless, tasteless and non- irritating. If the early signs of CO poisoning are ignored, a person may lose consciousness and be unable to escape the danger.