CBSE Class 6 Science Practice Worksheet Set 21

Assignment Worksheet (Based on Lesson 3: Fibre to Fabric)

Question 1. Study the pictures/diagrams shown below and answer the questions that follow:
(a) Which part of the cotton plant yields cotton fibres?
Answer: Cotton fibres are obtained from cotton bolls, which are the fruits of the cotton plant.
In simple words: Cotton comes from the fluffy fruit of the cotton plant called cotton bolls.

Exam Tip: Remember that cotton is a fruit fibre, not a stem or leaf fibre.

Question 1.(b) Identify the process shown in figure (b).
Answer: The process shown in figure (b) is ginning, where cotton seeds are separated from the fibres by combing.
In simple words: Ginning is the process of removing seeds from harvested cotton.

Exam Tip: Traditional ginning was done by hand, but nowadays machines are used.

Question 1.(c) What process is being carried out by the boll on the charkha? (Note: referring to the woman spinning on the charkha in figure c)
Answer: The process being carried out is spinning, where fibres are drawn out and twisted to form yarn.
In simple words: Spinning turns loose cotton fibres into strong yarn using a charkha.

Exam Tip: Spinning converts fibre into yarn, which is the next step before making fabric.

Question 1.(d) What is the man shown in the figure doing on the handloom? (Figure d)
Answer: The man is weaving yarn to make fabric or cloth on a handloom.
In simple words: Weaving is interlacing two sets of yarn to make cloth.

Exam Tip: Weaving uses two sets of yarn arranged perpendicular to each other.

Question 2. Follow the clues and solve the crossword puzzle.
Answer:
Across:
1. A simple machine that people used in their homes in the past for spinning fibres. It has a large wheel operated with hand or foot. -> Charkha
3. A process of separation of fibres from the stem using bacterial action and moisture on plants. -> Retting
7. The process of sorting out seeds from cotton fibres. -> Ginning
8. A machine used for weaving cloth. -> Loom

Down:
2. The process of interlacing two or various sets of threads to form a fabric or a cloth. -> Weaving
4. The process of converting a single thread or yarn into fine cloth or other fine craft. -> Knitting
5. A thin, pointed piece of wood used for spinning fibres into the thread by hand. -> Spindle (or Takli)
6. The fruit of the cotton plant that contains the seeds and the fibres. -> Cotton boll
In simple words: Crossword clues test key terms related to fibre processing like ginning, spinning, and weaving.

Exam Tip: Learn exact scientific terms like retting and ginning for fibre processing questions.

Question 3. Write down some useful products made from cotton to complete the wheel.
Answer:
1. Cotton clothes (shirts, trousers, sarees)
2. Bed sheets and pillow covers
3. Bandages and medical cotton
4. Curtains and tablecloths
In simple words: Cotton is widely used to make clothing, home furnishings, and medical supplies.

Exam Tip: Cotton absorbs sweat well, making it ideal for summer clothing and medical use.

Question 4. Classify the articles given in the box below into three groups - synthetic, animal sources and plant sources: cotton, terylene, silk, rayon, wool, polyester, flax, jute.
Answer:

In simple words: Fibres are grouped based on whether they are man-made (synthetic) or obtained from plants and animals (natural).

Exam Tip: Synthetic fibres are chemical-based (petrochemicals), whereas natural fibres come from living organisms.

Question 5. Study two groups of figures given below and answer the question that follows. Group A: sweater, shoe, fur coat. Group B: khadi shirt, jute rope, bandage. On what basis have these been grouped?
Answer: The items are grouped based on the source or type of material used to make them:
- Group A items are made from animal sources (wool, leather/fur).
- Group B items are made from plant sources (cotton, jute).
In simple words: Group A contains animal-derived products, while Group B contains plant-derived products.

Exam Tip: Always identify the constituent materials of an object to classify its source correctly.