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Ask QuestionPosted by Pari Agarwal 3 years, 1 month ago
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Somya Jaiswal 3 years ago
Posted by P Daksh 3 years, 1 month ago
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Preeti Dabral 3 years, 1 month ago
|
Self-Pollination |
Cross-Pollination |
|
In self pollination, pollen grains are transferred from the anther of a flower to the stigma of the same flower. |
In cross pollination, pollen grains are transferred from the anther of a flower to the stigma of another flower, either on the same plant or on another plant of the same kind. |
|
No agents are required. |
Agents like wind, air or insects are required. |
|
Occurs only in bisexual flowers. |
Occurs in both unisexual and bisexual flowers. |
| Transfers small number of pollen grains. | Transfers large number of pollen grains. |
| Transferred through insects, wind, water, animals, etc. | Transfer directly onto stigma. |
Posted by Krishna Sharma 3 years, 1 month ago
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Preeti Dabral 3 years, 1 month ago
An atom is a particle that consists of a nucleus of protons and neutrons surrounded by a cloud of electrons. The atom is the basic particle of the chemical elements, and the chemical elements are distinguished from each other by the number of protons that are in their atoms.
Moosa Abdul Aziz 3 years, 1 month ago
Posted by Vanshika Kewat 3 years, 1 month ago
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Preeti Dabral 3 years, 1 month ago
Certain pteridophytes produce two kinds of spores. This phenomenon is called heterospory.
Heterospory is the crucial step in evolution. This ultimately led to seed development in gymnosperms and angiosperms.
Examples: Selaginella, Salvinia.
Posted by Anshul Pillay 3 years, 1 month ago
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Preeti Dabral 3 years, 1 month ago
समय का सदुपयोग
समय का सदुपयोग समय अमूल्य धन है। समय को खोना जीवन को खोना है। बीता हुआ समय कभी वापस नहीं आता। जीवन के बीते दिन हम वापस नहीं पा सकते इसलिए यह ज़रूरी है कि समय के प्रत्येक क्षण का सदुपयोग किया जाए। इस प्रकार जीवन के हर पल का हम लाभ और आनंद ले सकेंगे। समय का दुरुपयोग मनुष्य के लिए घातक, उन्नति में बाधक तथा पश्चाताप का कारण बनता है। समय का दुरुपयोग करने वाला व्यक्ति कभी सफल नहीं हो सकता है इसलिए समय के महत्त्व को समझना और इसका सदुपयोग करना अत्यंत आवश्यक है। जीवन में सफलता प्राप्त करने के लिए समय का सदुपयोग करना बहुत ज़रूरी है। महान व्यक्तियों की सफलता का रहस्य समय का सदुपयोग ही है। विद्यार्थी के लिए समय का सदुपयोग तो और भी आवश्यक है। विद्यार्थी जीवन समस्त जीवन का आधार होता है। समय को नष्ट करने वाला अपना पूरा भविष्य ही बिगाड़ लेता है। बाद में पछताने पर भी कोई लाभ नहीं होता है। जो व्यक्ति अपने जीवन के प्रत्येक क्षण का सदुपयोग करता है, वही भाग्यवान है। ऐसा व्यक्ति ही जीवन में सदा प्रसन्न, संतुष्ट और संपन्न रहता है। वैयक्तिक जीवन हो या सामाजिक, समय का सदुपयोग ही सफलता का एकमात्र रास्ता है। एक मिनट की मुस्तैदी से विजय का सेहरा सिर बँधता है और एक मिनट की चूक से पराजय की कालिख लगती है। गया धन, गया जन, गया स्वास्थ्य फिर लौट सकता है लेकिन गया हुआ समय किसी भी प्रकार नहीं लौट सकता इसलिए समय का यह महत्त्व समझ कर जो मनुष्य जीवन में आचरण करते हैं, वही समाज के अगुआ, पूज्य और पथ-प्रदर्शक बनते हैं।
Posted by Khushiraj Kharte 3 years, 1 month ago
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Preeti Dabral 3 years, 1 month ago
Acid rain is a rain or any other form of precipitation that is unusually acidic. When fossil fuel such as coal and petroleum are burnt, they produce air-polluting gases such as sulphur dioxide and nitrogen dioxide. These gases react with the water vapour in the atmosphere and eventually form dilute solutions of sulphuric acid and nitric acid. These acids mix with rain water and come down in the form of acid rain. It can have harmful effects on human beings, vegetation, aquatic animals and buildings.
Posted by Khushiraj Kharte 3 years, 1 month ago
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Preeti Dabral 3 years, 1 month ago
Acid rain is rain with a pH of less than 5 due to dissolution of sulphur dioxide, nitrogen oxides and hydrochloric acid in it. Acid rain is caused when the oxides of nitrogen and sulphur are precipitated from the rain water. These oxides are present in the upper atmosphere and when rain falls these oxides get dissolved in rain water and forms nitric acid and sulphuric acid thus makes it acidic.
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Preeti Dabral 3 years, 1 month ago
Some of the measures to save forests are:
- By planting more trees.
- Control over a forest fire.
- Regulated and planned cutting of trees.
- Reforestation.
Posted by Aman Dahayat 3 years, 1 month ago
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Preeti Dabral 3 years, 1 month ago
उनके माता-पिता अब उनके लिए भोजन लेकर आते ही होगें। अतः वे अपने माता-पिता को देखने के लिए नीड़ों से झाँक रहे हैं। माता-पिता से उनका मिलन हो जाएगा तथा उनके पेट की आग भी शांत हो जाएगी। इस तरह नीड़ों से झाँकना उनकी प्रतीक्षा को दर्शाता है।
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Repo rate is the rate at which the central bank of a country (Reserve Bank of India in case of India) lends money to commercial banks in the event of any shortfall of funds.
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