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Yogita Ingle 5 years, 7 months ago
Effect on Flora: Acid rain is particularly harmful to trees and other plants. Acid rain adds aluminum to the soil and destroys important nutrients. As a result, trees and plants are less able to absorb the ground water they need for growth. Additionally, acid rain generally damages plant health, making them less resistant to insect damage and disease. Acidic water similarly affects aquatic plant life, destroying important food sources.
Effects on Microorganisms: In addition to the direct effects on fish, acid water also destroys ecosystems by killing organisms lower on the food chain. For example, the Pennsylvania Department of Environmental Protection found that mayflies are particularly vulnerable to acidic water, because it lowers sodium in the blood. Consequently, species feeding on mayflies will leave an affected area or starve.
Effects on fishes: Harmful effects become noticeable when the pH of water falls below 5.0 or rise above 9.6. Ill effects due to acidification are more pronounced in saltwater fish due to their adaptation to a higher pH. When pH is below optimal levels, fish become susceptible to fungal infections and other physical damage ¹⁶. As the pH of water falls, the solubility of calcium carbonate is reduced, inhibiting shell growth in aquatic organisms ¹⁶. In general, fish reproduction is affected at pH levels below 5.0 and many species (such as saltwater fish or sensitive freshwater fish like smallmouth bass) will leave the area ²¹. Fish begin to die when pH falls below 4.0 ¹².
Posted by Shujaat Zakir 5 years, 7 months ago
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Yogita Ingle 5 years, 7 months ago
The blood platelets are required for the process of blood clotting. Whenever there is an injury, to prevent the loss of blood it is necessary to form a clot. The vitamin K, clotting factors, calcium ions and the platelets are necessary agents for the formation of a blood clot. If there are no platelets, there will be no clot formation. This might result in haemorrhage in which there is continuous blood loss.
Posted by Xyz Abc 5 years, 7 months ago
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Yogita Ingle 5 years, 7 months ago
- A pair of Ovaries
- One on each side of uterus
- Produce female *** cell (ovum/ova)
- Secrete female hormones estrogen & progesterone
- Fallopian tube
- Exist in pairs , originating from uterus extending up to each ovary
- Receives ovum from ovary
- Uterus
- Pear-shaped muscular hollow structure
- Foetus develops here
- Cervix
- Narrow lower part of uterus
- ******
- Tube like structure
- Sperm discharge occurs here
- Acts as birth canal
Posted by Anushka ???? 5 years, 7 months ago
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Meghna Thapar 5 years, 6 months ago
The human male reproductive system consists of:
- Testes - Are the primary reproductive organs in males which are in pair. These are oval shaped organs which lie outside the abdominal cavity. It makes the male *** cells called sperms and produces male *** hormones called testosterone. The testes are situated in the scrotal sac outside the main body cavity because the formation of sperms requires a lower temperature than the normal body temperature.
- ******* - Is a muscular pouch which houses the testes. It is present outside the abdominal cavity and maintains a lower temperature than the normal body temperature.
- Epididymis - The sperms formed in the testes goes into a coiled tube called epididymis which stores the sperms temporarily.
- Vas Deferens (sperm duct) - It is a long tube which carries the sperms from epididymis to another tube called urethra.
- Seminal vesicles and prostrate gland - Both these glands are present along the path of vas deferens and add their secretions to sperms which allows them to transport easily.
- ***** - It is an organ which passés the sperms from the man's body into the ****** in the women's body during mating.
The secretions of seminal vesicles and prostrate gland provide nutrition to the sperms and also make their transportation easier by secreting a thick liquid.
Posted by Adarsh Kumar 5 years, 7 months ago
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Posted by Sangamithra Sg 5 years, 7 months ago
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Meghna Thapar 5 years, 6 months ago
Blood is a red coloured liquid which circulates in our body. It is red because it contains a pigment called haemoglobin in its red cells.
The main components of blood are:
(i) Plasma: It carries all the dissolved substances such as proteins, digested food, common salt etc from one part to another part of the body.
(ii) Red blood corpuscles (RBC): It carries oxygen from the lungs to all the cells of the body.
(iii) White blood corpuscles (WBC): It fights infection and protects us from diseases.
(iv) Platelets: It helps in the coagulation of blood in a cut or wound.
Lymph is a light yellow liquid. It is a medium of circulation in human body which flows only in one direction - from body tissues to the heart.
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Sandli Thakur✍?✍?(Helping Hand)? 5 years, 7 months ago
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Yogita Ingle 5 years, 7 months ago
Bisexual: In some animals like tapeworm, liver fluke, earthworm, leech, etc., the male and female reproductive organs are found in a single individual. Such organisms are called bisexual (hermaphrodite).
Examples: (Hibiscus, mustard) when it contains both stamens and carpels.
Posted by Nitin Patil 5 years, 7 months ago
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Yogita Ingle 5 years, 7 months ago
Gypsum is the crystalline mineral of hydrated calcium sulphate, CaSO4. 2H2O. It occurs in bulk form as alabaster, in fibrous form as satin spar, and as clear colorless crystals of selenite. It is used in making plaster of Paris, plaster and plaster board, and is an important constituent of Portland cement.
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Helper . 5 years, 7 months ago
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Yogita Ingle 5 years, 7 months ago
Uses of Electromagnets
- Generators, motors, and transformers
- Electric buzzers and bells
- Headphones and loudspeakers
- Relays and valves
- Data storage devices like VCRs, tape recorders, hard discs, etc.
- Induction cooker
- Magnetic locks
- MRI machines
- Particle accelerators
- Mass spectrometers
Posted by Smita Mahajan 5 years, 7 months ago
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Yogita Ingle 5 years, 7 months ago
Because the elements in the modern periodic table are arranged according to their electronic configuration. The basic structure is supported by the three main topics viz. electronic configuration, atomic number and chemical properties. The electronic configuration supports the arrangement of elements distributed in 18 groups and 7 periods.
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Meghna Thapar 5 years, 7 months ago
According to Ohm’s law, the current (I) flowing through a conductor is directly proportional to the potential difference (V) across its ends, provided its physical conditions remain the same.
V µ I
V/I = Constant
V/I = R
V = IR
where R is a constant of proportionality called resistance of the conductor.
Resistance is the property of a conductor to resist the flow of charges through it.
The S.I. unit of resistance is ohm (Ω).
From
R = V/I, 1 ohm = 1 volt/ampere
The property of the conduct due to which it opposes the flow of current through it is called as resistance of conductor.
The current through a resistor is inversely proportional to its resistance. If the resistance is doubled the current gets halved. A component used to regulate current without changing the voltage source is called variable resistance. In an electric circuit, a device called rheostat is often used to change the resistance in the circuit. A conductor having some appreciable resistance is called a resistor. A component of identical size that offers a higher resistance is a poor conductor. An insulator of the same size offers even higher resistance.
Posted by Aditi Bhagat 5 years, 7 months ago
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Meghna Thapar 5 years, 7 months ago
The rate at which electric energy is dissipated or consumed in an electric circuit is called electric power. It's SI unit is Watt (W). power = work done / time taken. we know that work done by current I when it flows for time T under potential difference V is given by : W = V*I*T joules.
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