CBSE Class 4 Science World Of Seeds Worksheet

Holiday Homework - Class IV Science

Explore the world of seeds

Step: 1
Take seeds of lady's finger, coriander, green gram and fenugreek (methi).
Step: 2
Sow the lady's finger and coriander seeds in a pot filled with soil.
Step: 3
Place the green gram and fenugreek seeds on moist cloth kept in a petri dish (small bowl).
Step: 4
Water it and keep in a place where maximum sunlight is available.

Step: 5. Observe the seeds and fill in the following table:
Answer:

In simple words: Seeds need water, air, and warmth to grow into tiny baby plants called seedlings.
Exam Tip: Always mention that moisture and warmth are essential for seed germination.

Your Lungs

Question 1. Where are your lungs located?
Answer: Your lungs are located inside your chest cavity, protected by the rib cage.
In simple words: Lungs are inside your chest, safely guarded by your ribs.

Exam Tip: Mention both chest cavity and rib cage for full marks.

Question 2. Complete the graphic organizer
Answer:
Type of air that your lungs remove from your blood cells: Carbon dioxide (bad air / waste gas).
Type of air that your lungs put into your blood cells: Oxygen (good air / essential gas).
In simple words: Lungs take out carbon dioxide and put in fresh oxygen.

Exam Tip: Clearly link carbon dioxide with removal and oxygen with supply.

Question 3. What is trachea?
Answer: The trachea, also known as the windpipe, is the air passage tube that connects your voice box to your lungs, dividing into two tubes leading to the left and right lung.
In simple words: The trachea is the windpipe that carries air from your throat down into your lungs.

Exam Tip: Use the alternate term 'windpipe' in your definition.

Question 4. What do lungs look like when they've been damaged from smoking?
Answer: When lungs are damaged by smoking, they appear grey in color or have black spots on them, unlike healthy lungs which are pinkish-grey and spongy.
In simple words: Damaged lungs turn grey or get black spots instead of looking pinkish-grey.

Exam Tip: Contrast healthy lungs (pinkish-grey) with damaged lungs (grey with black spots).

Question 5. Why does asthma make it hard for people to breathe?
Answer: Asthma makes it hard for people to breathe because it narrows the breathing tubes (airways), restricting the free flow of air in and out of the lungs.
In simple words: Asthma narrows the breathing tubes, making air passage very tight and difficult.

Exam Tip: Emphasize the narrowing of breathing tubes as the primary cause of difficulty.

READING ASSIGNMENT

Question 6. Read the lesson Animals in their surroundings and prepare 10 question and answers based on the lesson.
Answer:
1. Q: What is a habitat?
A: A habitat is the natural home or environment of an animal, plant, or other organism.
2. Q: Give two examples of terrestrial animals.
A: Lion and elephant.
3. Q: How do fish breathe underwater?
A: Fish breathe using special organs called gills.
4. Q: What are arboreal animals? Give an example.
A: Animals that spend most of their time on trees are called arboreal animals, for example, monkeys.
5. Q: What are aquatic animals?
A: Animals that live exclusively in water, such as whales and fish.
6. Q: What is camouflage?
A: Camouflage is the ability of an animal to blend into its surroundings to hide from predators.
7. Q: Give an example of an animal that undergoes hibernation.
A: Bear.
8. Q: What are amphibians?
A: Animals that can live both on land and in water, such as frogs.
9. Q: Why do birds have hollow bones?
A: Hollow bones make their bodies light, which helps them fly easily in the air.
10. Q: What is migration?
A: Migration is the seasonal movement of animals from one region to another in search of food, warmer climate, or safe breeding grounds.
In simple words: These questions cover key concepts about where animals live and how they adapt to their environments.

Exam Tip: Always provide clear scientific definitions and matching examples for adaptation topics.