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प्र.21. जाइलम एवं फ्लोयम में अंतर स्पष्ट कीजिए।
Answers
Answer:
जाइलम और फ्लोएम में मुख्य अंतर
जाइलम
1). जाइलम जड़ से पत्तियों तथा अन्य भागो में जल तथा घुले लवण परिवहन करते है ।
2). जाइलम में पदार्थ का परिवहन वाहिकाओं तथा वाहिनियों द्वारा होता है , जोकि मृत उतक है ।
3). वास्पोत्सर्जन पुल के कारण ऊपर की ओर जल तथा घुले लवणों का चढना संभव होता है। यह पत्ती की कोशिकाओं से जल अणुओं के वास्पीकरण से उत्पन्न खिंचाव के कारण हो पाता है ।
4). जल का परिवहन सरल भौतिक गति के अंतर्गत होता है । उर्जा खर्च नहीं होता है। अतः ATP की आवश्यकता नहीं है ।
फ्लोएम
1). फ्लोएम , भोजन पदार्थो को घुली अवस्था में पत्तियों से पौधे के दुसरे हिस्सों तक परिवहनित करता है ।
2). फ्लोएम में पदार्थो का परिवहन चालनी नलिकाओं द्वारा सहचर कोशिकाओं की सहायता से होता है , जो जैविक कोशिकाए हैं ।
3). स्थानांतरण में, पदार्थ फ्लोएम उतक में ATP उर्जा का इस्तेमाल करते हुए होता है । यह परासरण दाब बढ़ा देता है जोकि फ्लोएम से पदार्थो को उतकों की ओर भेजता है , जिनमे दबाव कम होता है ।
4). फ्लोएम में स्थानांतरण एक सक्रिय क्रिया है तथा इसमें उर्जा की आवश्यकता होती है। यह उर्जा ATP से प्राप्त होती है ।
Answer:
Xylem is a vascular tissue that transports water and dissolved minerals absorbed from the roots to the rest of the plant.
Xylem is a vascular tissue that transports water and dissolved minerals absorbed from the roots to the rest of the plant.The term xylem is derived from the Greek word ‘xylon’ which means wood as the best-known xylem tissues are found in the woody part of the stem.
Xylem is a vascular tissue that transports water and dissolved minerals absorbed from the roots to the rest of the plant.The term xylem is derived from the Greek word ‘xylon’ which means wood as the best-known xylem tissues are found in the woody part of the stem.When observed under the microscope, xylem tissue has a star-like appearance.
Xylem is a vascular tissue that transports water and dissolved minerals absorbed from the roots to the rest of the plant.The term xylem is derived from the Greek word ‘xylon’ which means wood as the best-known xylem tissues are found in the woody part of the stem.When observed under the microscope, xylem tissue has a star-like appearance.The cells in this tissue are mostly dead cells, and the cells are lignified. The cell wall is thick and made up of lignin which aids in its function of providing support.
and about phloem
Phloem is a vascular tissue that transports soluble organic compounds prepared during photosynthesis from the green parts of the plant to the rest of the plant.
Phloem is a vascular tissue that transports soluble organic compounds prepared during photosynthesis from the green parts of the plant to the rest of the plant.The term phloem is taken from the Greek word ‘phloios’ which means bark, as the phloem makes up most of the bulk of the bark of the plants.
Phloem is a vascular tissue that transports soluble organic compounds prepared during photosynthesis from the green parts of the plant to the rest of the plant.The term phloem is taken from the Greek word ‘phloios’ which means bark, as the phloem makes up most of the bulk of the bark of the plants.Phloem tissue is present towards the periphery of the vascular bundles and is less in quantity than the xylem tissue.
Phloem is a vascular tissue that transports soluble organic compounds prepared during photosynthesis from the green parts of the plant to the rest of the plant.The term phloem is taken from the Greek word ‘phloios’ which means bark, as the phloem makes up most of the bulk of the bark of the plants.Phloem tissue is present towards the periphery of the vascular bundles and is less in quantity than the xylem tissue.Phloem, like xylem, is comprised of several specialized cells like sieve tubes, companion cells, phloem fibers, and phloem parenchyma. These cells are also living cells and are not lignified.