If a cell is needing energy more than the other cells, does it mean that it has more mitochondria or the activity of them is more?
Tracheophyte size was only possible due to adaptations that made possible the support of the living organism and the availability and transport of water to all cells. The support of a tracheophyte is due to the existence of specialized tissues for this function: the collenchyma and sclerenchyma, which we will see below.
What do a spaceship, a house, and a business have in common? The answer is that there are several volatile chemical substances that can make the air you breathe in these environments up to ten times more polluted than the outside air. Experts say that in these places there is a strong concentration of highly polluting elements, which may be the cause of allergies and asthma, among other more serious conditions.
Root thickness growth can be called secondary growth to distinguish it from extension growth. Generally speaking, during secondary growth meristematic cell cylinders develop which allow the emergence of new root tissues. The two meristematic tissues involved in secondary root growth are the vascular cambium, which allows the central cylinder to grow, and the suberogen or felogen cambium, which allows the periderm (bark) to grow.
Understanding the anatomy and physiology of plants depends fundamentally on knowledge of the organization and functioning of their cells. Plant cell cells have at least two characteristics that allow them to be clearly distinguished from animal cells: they have a rigid outer shell, the cell wall, and a cytoplasmic organule responsible for photosynthesis, the plastid.
All types of cells that make up a plant originated from meristematic tissues, formed by cells that have a thin primary wall, small vacuoles, and a large capacity for mitosis. Differentiated tissue cells, even though they did not die during differentiation (such as super, xylem, for example), lose their ability to multiply by mitosis.
Several stages of plant development occur at certain times of the year. The flowering season, for example, is characteristic for each species: it is common to hear that such a plant blooms in August, another in September, and so on. How do plants know when to bloom?
In many angiosperm species, especially those adapted to temperate regions, the leaves fall in the fall and are reborn in the spring. Plants that lose their leaves in a certain season are called deciduous or deciduous. Plants that do not lose their leaves are called perennials. Falling leaves in the fall is interpreted as an adaptation to intense cold and snow.
Reduction of lions, wolves or cougars causes imbalance in the ecosystem. Predator shortage leads to overcrowding of herbivores. The progressive disappearance of large carnivores, such as lions, wolves or cougars, threatens the planet's ecosystems, warned an international team of scientists who called for the protection of these predators.
Patient had rare disease that caused skull to become 5 cm thick. Surgery was performed at the University Medical Center of Utrecht, the Netherlands. A Dutch hospital successfully obtained a patient's first upper skull replacement surgery for a plastic prosthesis created in 3D printing.
England's zoo project injects fluorescent compound into endangered species for tracking. Scientists at Chester Zoo in Britain have devised a way to track down a rare and endangered amphibian by injecting a fluorescent compound into the creature. The species chosen is a small frog from the island of Madagascar in the Indian Ocean, the Mantella aurantiaca.
Scientists have observed elephant reactions to stressful situations. Animals are able to calm each other down, according to study. Asian elephants are able to comfort and soothe each other with physical contact and vocalizations in times of distress, according to the findings of a study published February 18, 2014 by PeerJ magazine.
New report was released this Thursday (June 5, 2014), World Environment Day. Warmer waters in the Indian and Caribbean are killing coral reefs. Global warming is causing trillions of dollars in damage to coral reefs, exacerbating risks to small tropical island countries threatened by rising sea levels, according to a UN report released Thursday (June 5, 2014). .
In addition to the sun, they also use the earth's magnetic field as a reference. Butterflies fly every year from the USA to Mexico's mountains. US monarch butterflies use the sun and the earth's magnetic field as navigation tools for their famous long-distance migration. Flapping its delicate orange and black wings, the insect travels thousands of miles each year from the United States and southern Canada to the Michoacan Mountains in central Mexico where they spend the winter.
This is the longest hatching period ever recorded in every animal kingdom. Phenomenon was recorded at 1400 meters deep by submarine. Octopus are seen hatching eggs in the rock wall off the coast of California, 1,397 meters deep. If one were to create an award for "mother of the year" in the animal kingdom, a strong contender would be a dedicated eight-armed mom who lives in the deep, dark, cold Pacific Ocean.
Marsupial is a symbol of the country and relies on dense trees for shelter. A 3-year survey tracked 40 satellite koalas in New South Wales. The koala, a marsupial that is one of Australia's symbols, could disappear as temperatures rise in the country unless "urgent" action is taken, one warned. study published this Thursday (3).
Conclusion is the largest mapping ever made of the family tree of birds. The complete genomes of 48 bird species were decoded. Birds use essentially the same singing genes that we humans use to speak. And flamingos are closer to pigeons than to pelicans. These are some startling revelations that emerged from the largest and most sophisticated mapping ever made of the bird family tree.
Hungarian Alberto Vásquez was inspired by the lack of water faced by communities in Colombia; The project has already won two international awards and is now seeking investors. Amid the water crisis, one of the main recommendations is to reuse water to reduce daily consumption. But doing so is not exactly easy or practical, at least when it comes to one of the most water-demanding daily habits: bathing.
Insects even have character traits like bravery and shyness - which may explain their incredible adaptability and survival. If you're one of those who steps on a cockroach and thinks you're crushing a simple-minded critter with limited cognitive abilities, then a recent study. can make your conscience a little heavier.
Instructor found rowing fish carcass while diving. Creature is known to inhabit very deep water. A marine science instructor was startled when she caught sight of a paddle fish (also known as regaleco) over 5 feet in length at sea in Los Angeles, California.
Chimpanzee and orangutan hands evolved more than human hands. Primate fingers have increased compared to thumb size. A fist to defend yourself, a thumb and tweezers to perform minute tasks: man's hand looks sophisticated, but it would be less "evolved" than chimpanzees - that's what a study published on Feb. 14 says. July 2015 in the magazine "Nature Communications".