NEET_JEE_NCERT_TRICKS

2021-10-06 16:17:49 Features of Kingdom-Animalia:-

The characteristic features ofthis kingdom are
(a) Absence of cell wall.
(b) Inorganic crystals are not present in their cells.
(c) Central vacuole is not present.
(d) Heterotrophic mode of nutrition.
(e) Growth is limited and well defined growing points are not present.
(f) Reserve food as glycogen.
(g) Excretory organs, nervous system and sense organs are present.
(h) Locomotion is present.
(i) Muscular system is present.
(j) Show quick response to external stimuli.

Objections Against Two Kingdom Classification System
The two kingdom system of classification was accepted for a long time. However, some difficulties arised from this classification as several new living organisms have been discovered.

Some of these difficulties are mentioned below:-

(a) The first formed organisms were neither plants nor animals.

(b) Fungi do not show similarity with structure, physiology and reproductive system of plants.

(c) It is not easy to recognise the lower organisms as plants or animals. For example, Euglena has mixotrophic (dual) mode of nutrition, while sponges are fixed, branched and irregular creatures like plants.

(d) Slime moulds, a group of fungi, are wall-less in vegetative phase. They develop cell wall in the reproductive phase. Slime moulds can neither be placed in fungi, nor plants.

(e) Lichens are formed by the symbiotic association of an alga and a fungus. They neither resemble plants nor animals.

(f) Prokaryotes do not have an organised nucleus. They have single envelope organisation, absence of spindle apparatus, meiosis and sexual reproduction.

Eukaryotes have a well-defined nucleus, a double envelope organisation, spindle apparatus, meiosis and sexual reproduction.

On the other hand, viruses have no protoplasm and metabolic machinery of their own. Therefore, all of these cannot be kept in a single group.

(g) Unicellular algae like diatoms, euglenoids, dinoflagellates and Protozoa resemble each other. Open / Comment

2021-10-06 08:09:17 ​​Functions Of Plasma Membrane


1. The fluid nature of the membrane is important from the point of view of functions like call growth, formation of intercellular junctions, secretion, endocytosis, cell division, etc.

2. Plasma membrane allows the transport of the molecules across it. The membrane is selectively permeable to some molecules present on either side of it. The passage of substances across cell membranes occurs by various methods such as passive transport, active transport.

(i) Passive transport: Many molecules can move across the membrane without any requirement of energy and this is called the passive transport Neutral solutes may move across the membrane by the process of simple diffusion along the concentration gradient i.e., from higher concentration to the lower

Water may also move across the plasma membrane from higher to lower concentration. The movement of water by diffusion through membrane is called osmosis. As the polar molecules cannot pass through the non-polar lipid bilayer, they require a carrier protein of the membrane to facilitate their transport across the membrane.

(ii) Active transport: It is an uphill movement of materials across the membrane where the solute particles move against their concentration gradient i.e.. from their lower to higher concentration. Such a transport requires energy, which is obtained from ATP. Thus, it is an energy dependent process,

For example, Na+/K+ pump in animal cells.

@Science_Wallah Open / Comment

2021-10-06 06:59:50 Revision Notes on Hydrogen:
Hydrogen Element:
Atomic number = Mass Number = 1

Isotopes of hydrogen:

1H1 : Protium , Most abundant in nature
2H1: Deuterium (D), Component of heavy water.
3H1 : Tritium (T) , Radioactive in nature
Dihydrogen:
a. Laboratory preparation:
Reaction of metals with acids. Zn + H+→ Zn2++H2
b. Commercial Preparation:

Electrolysis of acidified water

Electrolysis of warm aqueous Ba(OH) 2 between nickel electrodes.

By-product in the manufacture of NaOH and Cl2 by electrolysis of brine solution. Open / Comment

2021-10-06 06:11:45 Without Snapsolve Doubt Genie @snapsolve_bot bahaut saare hongey DOUBTS aur confusing Learning Material

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2021-09-30 20:57:29 Ecological succession

Xerarch succession/Terrestrial environment.

Trick - Large MAPS Collection.

Lichens, Mosses, Annual grasses, Perennial grasses, Shrubs, Climax community.

Hydrarch succession/Aquatic environment.

Trick - Pretty Starlets Feel Shy of Males with Charisma.

Plankton, Submerged plants, Floating plants, Swamps, Marshy meadow, Climax community. Open / Comment

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2021-09-29 19:45:31 Connecting Links :-

Virus - Between living and non living
Euglena - Between plants and animals
Proterospongia - Between protozoa and porifera
Neopilina - Between annelida and mollusca
Peripatus - Between annelida and arthropoda
Balanoglossus - Between non chordata and chordata
Chimera - Between cartilaginous and bony fishes
Protopterus (Lung fish) - Between fishes and amphibian
Seymauria - Between amphibia and reptilia
Archaeopteryx - Between reptiles and birds
Platypus and Echidna - Between reptiles and mammals

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@Science_Wallah Open / Comment

2021-09-29 19:23:39 Doubtnut ke Study Channels par ab sirf Instant doubt solving hi nahi
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2021-09-29 11:03:20 Some Important Tricks

PURines (A, G) – PURe As Gold.

A- Adenine
G- Guanine

PYrimidines (C, U, T)-CUT the PY (pie).

C- Cytosine
U- Uracil
T- Thymine Open / Comment