How does the embryo get nourishment inside the mother’s body?
Embryo gets nourishment inside the mother’s body through the placenta. Placenta is an organ which forms in uterus during the pregnancy and is less than 1kg in weight. It helps to bring the foetus and the maternal blood close enough for the exchange of oxygen and nutrition and it also removes the waste product from the baby’s blood. And, it also has the umbilical cord (naval string) which is attached near the centre of placenta to the foetus.
Popular Questions of Class 10 Science
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When a 12 V battery is connected across an unknown resistor, there is a current of 2.5 mA in the circuit. Find the value of the resistance of the resistor.
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Outline a project which aims to find the dominant coat colour in dogs.
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Draw the structure for the following compounds.
(i) Ethanoic acid (ii) Bromopentane*
(iii) Butanone (iv) Hexanal.*Are structural isomers possible for bromopentane?
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A hot plate of an electric oven connected to a 220 V line has two resistance coils A and B, each of 24 Ω resistance, which may be used separately, in series, or in parallel. What are the currents in the three cases?
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How is the sex of the child determined in human beings?
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(a) What property do all elements in the same column of the Periodic Table as boron have in common?
(b) What property do all elements in the same column of the Periodic Table as fluorine have in common? - Q:-
Calculate the number of electrons constituting one coulomb of charge.
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What is an homologous series? Explain with an example.
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Why is variation beneficial to the species but not necessarily for the individual?
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A man with blood group A marries a woman with blood group O and their daughter has blood group O. Is this information enough to tell you which of the traits – blood group A or O – is dominant? Why or why not?
Recently Viewed Questions of Class 10 Science
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Give any two ways in which biodegradable substances would affect the environment.
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A milkman adds a very small amount of baking soda to fresh milk.
(a) Why does he shift the pH of the fresh milk from 6 to slightly alkaline?
(b) Why does this milk take a long time to set as curd? - Q:-
Compare and contrast nervous and hormonal mechanisms for control and coordination in animals.
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Two conducting wires of the same material and of equal lengths and equal diameters are first connected in series and then parallel in a circuit across the same potential difference. The ratio of heat produced in series and parallel combinations would be –
(a) 1:2 (b) 2:1 (c) 1:4 (d) 4:1
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Define the principal focus of a concave mirror.
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Write the balanced chemical equations for the following reactions.
(a) Calcium hydroxide + Carbon dioxide → Calcium carbonate + Water
(b) Zinc + Silver nitrate → Zinc nitrate + Silver
(c) Aluminium + Copper chloride → Aluminium chloride + Copper
(d) Barium chloride + Potassium sulphate → Barium sulphate + Potassium chloride - Q:-
Why does the colour of copper sulphate solution change when an iron nail is dipped in it?
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What would you observe when zinc is added to a solution of iron(II) sulphate? Write the chemical reaction that takes place.
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How is the sex of the child determined in human beings?
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We saw in this chapter that there are four main stakeholders when it comes to forests and wildlife. Which among these should have the authority to decide the management of forest produce? Why do you think so?
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