pre choice questions and carry 1 mark each.
Q.1) Name the pigment essential for photosynthesis,
Q.2) Define the S.I unit of current.
0:3) Ferrous sulphate decomposes with the evolution of a gas having a characteristic odour of bu
sulphur. Write the chemical reaction involved and identify the type of reaction.
Q.4) Detine reactants ? On which side of chemical equation reactants are written?
25) Write one equation for decomposition reaction where energy is supplied in the form of light.
Q.6) Draw a flow chart to show the breakdown of glucose by various pathways.
0.7) Explain the three factors on which the resistance of a conductor depends ?
0.8) Ștate one word for the following:
cal Mechanism for moving the air in and out of body.
5Structure in plants to facilitate gaseous exchange.
C) Respiratory organ in aquatic organism.
29) A solution of a substance 'X' is used for white washing.
iy Name the substance 'X'and write its formula.
ii) Write the reaction of substance 'X' with water.
ni) What type of reaction is this?
2.11 What does an electric circuit mean?
jj) Why are coils of electric toasters and electric irons made of an alloy rather than a pure
-11) 1) Give the steps involved in photosynthesis.
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Answers
Answer:
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Answer:
Explanation:
- Pigments for Photosynthesis. Photosynthesis in plants is dependent upon capturing light energy in the pigment chlorophyll, and in particular chlorophyll a. This chlorophyll resides mostly in the chloroplasts and gives leaves their green color.
- The SI unit of current is ampere.
- Ferrous sulphate decomposes with the evolution of a gas having a characteristic odour of burning sulphur. What is the chemical reaction involved, and what is the type of reaction? So the smell is due to SO2/SO3. Since FeSO4 splits to form three different product, this reaction is a decomposition reaction
- Reactants are the starting materials in a chemical reaction. Reactants undergo a chemical change in which chemical bonds are broken and new ones formed to make products. In a chemical equation, reactants are listed on the left side of the arrow, while products are on the right side.It is the convention to place the reactants on the left side of a chemical equation and the products on the right side. The arrow between the reactants and products should point from left to right or if the reaction is proceeding both ways, point in both directions.
- Decomposition reaction requiring heat is known as thermal decomposition , CaCO3--------->CaO + CO2. Decomposition reaction requiring light is known as photo chemical decomposition reaction , 2AgCl-------2Ag + Cl2
6.
7.Physical parameter : it's include length, area , bonding between the electron pair and type of material used.
Resistance of a conductor is directly proportional with its resistivity.
Resistance of a conductor is directly proportional with the length of conductor.
8.breathing
9.Gas Exchange in Plants. Plants obtain the gases they need through their leaves. They require oxygen for respiration and carbon dioxide for photosynthesis. The gases diffuse into the intercellular spaces of the leaf through pores, which are normally on the underside of the leaf - stomata
10.A majority of aquatic animals like fish and prawns breathe through special organs called gills.
11.(i)The substance ‘X’ which is used in white washing is calcium oxide or quick lime and its formula is CaO.
(i)The reaction involved is
12.An electric circuit is a path in which electrons from a voltage or current source flow. The point where those electrons enter an electrical circuit is called the "source" of electrons. The point where the electrons leave an electrical circuit is called the "return" or "earth ground". Coils of electric toasters and electric irons made of an alloy rather than a pure metal because the resistivity of an alloy is higher than the pure metal. Also at high temperatures, the alloys do not melt easily.
13.Photosynthesis is done by the chloroplasts of the plant cells. What happens is that the inorganic molecules (molecules that do not contain both hydrogen and carbon atoms) is converted into organic (molecules that contain both hydrogen and carbon atoms). But there needs to be light/solar energy (from the Sun) in order for this to happen.
In this case, the water and carbon dioxide (which are inorganic molecules) are converted into glucose (a type of carbohydrate, or a simple sugar). Oxygen is just readily present in the environment.
The actual chemical formula for photosynthesis is:
6
C
O
2
+
6
H
2
O
→
C
6
H
12
O
6
+
6
O
2
The
→
signifies the light energy required for photosynthesis to occur
