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Ask QuestionPosted by Shekhar Baghel 4 years, 9 months ago
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Jyoti Yadav 4 years, 9 months ago
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Posted by Tanya Bhadauriya 4 years, 10 months ago
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Gaurav Seth 4 years, 10 months ago
Excretion is a biological process by which an organism get rid of excess or toxic waste products of metabolism.
Excretion removes unwanted by-products of metabolism,toxic chemical substances,regulate the ionic concentration of body fluids,regulates water content of body,regulate pH of body fluids.
Yogita Ingle 4 years, 10 months ago
Excretion
- Excretion is a biological process by which an organism get rid of excess or toxic waste products of metabolism.
- Excretion removes unwanted by-products of metabolism,toxic chemical substances,regulate the ionic concentration of body fluids,regulates water content of body,regulate pH of body fluids.
Posted by Ayush Rock 4 years, 10 months ago
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Gaurav Seth 4 years, 10 months ago
जब एक श्वेत प्रकाश किरण (सूर्य का प्रकाश) एक काँच के प्रिज्म (सघन माध्यम) में प्रवेश करता है। यह बाहर आता है एवं सात रंगों में विभक्त हो जाता है।
यह घटना, जिसके कारण एक श्वेत प्रकाश के विभिन्न घटक अलग-अलग हो जाते हैं। विक्षेपण कहलाता है।
स्पष्टीकरण : यह श्वेत प्रकाश के विभिन्न घटकों के विभिन्न अपवर्तनांकों के कारण होता है।
श्वेत प्रकाश सात रंग रखती है, जिनका नाम, बैंगनी, गहरा नीला, नीला, हरा, पीला, नारंगी और लाल (जिन्हें शब्द VIBGYOR से याद रखा जाता है) हवा में (मुख्यत: निर्वात में) सभी रंगों की प्रकाश तरंगें समान वेग रखती है (3 × 108 m/s).
लेकिन एक सघन माध्यम में, उनके वेग कम होते है एवं अलग-अलग होते हैं। लाल प्रकाश की तरंगें लम्बार्इ में सबसे लम्बी होती है, सबसे तेज चलती है और सबसे अधिक वेग रखती है। बैंगनी प्रकाश की तरंगें, लम्बार्इ में सबसे छोटी, सबसे धीरे चलती है और सघन माध्यम में सबसे कम वेग रखती है।
एक तरंग के लिए एक माध्यम का अपवर्तनांक (µ) निम्न सम्बन्ध द्वारा दिया जाता है।
चूंकि बैंगनी रंग की प्रकाश तरंग के लिए µ सर्वाधिक होता है, इसलिए यह सबसे अधिक मुड़ती है।
जब यह विक्षेपित श्वेत प्रकाश को श्वेत पर्दे पर गिरने दिया जाता है, हम एक सात रंगों का प्रकाश या पट्टी प्राप्त करते हैं। यह रंगीन पट्टी स्पेक्ट्रम कहलाती है।
Posted by Tanya Bhadauriya 4 years, 10 months ago
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Yogita Ingle 4 years, 10 months ago
Stomata are the tiny openings present on the epidermis of leaves. We can see stomata under the light microscope. In some of the plants, stomata are present on stems and other parts of plants. Stomata play an important role in gaseous exchange and photosynthesis. They control by transpiration rate by opening and closing.
The main functions of stomata are:
- Gaseous exchange- Stomatal opening and closure help in the gaseous exchange between the plant and surrounding.
- It helps in transpiration and removal of excess water in the form of water vapour.
- Stomatal closure at night prevents water from escaping through pores.
- It maintains the moisture balance according to weather by opening and closing.
- Stomata facilitate carbon dioxide uptake and release of oxygen during the process of photosynthesis.
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Yogita Ingle 4 years, 10 months ago
The tiny projections on the inner surface of the small intestine which help in absorbing the digested food are called villi. These helps to increase the surface area of intestinal walls. These are located in the inner walls of the small intestine.
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Isha Dhankhad 4 years, 10 months ago
Yogita Ingle 4 years, 11 months ago
Full form of pH is power of hydrogen or potential of hydrogen
Its is used to determine the acid or base levels of the substances. 0 to 7 is considered acidic 7 Is neutral and 7 to 14 is basic.
Tooth decay occurs when pH falls below 5.5 because the mouth becomes acidic. And the accumulation of acids erodes the teeth. That's why we use basic toothpastes to brush our teeth
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Meghna Thapar 4 years, 11 months ago
The lining thickens and is richly supplied with blood to nourish the growing embryo. The embryo gets nutrition from the mother’s blood with the help of a special tissue called placenta.
Placenta is a disc like special tissue which develops between the uterus wall and the embryo after implantation. Its function is the exchange of nutrients, oxygen and waste products between the embryo and the mother. It contains villi on the embryo’s side of the tissue. On the mother’s side are blood spaces, which surround the villi. This provides a large surface area for glucose and oxygen to pass from the mother to the embryo. The developing embryo will also generate waste substances which can be removed by transferring them into the mother’s blood through the placenta. The time period from the fertilisation up to the birth of a baby is called gestation. The average gestation period in humans is about 9 months (about 38 weeks).The child is born as a result of rhythmic contractions of the muscles in the uterus.
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Aashish Raj 4 years, 9 months ago
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