Why do TSH levels in pregnant women need to be monitored?
Thyroid hormone has an important role in brain development of the baby during pregnancy. It is clear that overt hypothyroidism... View Article
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State the main function of TSH.
TSH stands for thyroid stimulating hormone. A TSH test is a blood test that measures this hormone. The thyroid is... View Article
Give the full form of TSH.
Thyroid-stimulating hormone (TSH) Explanation The thyroid hormones are secreted by the thyroid gland, which is located in front of the neck.... View Article
List two advantages of solar cells.
Solar cells create savings in electricity. It is a renewable source of energy. It is an environmentally friendly energy. No... View Article
The future of power generation by solar energy is bright in India. Give reason.
Our country has become increasingly dependent on fossil fuels such as coal, oil, and gas due to the growing consumption... View Article
How much voltage can be developed and how much electricity can be produced by one typical solar cell when exposed to the Sun?
One typical solar cell,when exposed to the sun can produce a voltage of approximately 0.5 to 0.6 volts and the... View Article
State the Periodic Law on which the Modern Periodic Table is based.
In 1869, Dmitri Mendeleev and Lothar Meyer established the periodic law independently. The first periodic table was developed by Mendeleev... View Article
State the common characteristic of the following elements: Boron, Silicon, Germanium and Arsenic
The common characteristic of the following elements is that they have the properties of metals and non-metals. Hence, are known... View Article
Covalent compounds are generally poor conductors of electricity. Why?
Covalent compounds are formed on the basis of sharing electrons. When the electrons are shared within the bonds, there is... View Article
What is a fuse? Why is it called a safety device?
A fuse is a piece of wire of a material with a very low melting point, that is, it melts... View Article
List three characteristic features of the electric current used in our homes.
Three characteristic features of the electric current used in our homes are: Appliances to be connected in parallel. Each of... View Article
Two identical resistors, each of resistance 15 Ω, are connected in (i) series, and (ii) parallel, in turn to a battery of 6 V. Calculate the ratio of the power consumed in the combination of resistors in each case.
Resistance, R1 = R2 = 15Ω Voltage, V = 6V. To find: The ratio of power consumed in the combination of resistors in... View Article
Draw a schematic diagram of a circuit consisting of a battery of 3 cells of 2 V each, a combination of three resistors of 10 Ω, 20 Ω and 30Ω connected in parallel, a plug key and an ammeter, all connected in series. Use this circuit to find the value of the following: (a) Current through each resistor (b) Total current in the circuit (c) Total effective resistance of the circuit
Resistance, R1=10Ω Resistance, R2=20Ω Resistance, R3=30Ω Number of cells =3 Voltage of each cell =2 V Total volatgeof the battery, V =... View Article
State how sperms move towards the female germ cell.
Sperms move actively in the female genital tract by swimming. The presence of the tail in the sperm help it... View Article
Why are testes located outside the abdominal cavity?
Human testes are the male reproductive gland. It produces sperm and male reproductive hormones which are androgens and testosterone. There... View Article
Describe in brief the functions of the following parts in the human male reproductive system: (i) Testes (ii) Seminal vesicle (iii) Vas deferens (iv) Urethra
Role of human male reproductive system is as follows: (i) Testis: These are the main reproductive part in male reproductive... View Article
What is puberty?
Puberty is defined as the phase where a child’s physical and sexual characteristics start to mature.Puberty begins when the brain... View Article
Draw a neat diagram showing fertilisation in a flower and label (a) Pollen tube, (b) Male germ cell and (c) Female germ cell, on it. Explain the process of fertilisation in a flower. What happens to the (i) ovary and (ii) ovule after fertilisation?
In flowers, the pollen grain germinates after the pollination of the carpel and grows into the style by creating the... View Article
Why is nutrition necessary for the human body?
Nutrition is required for the human body to obtain energy for performing daily activities and proper maintenance of body functions. ... View Article
Name two metals which are the best conductors of heat.
Silver and Copper are the best conductors of heat. Explanation Most conducting materials used for practical applications are metals.This is... View Article
