Kitab Nagri

Why Bryophytes are called Amphibians   Although bryophytes have mostly dispensed with water, still they need water for sexual reproduction because their male gametes are flagellated and motile. For this reason the bryophytes are also called amphibious plants.   This helps to reduce the level of glare from external light sources by “smearing” their reflections.…

Basic Characteristics of Funaria   Habitat: – It is common moss and found growing at damp places.   Size: – Its size is half to an inch.   Structure: It consists of three parts.   i) A vertical stem like structure.   ii) Leaf like photosynthetic structure.   iii) Multicellular rhizoids arising from the lower…

Alternation of Generation   In the life cycle of bryophytes, two types of multicellular generation “sporophyte” and gametophyte alternate with each other; the gametophyte generation gives rise to sporophyte generation and the sporophyte gives rise to gametophytes. This phenomenon is called alternation of generation.   The disadvantages of such screens include the fact that, for…

General Characteristics of Bryophytes   i) Bryophytes are the plants without vascular tissues (xylem & phloem).   ii) Bryophytes are the simplest plants.   iii) There are three groups of bryophytes Liverworts. One example of liverworts is marchantia. Hornworts. One example of hornworts is anthoceros. Mosses. One example of mosses is funaria.   iv) AII…

Characteristics of Plants   i) Plants are multicellular organisms.   ii) They are photosynthetic eukaryotes.   iii) In plants, zygote develops into a small-protected embryo that develops into a complete new plant, hence bryophytes have been called embryophytes.   iv) They have a cell wall made up of cellulose (dead cells)   v) Their reproductive…

What is Nuclear Fusion   The process in which two lighter nuclei are brought together to form another heavy nucleus is called the Fusion Reaction.   When Deuterium and Tritium nuclei are brought together they form a Helium nucleus and release a large amount of energy and a neutron.   The brightness control is usually…

What is Nuclear Reactor   A system used to obtain a controlled amount of heat from nuclear fission is called a nuclear reactor.   Working of a Nuclear Reactor:   The fission material in a nuclear reactor is Uranium. This is called fuel element. The neutrons released from fission move with high velocities. The fast…

What is Chain Reaction   In a fission reaction, each nucleus emits three neutrons. These neutrons collide with the other uranium nuclei and cause fission in them emitting three more neutrons. These neutrons produce further fission in other nuclei and this process continues. This is called a Chain Reaction,   Advantages and disadvantages of e-books…

Properties of Gamma Rays   Gamma rays are electromagnetic in nature.   They are neutral rays.   Its velocity is equal to the velocity of light.   Ionization power is least.   Its penetration power is the greatest.   It effects the photographic plate.   It produces florescence with Barium Platina Cyanide.   But with…

Properties of Beta Particles   Beta particles are fast moving electrons.   The charge on beta particles is negative.   Its velocity is slightly less than the velocity of light.   Ionization power is less than alpha particles,   Its penetration power is greater than alpha particles.   It effects the photographic plate.   It…