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Anush Gupta 5 years, 1 month ago
Yogita Ingle 5 years, 1 month ago
At every trophic level a large amount of energy is lost in form of heat for maintaining metabolic activities and lost as heat. The amount of heat lost is generally 90 percent and the amount of energy retained is available from the previous trophic level to the next. The decline in energy level leads to :
i Lesser number of organisms in each trophic level.
ii Limited number of trophic level in food chains
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Yogita Ingle 5 years, 1 month ago
Maxwell’s right-hand thumb rule indicates the direction of magnetic field if the direction of current is known.
Thumb rules state that if thumb of the right hand points along direction of current, then the remaining curled , fingers of same hand gives the direction of the magnetic field due to the current.
Posted by Ande Karthik 5 years, 1 month ago
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Yogita Ingle 5 years, 1 month ago
The modern Periodic law can be stated as: “The physical and chemical properties of the elements are periodic functions of their atomic numbers”. The atomic number is equal to the number of electrons or protons in a neutral atom.
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Yogita Ingle 5 years, 1 month ago
Mendeleev divided his periodic table in eight groups and seven periods. Groups from I to VII are meant for normal elements and group VIII is for transition elements.
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Yogita Ingle 5 years, 1 month ago
Reactivity of some metals are given in descending order
K > Na > Ca > Mg > Al > Zn > Fe > Pb > Cu
Nischal Shetty 5 years, 1 month ago
Posted by Ritik Kumar 5 years, 1 month ago
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Meghna Thapar 4 years, 11 months ago
MgCl2 is an ionic compound because this compound is formed by the transfer of electrons between magnesium atom and chlorine atoms. Magnesium atom loses two electrons to form magnesium cation whereas each chlorine atom accepts one electron to form chloride ion (anion). Magnesium (Atomic number = 12) has electronic configuration 2, 8, 2. It loses 2 electrons to complete octet configuration in its valence shell. Chlorine (Atomic number = 17) has electronic configuration 2, 8, 7.
Posted by King?Adithya H. M.. 5 years, 1 month ago
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Yogita Ingle 5 years, 1 month ago
If the atomic number is given from the electronic configuration we can find the poasition of the element.
Example:Carbon (6)
Electronic configuration: (2,4)
No. of valence electrons gives the group number and no of shells gives period.
So it corrosponds to group 4 and period 2.
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Vishal Verma 5 years, 1 month ago
Yogita Ingle 5 years, 1 month ago
Elimination of toxic and waste products from the body is called excretion. Organisms like animals have an advanced and specialized system for excretion. But plants lack a well-developed excretory system like that in animals. They do not have special organs for excretion. Thus, excretion in plants is not so complex.
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Posted by King?Adithya H. M.. 5 years, 1 month ago
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Yogita Ingle 5 years, 1 month ago
Transportation in animals is the combined effort of the circulatory system, and the excretory system.
- Blood is the fluid that flows in the blood vessels and transports the digested food from the small intestine to various parts of the body.
- There are two types of blood vessels- arteries and veins. The arteries carry oxygen-rich blood from the heart to different parts of the body and the oxygen-deficit blood is transported through the veins from all parts of the body to the heart.
- The heart is the main organ that pumps blood throughout the body.
- The process of removal of waste out of the cells is called excretion.
- The nitrogenous waste, excess sugar in the blood, excess salts, undigested wastes, and carbon dioxide are the substances to be excreted from the body.
- The lower organisms like amoeba, hydra, paramecium excrete the nitrogenous waste by the process of diffusion through the cell membrane, as they lack special excretory organs.
- The human excretory system constitutes kidneys, ureter, urinary bladder, urethra.
- Kidneys are the main excretory organ which regulates the balance of water and minerals in the body. They absorb minerals in the blood and eliminate the nitrogenous waste from the blood in the form of urine.
It is an important process to circulate water, essential nutrients, gases, and excretory products within the plant for various purposes. The vascular tissues are responsible for transportation in plants. The suction force helps in the transportation of water and minerals in the plant.
- Xylem is a vascular tissue involved in the conduction of water from root hairs to the rest of the plant parts.
- The transportation in the phloem is bidirectional. The food molecules are transported to the necessary regions with the help of phloem.
- The root hairs absorb water and minerals from the soil and store it in vacuoles. This water is absorbed by the plants by the suction force.
- The excess water in the plants is lost in the form of water vapour through the stomata in the leaves. This process is known as transpiration.
- The prepared food substances are translocated to different organs of the plant through the phloem. The excess food is stored in the storage organs of the plant.
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Yogita Ingle 5 years, 1 month ago
Law of Dominance: This is also called Mendel’s first law of inheritance. According to the law of dominance, hybrid offsprings will only inherit the dominant trait in the phenotype. The alleles that are suppressed are called as the recessive traits while the alleles that determine the trait are known as the dormant traits.
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