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Development of a dicot embryo (i) Embryo formation starts after a certain amount of endosperm is formed. (ii) Zygote divides by mitosis to form a proembryo. (iii) Formation of globular and heart-shaped embryo occurs, which finally becomes horse shoe-shaped forms a mature embryo. (iv) In dicot plants, embryo consists of two cotyledons and an embryonal axis between them.(v) The portion of embryonal axis above the level of attachment of cotyledons is epicotyl and it terminates in the plumule. (vi) The portion of embryonal axis below the level of attachment of cotyledon is the hypocotyl, it becomes radicle (root tip). The embryonic stages during the development of a mature embryo sac are:
(a) Fertilised embryo sac showing zygote and Primary Endosperm Nucleus (PEN).
(b) Stages in embryo development in a dicot
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Atoms and molecules are too small to count. To solve this problem their numbers are expressed in terms of Avogadro’s number (NA = 6.023 1023). Mole is the number equal to Avogadro’s number just like a dozen is equal to 12, a century means 100, a score means = 20.
Mole can be defined as a unit which represents 6.023 x1023 particles of same matter.
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- Sound is a form of energy which produces a sensation of hearing in our ears.
- Sound is produced due to the vibration of objects. Vibration is the rapid to and fro motion of an object.
- Vibrating objects are the source of all sounds Irregular, chaotic vibrations produce noise Regular, controlled vibration can produce music All sound is a combination of pure frequencies
- A stretched rubber band when plucked vibrates and produces sound.
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