LAKSHYA BATCH PHYSICS WALLAH

2021-12-05 19:43:17 Terminology

1. Genetics: The branch of biology concerned with the study of heredity and variation

2. Eugenics: The application of principles of genetics for the
improvement of human kind.

3. Gene pool: The sum total of all the alleles present in the breeding or reproductive members of a random mating population.

4. Gene frequency: The proportion of one allele relative to all the alleles of a gene in a Mendelian population.

5. Cytogenetics: Concerns with the study of various aspects of
chromosomes and their effects on the development of characters of organisms

6. Genome: A complete set of chromosomes of a diploid species

7. The first artificial hybrids in plants were produced by Thomas Fairchild in 1717 when he crossed sweet William with carnation.

8. Euphenics: Deals with the control of hereditary diseases
especially inborn errors of metabolism.

9. Epistasis: When one gene affects in any way the expression of another gene, the phenomenon is called epistasis.

10. Genomics: It refers to the study of the structure and function of entire genome of an organism.

11. Biodiversity: Refers to the total variability present within and among species of all living organisms and their habits

12. Acclimatization: Refers to adaptation or adjustment of an
introduced variety to the new environment.

13. A -line: Means the male sterile parent used in crossing to develop a new hybrid seed. it is the male sterile line.

14. B -line: It is the fertile counter parent of the 'A' line, it is also called the maintainer line.

15. R -line: It is an inbred line which when crossed with a male sterile strain, the resultant hybrid is male fertile.

16. In vitro: biochemical process taking place in a test tubes (in lab.) ओपन / कमेंट

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2021-12-01 18:02:27 Plant Nutrient Deficiency
Terminology

Burning: severe localized yellowing ,scorched appearance.

Chlorosis: general yellowing of the plant tissue; lack of chlorophyll.
Generalized: symptoms not limited to one area of a plant, but rather spread over the entire plant.

Immobile nutrient: not able to be
moved from one part of the plant to
another.

Interveinal Chlorosis: yellowing in
between leaf veins, yet veins remain
green.

Localised: symptoms limited to one leaf or one section of the leaf or plant.

Mobile nutrient: able to be moved from one plant part to another.

Mottling: spotted, irregular,
inconsistent pattern.

Necrosis: death of plant tissue; tissue browns and dies.

Stunting: decreased growth; shorter height of the affected plants. ओपन / कमेंट

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2021-11-24 14:39:01 MUST Watch Also comments in Video on YouTube






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2021-11-24 03:00:29 #Physics #ImportantConcept #jee #neet

C-FRAME

If we attach an Inertial frame of Reference with the centre of mass of many particle system then centre of mass in that frame of reference would be at rest or, Vcm=0 , and such type of reference frames are known as centre of mass frame of reference.


Total Linear Momentum of a many particle system is zero in centre of mass frame of reference i.e., pcm=MVcm=0 since Vcm=0.

Therefore C-reference frames are also known as zero momentum reference frames.

Since in absence of any external force the centre of mass of any system moves with constant velocity in inertial frame of reference therefore for a many particle system C-frame of reference is an inertial frame of reference.

Reference frames connected to laboratory are known as L-frame of reference or laboratory frame of reference. ओपन / कमेंट