In large amounts, the soil supplies nitrogen, phosphorus, potassium, calcium, magnesium, and sulfur; these are often called the macronutrients. In small amounts, the soil supplies iron, manganese, boron, molybdenum, copper, zinc, chlorine, and cobalt and are called micronutrients.
Air enters the respiratory systems of insects through a series of external openings called spiracles. These external openings, which act as muscular valves in some insects, lead to the internal respiratory system, a densely networked array of tubes called tracheae.
Q3. Which of the following elements has the lowest melting point?
The bark of white willow contains salicin, which is a chemical similar to aspirin . In combination with the herb’s powerful anti-inflammatory plant compounds (flavonoids), salicin is thought to be responsible for the pain-relieving and anti-inflammatory effects of the herb.
Citrus fruits contain the highest levels of citric acid, as well as ascorbic acid and vitamin C. These fruits have a sharp flavor and can be tart. Citrus fruits include grapefruit, oranges, lemons, limes, tangelos, clementines, kumquat, and ugli fruit.
Q7. Musa paradisiaca is the scientific name of which plant?
Some roots, called adventitious roots, arise from an organ other than the root—usually a stem, sometimes a leaf. They are especially numerous on underground stems. The formation of adventitious roots makes it possible to vegetatively propagate many plants from stem or leaf cuttings.
Spiders belong to a group of animals called “arachnids”. Scorpions, mites, and ticks are also part of the arachnid family. Arachnids are creatures with two body segments, eight legs, no wings or antennae and are not able to chew.
Q12. Which of the following elements has the lowest melting point?