List of top Biology Questions

F. Skoog observed that callus proliferated from the internodal segments of tobacco stem when auxins was supplied with one of the following except :

Ligases is a class of enzymes responsible for catalysing the linking together of two compounds.Which of the following bonds is not catalysed by it?

Match List-I with List-II:

List-I	List-II
A. Metacentric chromosome	I. Chromosome has a terminal centromere
B. Sub-metacentric chromosome	II. Middle centromere forming two equal arms of chromosome
C. Acrocentric chromosome	III. Centromere is slightly away from the middle of chromosome resulting into two unequal arms
D. Telocentric chromosome	IV. Centromere is situated close to its end forming one extremely short and one very long arm

Choose the correct answer from the options given below:

Recombination between homologous chromosomes is completed by the end of

Given below are two statements:
Statement I: Failure of segregation of chromatids during cell cycle resulting in the gain or loss of whole set of chromosome in an organism is known as aneuploidy.
Statement II: Failure of cytokinesis after anaphase stage of cell division results in the gain or loss of a chromosome is called polyploidy.
In the light of the above statements, choose the correct answer from the options given below:

Match List-I with List-II:

List-I	List-II
A. Histones	III. Positively charged basic proteins
B. Nucleosome	IV. DNA wrapped around histone octamer
C. Euchromatin	I. Loosely packed chromatin
D. Heterochromatin	II. Densely packed Chromatin

Choose the correct answer from the options given below:

Given below are two statements:
Statement I: In eukaryotes there are three RNA polymerases in the nucleus in addition to the RNA polymerase found in the organelles.
Statement II: All the three RNA polymerases in eukaryotic nucleus have different roles.
In the light of the above statements, choose the correct answer from the options given below:

Which of the following are correct about cellular respiration?
A. Cellular respiration is the breaking of C-C bonds of complex organic molecules by oxidation.
B. The entire cellular respiration takes place in Mitochondria.
C. Fermentation takes place under anaerobic condition in germinating seeds.
D. The fate of pyruvate formed during glycolysis depends on the type of organism also.
E. Water is formed during respiration as a result of O2 accepting electrons and getting reduced
Choose the correct answer from the options given below:

Cryopreservation technique is used for

Match List-I with List-II:

List-I	List-II
A. ETS Complex I	I. NADH Dehydrogenase
B. ETS Complex II	IV. Succinate Dehydrogenase
C. ETS Complex III	II. Cytochrome bc1
D. ETS Complex IV	III. Cytochrome C oxidase

Choose the correct answer from the options given below:

Match List-I with List-II:

List-I	List-II
A. Genetically engineered Human Insulin	I. Gene therapy
B. GM Cotton	II. E. coli
C. ADA Deficiency	III. Antigen-antibody interaction
D. ELISA	IV. Bacillus thuringiensis

Choose the correct answer from the options given below:

Match List-I with List-II:

List-I	List-II
A. Abscisic acid	I. Promotes female flowers in cucumber
B. Ethylene	II. Helps seeds to withstand desiccation
C. Gibberellin	III. Helps in nutrient mobilisation
D. Cytokinin	IV. Promotes bolting in beet, cabbage etc

Choose the correct answer from the options given below:

Mesosome in a cell is a

Which of the following helps in maintenance of the pressure gradient in sieve tubes?

Match List-I with List-II :

List-I	List-II
A. China rose	I. Free central
B. Mustard	II. Basal
C. Primrose	III. Axile
D. Marigold	IV. Parietal

Choose the correct answer from the options given below

Match List-I with List-II :

List-I	List-II
A. Vexillary aestivation	I. Brinjal
B. Epipetalous stamens	II. Peach
C. Epiphyllous stamens	III. Pea
D. Perigynous flower	IV. Lily

Choose the correct answer from the options given below

Which of the following is a nucleotide?

Given below are two statements regarding RNA polymerase in prokaryotes.
Statement I : In prokaryotes, RNA polymerase is capable of catalysing the process of elongation during transcription.
Statement II : RNA polymerase associate transiently with ‘Rho’ factor to initiate transcription.
In the light of the above statements, choose the correct answer from the options given below :

Which of the following is the correct match?

Identify the incorrect pair :

Pollen grains remain preserved as fossils due to the presence of

Given below are two statements:
Statement I : The Indian Government has set up GEAC, which will make decisions regarding the validity of GM research.
Statement II : Biopiracy is the term used to refer to the use of bio-resources by native people.
In the light of the above statements, choose the correct answer from the options given below :

Which one of the following is not included under in-situ conservation?

Which one of the following is not found in Gymnosperms?

Which part of the ovule stores reserve food materials?