GSC101 Assignment
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*Question-1*
Phenomena | Physical Change / Chemical Change | Reason
|-|
Digestion of Food | Chemical Change | Reason: Digestion involves complex biochemical reactions that change the chemical composition of food molecules.
Formation of clouds | Physical Change | Reason: Cloud formation involves the condensation of water vapor into liquid water droplets without changing the chemical composition of water molecules.
Formation of curd from Milk | Chemical Change | Reason: Curd formation is a chemical change where lactose in milk is converted into lactic acid by bacterial action, altering the chemical composition.
*Question-2*
I. *Testing saturation of a solution:*
- The student would add a small amount of solute to the solution at the given temperature.
- If the added solute dissolves completely, the solution is unsaturated. If some solute remains undissolved, the solution is saturated.
II. *Cooling a hot saturated solution:*
- As the saturated solution cools, its solubility decreases.
- This causes excess solute to precipitate out of the solution, resulting in the formation of crystals.
*Question-3*
I. *Purpose and main function of the nucleus:*
- *Purpose of the nucleus having an envelope:* The nuclear envelope separates the nucleus from the cytoplasm, regulating the passage of materials into and out of the nucleus.
- *Main function of the nucleus:* It houses the genetic material (DNA), which controls cellular activities such as growth, metabolism, and reproduction.
II. *Components of transport system in highly organized plants with functions:*
- *Xylem:* Transports water and minerals from roots to shoots; provides mechanical support.
- *Phloem:* Transports organic nutrients (e.g., sugars) from sources (e.g., leaves) to sinks (e.g., roots); also involved in signaling and defense.
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