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Invertebrates
Invertebrates are animals that lack a spinal cord, such as insects. Ask questions here about these organisms that make up 95 percent of all animal life.
1,408 Questions
What is the main form of nutrition for diatoms?
The main form of nutrition for diatoms is photosynthesis, where they use sunlight to convert carbon dioxide and nutrients into organic matter. Diatoms are autotrophic organisms, meaning they can produce their own food using light energy.
How many eggs does one mayfly lay?
A female mayfly typically lays between 400 to 3,000 eggs in a single reproductive event, which takes place in a matter of hours before she dies.
Yes, protozoans are invertebrates because they do not possess a backbone or spinal column. They are single-celled organisms that belong to the kingdom Protista.
What are 4 Substances that pass out of the frogs body through the cloaca and vent?
- Urine: Waste from the kidneys is excreted through the cloaca and vent as urine.
- Feces: Undigested food and waste from the digestive system are passed out through the cloaca and vent as feces.
- Mucus: Frogs secrete mucus through their skin, which can also be expelled through the cloaca and vent.
- Reproductive products: Eggs and sperm are released through the cloaca and vent during mating and reproduction.
Compare the circulatory system of each of the three major classes of mollusks?
In cephalopods like octopuses, the circulatory system is closed, with blood contained in vessels. Bivalves like clams have an open circulatory system where blood is pumped into a hemocoel. Gastropods, such as snails, have a mix of closed and open circulatory systems, with a heart that pumps blood through vessels but also into spaces around organs.
What group of invertebrates has a mantle?
Mollusks have a mantle, which is a protective layer of tissue that covers their soft body. The mantle plays a role in shell formation and can also secrete mucus for locomotion or defense.
How do invertebrates remove wastes that are produced by cells in their bodies?
Invertebrates eliminate waste through structures such as nephridia or Malpighian tubules that filter waste from the blood and release it outside the body. Some invertebrates excrete waste through diffusion across their body surface or gills.
No, cnidarians do not have spicules. Spicules are small, needle-like structures made of calcium carbonate or silica that are found in some sponges and echinoderms for support and defense. Cnidarians, such as jellyfish and corals, have a different type of support structure called a mesoglea.
Is cnidarians asexual or sexual?
yes
Marine bivalves reproduce by releasing prodigious numbers of eggs and sperm into the water, where external fertilization occurs. The fertilized eggs then float in the surface Within 48 hours after fertilization, the embryo develops into a minute, planktonic, trochophore larvae. This stage is followed by another larval form, the veliger, which settles to the seabed and transforms into an adult. In freshwater bivalves, the eggs are retained in the gill chambers of the female, where they undergo fertilization and develop into a peculiar larval form, the glochidium. Upon its release, the larva attaches to passing fish, and lives as an ectoparasite for several weeks before settling.
From: http://science.jrank.org/pages/944/Bivalves.html
What is respiration of Paramecium?
Paramecium utilizes a process called diffusion to respire. Oxygen enters through the cell membrane, while waste products like carbon dioxide exit the cell through the same process. This allows Paramecium to exchange gases with its environment and maintain its metabolic functions.
What kind of houses do diatoms make?
Diatoms make silica shells called frustules. These frustules form intricate designs and patterns, which are unique to each species of diatom. The frustules function as protective outer coverings for the diatoms.
i did research on these a while back In general diatoms can be used to trace a variety of environmental phenomena, from changes in sea level, (whether brought about by climate change or tectonic activity), breaches of coastal barriers, (as a result of storms and/or sea-level rise), to the evaporation of lakes, (increasing salinity determining diatom assemblages). Below is an outline of their most prevalent uses. # Marine
Some species are restricted to a very narrow range of salinities and are know as stenohaline species, others have no such restrictions and are known as cosmopolitan species. As a result, this causes zonation, which is particularly evident in estuaries, where a spectrum (and a gradient for such a spectrum) can be calculated from coastal to offshore species. This has applications in determining palaeo-fluvial environments, and sediment focusing. # Freshwater.
Some freshwater species will tolerate a little salt, and are known as halophilic, occurring in coastal lakes, or where the groundwater is rich in salts. However most freshwater species are stenohaline and will not tolerate salt. There are several ways of deducing palaeotrophic status using diatoms: # Total Diatom Count - This is relatively simple, the more diatoms there are in your sample, the more productive a given body of water is. # Centric:Pennate Ratio - The more centrics there are in your sample, the more productive the environment is. (With the exception of a species called Cyclotella.) # Indicator Species - Certain species are typical of certain conditions, for example Stephanodiscus is typical of eutrophic (abundant nutrient) conditions, and Tabellaria of oligotrophic (very low nutrient) conditions. # Planktonic:Non-planktonic Ratio - Planktonic forms are more common in eutrophic lakes. # Diversity Indicators - A low overall diversity amongst diatoms indicates stressful conditions, for example extreme trophic status (hyper-oligotrophic or hyper-eutrophic). However this could also indicate a source of pollution etc. This perhaps the most important and most widely used application of diatom studies. Diatoms are highly sensitive to pH and can illustrate differences of as little as 0.1 pH units. To accomplish this species are classified as either: * Acidobiontic (Acid Living) pH < 7 * Acidophilous (Acid Preferring) pH ≤ 7 * Circumneutral pH = 7 * Alkaliphilous (Alkali Preferring) pH ≥ 7 * Alkalibiontic(Alkali Living) pH > 7 This method is highly dependant upon knowing the pH preference for all of the diatoms present, as the percentage of each of the above groups is measured and the ratios used to calculate a log index of the given population. With the use of some complicated mathematics this, in turn, can then be used to determine the palaeo-pH. Obviously, it is not always possible to know the preference of all of the species in your sample, and therefore this method can not always be applied. Diatoms are not very useful in determining changes in palaeo-temperature, due to the fact that the large majority of species will tolerate very wide ranges of temperature, typically from 0oC to 20oC. That said, different assemblages arepresent when comparing warm and cold waters. However, this is almost certainly due to other overriding factors such as: incident solar radiation, water chemistry, pH, and nutrient availability.
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Structures such as flat shape bristles or spines increase the surface area of diatoms, providing more buoyancy and preventing them from sinking. This increased surface area allows them to capture more light for photosynthesis, helping them stay afloat in the upper, sunlit regions of the water column. Additionally, these structures also reduce drag, allowing diatoms to maintain their position in the photosynthetic zone.
Is a free swimming form of a cnidarian called a polyp?
No, a free swimming form of a cnidarian is called a medusa. Polyps are typically attached to a substrate and have a cylindrical body with a mouth surrounded by tentacles at one end. Medusae have a bell-shaped body with tentacles hanging down.
No, diatoms are not parasitic. They are single-celled algae that are primarily photosynthetic, meaning they make their own food using sunlight. They play an important role in marine and freshwater ecosystems as primary producers.
What are some animals that are in the cnidarian group of invertebrates?
Some animals that are found in the phylum Cnidaria are corals, sea anemones, and jellyfish. Cnidarians are characterized by the presence of cnidocytes, or specialized stinging cells, with which the invertebrates can capture their prey. They are radially symmetrical and have two cell layers. All cnidarians are aquatic, and the majority are also marine.
What nutrition cnidarians have?
Cnidarians do not have a centralized digestive system like other animals. They capture small prey using tentacles armed with stinging cells called cnidocytes. Once caught, the prey is pushed into a central cavity where digestion occurs. The nutrients are then absorbed through the body wall.
The tiny exoskeleton of a diatom is mostly composed of?
The tiny exoskeleton of a diatom is mostly composed of silica, which is a form of silicon dioxide. This silica shell gives diatoms their characteristic glass-like appearance and provides protection for the cell inside.
No, diatoms are not found in glass. Diatoms are actually microscopic algae that are encased in a cell wall made of silica. Glass, on the other hand, is produced through melting sand and other materials at high temperatures to create a transparent, solid material.
What's the difference between a pennate and a centric diatom?
Pennate diatoms have elongated, bilaterally symmetrical cells with a slit-like opening, while centric diatoms are circular or oval in shape with radial symmetry. Pennate diatoms are typically found in benthic habitats, while centric diatoms are more common in planktonic environments.
What are different animals in the sponge group?
Animals in the sponge group, known as phylum Porifera, include various species of sponges such as sea sponges, glass sponges, and demosponges. These animals are multicellular but lack true tissues and organs, with specialized cells performing different functions within their bodies. Sponges are filter feeders that live in aquatic environments, ranging from freshwater to marine habitats.
What protist is common in natural streams and other bodies of water near wild animal habitats?
Giardia is a common protist found in natural streams and bodies of water near wild animal habitats. It can be spread through contaminated water sources and can cause gastrointestinal illness in humans and animals if ingested.
What ocean zone do diatoms live in?
Diatoms are primarily found in the sunlit zone of the ocean, also known as the euphotic zone. This zone receives enough sunlight for photosynthesis to occur, which is essential for diatoms as they are photosynthetic organisms. They are most abundant in surface waters where sunlight penetration is optimal.
Why are the invertebrates so successful in the ocean?
Invertebrates are successful in the ocean because of their wide diversity of body forms and strategies that have evolved over millions of years. This diversity allows them to occupy a wide range of ecological niches and adapt to different environmental conditions, making them resilient and able to thrive in various marine habitats. Additionally, their reproductive efficiency, high population numbers and ability to quickly colonize new habitats contribute to their success in the ocean.
