Chapter 5: Seeds and Seeds
बीज, बीज, बीज (शिकारी पौधे, वेल्क्रो एवं बीजों का प्रकीर्णन)
Don't Let a 20-Minute Bubbling Delay Cost You CTET Qualification
In offline CTET exams, bubbling 150 bubbles takes 18 to 22 minutes of mechanical time. A single misaligned row can trigger an 8-question domino error. Practice bubble-filling this chapter's solved MCQs inside Mentora's official OMR simulator.
- Nepenthes (Pitcher Plant / घटपर्णी): Insectivorous plant found in Australia, Indonesia, and Meghalaya (India). Traps frogs, insects, and mice using an attractive sweet scent (NOT sound).
- Velcro invention (1948): Invented by Swiss engineer George de Mestral after observing burdock seeds clinging to his dog's fur; contains tiny hooks and loops.
- Seed dispersal mechanisms: Wind (light hairy seeds like Calotropis/Aak), Water (floating fibrous husks like Coconut), Animals (hooked seeds like Xanthium clinging to fur), Bursting pods (Soybean pods dry and burst open with a popping sound).
- Origins of everyday crops: Green chilies, tomato, and potato came from South America (via Portuguese traders); Cabbage and peas came from Europe; Coffee beans and bhindi (okra) came from Africa; Soybeans came from China.
- Trap: CBSE claims Nepenthes emits high-pitch sounds to trap insects. Correct: Nepenthes emits a pleasant sweet smell (scent), NOT sounds.
- Trap: CBSE claims chilies originated in Europe or India. Correct: Chilies, tomatoes, and potatoes originated in South America.
- Trap: CBSE claims George de Mestral invented Velcro in 1990. Correct: Swiss engineer George de Mestral invented Velcro in 1948.
NCERT Core Facts: Seeds, Dispersal & The Pitcher Plant
Chapter 5 explores germination conditions (air, water, warmth), seed dispersal adaptations, and bio-inspired inventions like Velcro.
1. Nepenthes (Pitcher Plant / शिकारी पौधा घटपर्णी)
2. George de Mestral & The Invention of Velcro (1948)
- In 1948, Swiss engineer George de Mestral went for a walk with his dog. Upon returning home, he observed strange burr seeds (Burdock seeds) sticking tenaciously all over his clothes and his dog's fur.
- He examined these seeds under a microscope and discovered that each seed had thousands of tiny hooks that snagged onto loops in fabric.
- Inspired by nature, he invented Velcro—two fabric strips with hooks and soft loops that stick together and peel open with a distinctive tearing sound.
- Today, Velcro is used universally in shoes, clothes, school bags, and blood pressure belts.
3. Global Origins of Everyday Vegetables (CBSE Poem Table)
Traders throughout history carried native seeds across continents to India:
| Vegetable / Crop | Continent of Origin | Historical Context |
|---|---|---|
| Green Chilies (हरी मिर्च) | South America (दक्षिण अमेरिका) | Brought to India by Portuguese traders via Goa. |
| Tomato (टमाटर) | South America | Traveled alongside chilies and potatoes. |
| Potato (आलू) | South America | Indigenous to the Andean highlands. |
| Cabbage (पत्तागोभी) | Europe (यूरोप) | Arrived through maritime European trade. |
| Peas (मटर) | Europe | Popularized during winter cultivation. |
| Coffee Beans (कॉफी) | Africa (अफ्रीका) | Grown extensively in Ethiopian highlands originally. |
| Bhindi / Okra (भिंडी) | Africa | Brought to tropical Asia. |
| Soybean (सोयाबीन) | China (चीन) | Pods burst with sound when ripe, dispersing seeds. |
| Mango, Banana, Brinjal, Methi | Native to India (भारत के देसी) | Native Indian subcontinent flora. |
Test Your Mastery: Seeds and Seeds
Authentic CBSE exam questions tested directly from this NCERT chapter.
Which of the following statements is true about the plant named 'Nepenthes' (Pitcher plant)?
'नेपेंथीस' (घटपर्णी) नामक पौधे के विषय में कौन सा कथन सही है?
Green chili was brought to our country by traders coming from:
हमारे देश में हरी मिर्च को लाने वाले व्यापारी कहाँ से आए थे?
In 1948, who among the following was inspired by seeds clinging to clothes and dog fur to invent 'Velcro'?
1948 में निम्नलिखित में से किसने कपड़ों तथा कुत्ते के फर पर चिपके बीजों से प्रेरित होकर 'वेल्क्रो' बनाया था?
How does the Pitcher Plant (Nepenthes) attract insects according to CTET?
The Pitcher plant (Nepenthes) attracts insects by emitting a special sweet scent (खुशबू), not by making sounds. It is found in Meghalaya (India), Australia, and Indonesia.
From where did green chilies, tomatoes, and potatoes come to India?
According to NCERT Class 5 EVS, green chilies, tomatoes, and potatoes were brought to India from South America by Portuguese traders.
Who invented Velcro and what was the natural inspiration?
Swiss engineer George de Mestral invented Velcro in 1948 after observing tiny hooks on burdock seeds sticking to his clothes and his dog's fur.