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The excretory system of human beings consists of the following main organs: two kidneys, two ureters, bladder and urethra. Kidneys are located in the abdomen, one on either side of the backbone. Urine produced in the kidneys passes through the ureters into the urinary bladder where it is stored until it is released through the urethra. The process of removal of toxic waste from the body of an organism is called excretion. The excretory unit of a kidney is called nephron. The excretory system removes the poisonous waste substances from the body in the form of urine and maintains ionic balance called osmoregulation.
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Gaurav Seth 5 years, 5 months ago
When the temperature of metallic conductor increases, the velocity of free electrons increases but it also cause increase in amplitude of vibration of metallic atoms which cause some extra resistance in the path of free electron. Hence resistance increases with increase in the temperature.
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Posted by Yash Jaiswal????? 5 years, 5 months ago
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Protoplasm is the living contents of a cell that is surrounded by a plasma membrane. It is a general term for the cytoplasm. Protoplasm is the complex, semifluid, translucent substance that constitutes the living matter of plant and animal cells. Protoplasm comprises of proteins, fats, and other molecules suspended in water. It includes both the contents of nucleoplasm and cytoplasm. Protoplasm contains the genetic material of a cell. It also controls the activity of the cell.
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Posted by Preety Th 5 years, 5 months ago
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Yogita Ingle 5 years, 5 months ago
Height of the object =2 cm
U(object distance) = -15 as u is always negative
F = -10 (as it is always negative for concave miror and lens )
1/F =1/v + 1/u
-1/10 = 1/v + (-1/15)
-1/10 +1/15 =v
-3+2/30 =v
V=-30cm
Hi/Ho = - V/U
Hi /2 = -(-30/15)
Hi =-30×2÷15
Hi =-4cm (Real and inverted)
Posted by Preety Th 5 years, 5 months ago
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Yogita Ingle 5 years, 5 months ago
The image formed in front of the concave mirror is real, so m is negative,
m = -3, u = -10 cm
As m = -v/u or -3 = -v/-10
v = -30 cm
By mirror formula,
1/f = 1/v + 1/u = 1/-30 + 1/-10 = -4/30
or f = -30/4 = -7.5 cm
Radius of curvature, R = 2f = 2 x (-7.5) = 15cm
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