NCERT SOLUTIONS FOR CLASS 12 BIOLOGY PDF
The NCERT Biology Class 12 Solutions Free PDF is included on the Vedantu website as a free download which anyone can access with a basic internet. yazik.info - No.1 online tutoring company in India provides you Free PDF download of NCERT Solutions for Class 12 Biology Chapter 1 - Reproduction in . BYJU'S bring you NCERT Solutions for Class 12 Biology where the students can easily prepare all the concepts covered in the syllabus of class 12th biology in.
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Download NCERT Solutions Biology Class 12, Free download in pdf NCERT Solutions for Class 12 Biology for all chapters in NCERT book. Chapter wise. NCERT Solutions For Class 12 Biology PDF Download. NCERT Solutions For Class 12 Biology Chapter 1 Reproduction in Organisms, Chapter 2 Sexual. NCERT Solutions for Class 12 Biology includes all the questions provided in NCERT Books for 12th Class Biology Subject. Here all questions are solved with .
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NCERT Solutions For Class 12 Biology PDF Download
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Chemistry Formula. Question Papers. Previous Year Question Paper. Quick Links. Toll Free: These could be saprophytic or gametophytic incompatibility.
Prevent of pollen germination, retardation of growth, reorientation of pollen tube, failure of nuclear fusion could be one of the reason. What is bagging technique? How is it useful in a plant breeding programme? Bagging is a technique used to prevent the fertilization of stigma from unwanted pollen by covering the emasculated flower with butter-paper.
It is useful in a plant breeding programme because it prevents from unwanted cross pollination. It is fusion of three haploid nuclei during double fertilization. It takes place in the central cell between one male gamete and two polar nuclei and it forms triploid primary endosperm nucleus.
Why do you think the zygote is dormant for sometime in a fertilized ovule? It is so because development of endosperm precedes development of embryo and nutrition to developing embryo is provided by endosperm tissue. Sexual Reproduction In Flowering Plants. Epicotyl has a shoot apex and a few leaf primordial enclosed in hollow foliar structure called Coleoptile.
At the lower end of embyonal axis, it has the radical and root cap enclosed in undifferentiated sheath called coleorrhiza. Why apple is called a false fruit? Which parts of the flower forms the fruit? Fruits are mainly matured ovary together with structures close to ovary but after the formation of fruit, structures other than ovary degenerates and fall off.
What is meant by emasculation? When and why does a plant breeder employ this technique? It is a technique done manually in which anthers from flower bud are removed before the pollen dehisces. It is done by plant breeders to produce species of plants having desirable characters by cross-pollination of own choice. If one can induce parthenocarpy through the application of growth substances, which fruits you would select to induce parthenocarpy and why?
It is a process in which fruits are produced by the use of growth hormones like auxins and gibberellines. It is either done natural or induced.
CBSE - Class 12 - Biology - NCERT Solutions
No fertilization takes place in parthenocarpic fruits. Innermost wall of microsporangium is called tapetum. Tapetal cells may have uni, bi or multi nucleate and have dense cytoplasm. In apomixes process, seeds are produced without fertilization.
NCERT Solutions for Class 12 Biology Chapter 1
Pollen Viability: Pollens of wheat and rice remain viable for 30 minutes. Pollens of same other plants may remain viable for several months. Dicot Embryo: A typical dicot embryo consist of an embryonal axis and two cotyledons. The portion of embryonal axis above the level of cotyledons is the epicotyl and the portion below the level of cotyledons is hypocotyl.
Monocot Embryo: Monocot Rice, Maize etc.
Biology NCERT Solutions for Class 12 - Free PDF Download (All Exercises are Covered with Answers)
The embryonal axis has the radicle and root cap enclosed by a sheath called Coleorrhiza. The upper end epicotyle has plumule which is covered by hollow foliar structure called the coleoptile.
Apomixis: Apomixis is a form of asexual repduction that mimics sexual reproduction where seeds are formed without fertilisation.No enzyme can degrade it. Pollen Products: Pollen grains are rich in carbohydrates, proteins and unsaturated fats.
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NCERT books, exemplar books, revision books and other important questions related study material for class xii. Visit to Class 12 Biology main page or Top of the page Important Terms related to 12 Biology Chapter 9 Apiculture: Rearing of honeybees for the production of honey, bee wax, royal jelly and bee Venom.
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