Bihar Board 12th Biology Important Questions Short Answer Type Part 1 are the best resource for students which helps in revision.
Bihar Board 12th Biology Important Questions Short Answer Type Part 1
Draw a well labelled diagram of a typical flower.
Draw a well labelled diagram of a pollen grain.
In algae and fungi which structure help in asexual reproduction.
Thallus in algae and spores in fungi help in asexual reproduction.
What is double fertilization?
One male gamete fuses with egg to form zygote and another male nucleus fuses with polar nuclei. Hence male nuclei fuse double is called double fertilization.
What is pollination by Bat?
Chiropterophily e.g. Kadam
Describe different parts of Seed.
Seed Coat, embryo, endosperm and cotyledon.
Which type of fruit develops from hypanthodium?
Syconus eg. Fig. Peepal.
Why vegetative reproduction is also considered as a asexual reproduction?
Reproduction occurs by any part of body other than flower in plant is called asexual reproduction.
What is law of Mendel?
- Mendel took only those trait which did not show linkage interaction.
- Plan pea is ideal for controlled breeding.
Name any two reasons for Mendel’s success.
- Mendel selected only pure breeding varieties of pea for his experiments.
- Mendel took one or two characters at one time for his breeding experiments.
What is genotypic and phenotypic ratio of monohybrid and dihybrid corss?
- Phenotypic Ratio 3 : 1
- Genotypic Ratio 1 : 2 : 1
- Phenotypic Ratio 9 : 3 : 3 : 1
- Genotypic Ratio 1 : 2 : 1 : 2 : 4 : 2 : 1 : 2 : 1
What is Polyploidy?
Increase in number of chromosome or set of chromosomes is called polyploidy.
What is multiple alleles?
It is present more than two alleles of a gene.
What is difference between DNA and RNA.
|1. Nitrogen Base||Thymine and cytosine Adenine & Guanine||Uracil and Cytosine Adenine and Guanine|
|2. Sugar||Deoxyribose Sugar||Ribose Sugar|
What are Okazaki fragments and what enzymes join them?
A small fragment of lagging strand of DNA that contains numerous nucleotides.
-DNA ligase join them.
A group of genes making up a regulatory or control unit.
What is reverse transcription?
RNA → DNA → RNA → Protein.
Major function of gene.
- Genetic information
AUGCCG is base sequence in mRNA write base sequence in DNA?
What is Peptide Bond?
A bond between two amino acid is called peptide bond.
What is main source of variation in gene pool?
- Genetic drift
- gene migration.
How the gene expression is carried out at translocation level.
Gene expression occurs by Repressible regulation/control or negative control and by positive control or inducible control processes.
What are the terms given by Benzor for genes.
Cistron was given by Benzer.
What is tissue culture?
It is a technique of maintaining and growing plant cells, tissue or organs especially on artificial medium in suitable containers under control environmental conditions.
Name some genetically engineered crop plants.
- Bt Cotton
- Golden rice
- Transgenic Tobacco
- Flaur Saure
What is Apiculture and Sericulture.
Apiculture – It is rearing of honey bees for obtaining honey and bee wax.
Sericulture – It is an art for breeding of Silk Worm to produce Silk.
What is Special about Bacillus Thuringiensis?
Bacillus thuringiensis is a soil bacterium that produces cry protein which kill certain insects.
What do you mean by Biopiracy?
Some organizations and multinational companies exploit and patent biological resources of other nation without proper authorisation is called Biopiracy.
What is role of Bacillus thuringiensis?
Bacillus thuringiensis produces cry protein which is lethal to pest.
What is gene therapy?
Technique of genetic engineering to replace a family gene by a normal healthy functional gene.
What is Vaccines?
Vaccines are preparation of extract of dead which on evoculation into a healthy person provide temporary or permanent active or passive immunity by inducing antibody formation.
Name same antibiotics produced by Microorganisms?
Penicillin, Neomycin, Streptomycin, Tetracyclines. Terramycin, Erythromycin etc.
What is isolation of genetic material?
Finding out of DNA molecule from the desired cells with Lysozyme or Cellulase or Chitinase.
What is difference between transformation and transduction?
- Transformation – Change in the genetic constitution of an organism by picking up genes present in the medium.
- Transduction – Change in genetic constitution of an organism through reproduction with Virus.
What is function of Restriction endonuclease and Ligase?
- Restriction Endonuclease – It cleave DNA duplex at any point except end.
- Ligase – Bind Vector DNA segment with the DNA of desired cells.
Give the name of same antibiotics.
Penicillin, Neomycin, Streptomycin, Tetracyclines, Terramycin.
Give the name of four antibiotics producing organisms.
- Penicillium notatum
- Penicillium chrysogenum
- Streptomyces noursei
- Streptomyces griseus.
What is difference between Cybrid and Hybrid?
Cybrid – One nucleus of one cells persist and cytoplasm of both cell fused.
Hybrid – Nucleus of both cells with cytoplasm fused.
What is retrovirus?
It is RNA Containing virus showing reverse transcription, i.e. HIV Virus.
What is DNA Probe?
It is single stranded piece of DNA.
What do you mean by the term in Vitro and in Vivo experiments?
In Vitro – Experiment conducted in lab.
In Vivo – Experiment conducted in natural condition.
How a recombinant DNA is formed by the help of genetic engineering?
It is formed by recombinant DNA technology.
What is DNA Primer?
It is the synthetic small segment of DNA which is complementary to the specific segment of a DNA.
Give the name of natural polymer which is extracted from seaweed (Sea Algae).
DNA and proteins are macromolecules which among the two is bigger and how?
DNA is bigger than proteins because protein is produced by coding strand of DNA.
What is Symbiosis? Name two types of Symbiosis.
It is relationship between two living individuals of different species in which either both species are benefitted.
- Mutualism – Both benefitted
- Commensalism – One benefitted but other neither benefitted nor harmed.
Name the types of ecological pyramid.
- Pyramid of number
- Pyramid of Biomass
- Pyramid of Energy