Suggest some approaches towards the conservation of forests.
Forest conservation approaches have been given:- In- Situ conservation approach have been given for the forest conservation in natural or artificial habitat under human control like National parks, Zoological parks, Botanical gardens, Wildlife Sanctuaries, Biosphere Reserves etc. Several national conservation programs are united with the international programs like UNESCO (United Nations Educational, Scientific and Cultural Organisation) and IUCN (International Union of Conservation of Nature and Natural Resources). In- Situ conservation is the appropriate method for the maintenance of plants and animals in their natural habitat or under the protected areas.
National park is the land reserved area and is maintained by the national government for the welfare of entire wildlife. Plantation, cultivation, grazing are not allowed. Total 103 national parks are present in India. India’s first national park was Jim Corbett National park made in 1936.
Wildlife sanctuary is an reserved area for animals only. Private ownership, minor forest products are allowed or provided that do not affect the animals. Total 548 wildlife sanctuaries are present in India.
Biosphere reserves are the specified area in which multiple use of land is permitted by dividing it into multiple zones, each zone is used for the particular activity like-
1. Core zone:- no human activity is allowed in this zone.
2. Buffer zone:- limited human activities are allowed in this zone.
3. Manipulation zone:- many human activities are allowed in this zone.
Biosphere reserves preserve wildlife population, genetic resources available of the plants and the animals.
Zoological parks or botanical garden have been made for preserving animals or plants respectively that are made for conservation of forest.
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.
Outline a project which aims to find the dominant coat colour in dogs.
Draw the structure for the following compounds.
(i) Ethanoic acid (ii) Bromopentane*
(iii) Butanone (iv) Hexanal.
*Are structural isomers possible for bromopentane?
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?
How is the sex of the child determined in human beings?
(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?
Calculate the number of electrons constituting one coulomb of charge.
What is an homologous series? Explain with an example.
Why is variation beneficial to the species but not necessarily for the individual?
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?
A copper wire has diameter 0.5 mm and resistivity of 1.6 × 10–8 Ω m. What will be the length of this wire to make its resistance 10 Ω? How much does the resistance change if the diameter is doubled?
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
What is ozone and how does it affect any ecosystem?
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
An object 5.0 cm in length is placed at a distance of 20 cm in front of a convex mirror of radius of curvature 30 cm. Find the position of the image, its nature and size.
What were the limitations of Döbereiner’s classification?
How are involuntary actions and reflex actions different from each other?
Balance the following chemical equations.
(a) HNO3 + Ca(OH)2 → Ca(NO3)2 + H2O
(b) NaOH + H2SO4 → Na2SO4 + H2O
(c) NaCl + AgNO3 → AgCl + NaNO3
(d) BaCl2 + H2SO4 → BaSO4 + HCl
State Fleming’s left-hand rule.
Give two important uses of washing soda and baking soda.