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# Radioactivity:- It is the phenomenon of spontaneous disintegration of the nucleus of an atom with the emission of one or more penetrating radiation like &pr
Structure of Embryo Sac (Female Gametophyte):
In angiosperms, the female ga- metophyte is called embryo sac. Embryo sac is an oval multicellular haploid structure
Ortho and Para hydrogen:
A molecule of dihydrogen contains two atoms, in which the nuclei of both the atoms are spinning. Depending upon the direct
Structure of Ovule:
Ovule is an integumented megasporangium found in sper- matophytes which develops into seed after fertilisation. An angiosperm o
Kingdom Fungi:
i) They are heterotrophic.
ii) They are cosmopolitan and prefer to grow in warm and humid places.
Composition of Nucleus:
An atom has a positively charged nucleus. The radius of the nucleus is smaller than the radius of an atom by a factor of 10
Difference between meiosis and mitosis:
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Interatomic Forces
The forces between the atoms due to electrostatic interaction between the charges of the atoms are called interatomic forces. Th
Double Fertilisation
The pollen tube releases the two male gametes into the cytoplasm of the synergid .One male gametes
fuses with egg cell
Cyclotron: It is a device used to accelerate charged particles like protons, deuterons, α particles, etc. to very high energies.
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Endosperm formation
Electron Emmision-The liberation of electrons from the surface of a metal due to any reason is known as Electron Emission.
If we atke a piece
Nuclear forces: The strong attractive forces acting between the neutrons and the protons which keep them bound together inside the tiny nucleus are called
1. Fission:
It is that type of asexual reproduction in which a fully grown parent organism divides into two or more than two daughter cells.
In this ca
SEXUAL REPRODUCTION involves formation of male and female gamates, either by the same individual or different individuals of opposite sex.These gametes
NUCLEIC ACIDS
Nucleic acids are biopolymers. It constitutes an important class of bio molecules, which are found in the nuclei of all living cells
GYMNOSPERMS
Gymnosperms are naked seeded plants with their ovules freely EXPOSED. The Jurassic period perhaps the best time for G
Test Details
Atoms whose nuclei contain different number of protons but same number of neutrons are called
Test Details
If two nuclei of masses m1 and m2 fused to form a nucleus of mass m and some energy is released, then
Test Details
Radioactive nuclei that are injected into a patient collect at certain sites within its body, undergoing radioactive decay and emitting electromagnetic radiation. These radiations can then be recorded by a detector. This procedure provides an important diagnostic tool called
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