24277 + Interview Questions in Biology in Class 12 Page 181 InterviewSolution

9001.	Question : Rotenone is obtained from
Answer» LEAVES of Nicotiana Roots of DERRIS elliptica Leaves of CHRYSANTHEMUM cinerarifolium Roots of Rouwolffia serpentina Answer :B

Discussion

9002.	Question : Rotenone is:
Answer» bionisecticide juvenile hormone bioherbicide commonly USED biofertilizer Answer :A

Discussion

9003.	Question : Rosie' a transgenic cow is known to produce a type of milk which has all the following characteristics except:
Answer» protein CONTENT of 2.4 gm/litre has human α-lactalbumin more BALANCED diet than normal COW milk for babies was produced for the FIRST time in YEAR 2001 Answer :D

Discussion

9004.	Question : Rosie is the ……..
Answer» TRANSGENIC Cow Transgenic Vaccine Transgenic PLANT Transgenic DISEASE controller Answer :A

Discussion

9005.	Question : Rose plants produce large, attractive bisexual flowers but they seldom produce fruits. On the other hand a tomato plant produces plenty of fruits though they have small flowers. Analyse the reasons for failure of fruit formation in rose.
Answer» Solution :FAILURE of FRUIT formation in rose may be due to several reasons. Some of the LIKELY reasons are (a) Rose plants may not produce viable POLLEN. (b) Rose plants may not have functional egg. (c ) Rose plants may have abortive ovules. (d) Being hybrids, the meiotic process may be abnormal resulting in non - viable gametes. (E ) Self - incompatibility. (f) There may be internal barriers for pollen tube growth and / or fertillisation.

Discussion

9006.	Question : Roquefort cheese is made by
Answer» bacteria fungi nematode mycoplasma Answer :B

Discussion

9007.	Question : Roots play insignificant role in absorption of water in
Answer» Wheat Sunflower Pistia Pea Answer :C

Discussion

9008.	Question : Roots of higher plants develop mycorrhiza for obtaining
Answer» SULPHATES Nitrogen Phosphates All of the above ANSWER :D

Discussion

9009.	Question : Roots arising from lower nodes of stem to support main axis and enter obliquely into the soil are referred as
Answer» Haustorial roots Epiphyllous roots Stilt roots Contractile roots Answer :C

Discussion

9010.	Question : Roots can absorb minerals from the soil when they are in:
Answer» SOLID state Liquid state Ionic state Gaseous state Answer :C

Discussion

9011.	Question : Roots are used in vegetative propagation of
Answer» Ginger Chrysanthemum Sweet potato Potato Answer :C

Discussion

9012.	Question : Root branches are :
Answer» ENDOGENOUS Exogenous Superficial Outgrowths Answer :A

Discussion

9013.	Question : Root pressure is usually because of
Answer» INCREASE in transpiration Active absorption Low OSMOTIC POTENTIAL in soil Passive absorption Answer :B

Discussion

9014.	Question : Root pressure does not take an active part in the ascent of sap because it is
Answer» water can rise even in the absence of root pressure It is OBSERVED during SPRING or RAINY season only never FOUND to exist in gymnosperm All of the above Answer :D

Discussion

9015.	Question : Root pressure is higher when:
Answer» TRANSPIRATION is very LOW and ABSORPTION is low transpiration is very HIGH and absorption is very high transpiration is low and absorption is high transpiration is high and absorption is low Answer :A

Discussion

9016.	Question : Root pressure develops during
Answer» NIGHT TIME EARLY mornings Mid afternoons 1 and 2 Answer :D

Discussion

9017.	Question : Root nodules with Rhizobium and without leghaemoglobin are found in
Answer» Glycine Parasponia Alnus Gunnera Answer :B

Discussion

9018.	Question : Root nodules in Alnu is formed by
Answer» Rhizobium Azospirillum Frankia Clostridium Answer :C

Discussion

9019.	Question : Root is positively geotropic whereas stem is positively_____
Answer» ANSWER :phototropic

Discussion

9020.	Question : Root hairs cells under ordinary conditions typically have water potential in the range of
Answer» 1 to 4 atmospheres 1 to -4 atmospheres 1 to 2 atmospheres -1 to 2 atmospheres Answer :B

Discussion

9021.	Question : Root hairs are present in
Answer» ZONE of elongation Zone of MERISTEMATIC ACTIVITY ROOT cap Zone of maturation Answer :D

Discussion

9022.	Question : Root hairs are more in number in
Answer» Hydrophytes Xerophytes Mesophytes Lithophytes Answer :B

Discussion

9023.	Question : Root cells of wheat has 2n = 42 chromosomes. Which one of the following is the basic chromosome number of Wheat?
Answer» 42 21 7 14 Answer :C

Discussion

9024.	Question : Root-fungal association is called:
Answer» Lichen MYCORRHIZA PARASITISM AMENSALISM ANSWER :B

Discussion

9025.	Question : Root cell in which the movement is always symplastic is
Answer» ROOT hair Endodermal cell Root xylem Pericycle Answer :C

Discussion

9026.	Question : Root cap is absent in
Answer» XEROPHYTES Hydrophytes Mesophytes HALOPHYTES ANSWER :B

Discussion

9027.	Question : Root apical meristerm (root apex) appears cup-shaped (roughly hemispherical) due to the presence of
Answer» root cap root hairs QUIESCENT CENTRE NONE of these ANSWER :C

Discussion

9028.	Question : Root apical meristem cells are distinct forn other root is cells , beacause of their:
Answer» THICK CELL walls Tripol nuclei Enlarged WATER vacuoles Smaller size Answer :D

Discussion

9029.	Question : rolling grass is
Answer» agropyron ammophila poa all the above. Answer :d

Discussion

9030.	Question : Role of Y-chromosome is crucial for maleness - Justify.
Answer» Solution :Current analysis of Y chromosomes has REVEALED numerous genes and regions with potential genetic function, some genes with or without homologous counterparts are seen on the X. Present at both ends of the Y CHROMOSOME are the pseudoautosomal regions (PARs) that are similar with regions on the X chromosome which SYNAPSE and recombine during meiosis. The remaining 95% of the Y chromosome is referred as the Non-combining Region of the Y (NRY). The NRY is divided equally into functional genes ( euchromatic) and non-functional genes (heterochromatic). Within the euchromatin regions, is a gene CALLED Sex determining region Y (SRY). In humans, absence of Y chromosome invitably leads to female development and this SRY gene is ABSENT in X chromosome. The gene product of SRY is the testes determining factor (TDF) present in the adult male testis.

Discussion

9031.	Question : Role of oxygen in the regulation of respiratory rhythm is quite insignificant. (True/false)
Answer» ANSWER :1

Discussion

9032.	Question : Role of PCR in phylogenetics. Explain.
Answer» Solution :The differences in the genomes of two different organisms can be STUDIED by PCR. PCR is very important in the study of EVOLUTIONS, more specifically phylogeneties. As a technique which can amplify even MINUTE quantities of DNA from any source, like HAIR, mumnmitfied TISSUES, bones or any fossilized materials.

Discussion

9033.	Question : Role of nucleus in morphological differentiation was discovered in
Answer» ACETABULARIA by Hammerling Drosophila by Morgan Neurospora by Morgan Garden PEA by BEADLE and Tatum Answer :A

Discussion

9034.	Question : “Role of hormones in spermatogenesis” - comment on the statement.
Answer» Solution :Spermatogenesis starts at the age of puberty and is initiated due to the INCREASE in the release of Gonadotropin Releasing Hormone (GnRH) by the HYPOTHALAMUS. GnRH acts on the anterior pituitary gland and stimulates the secretion of two gonadotropins namely Follicle Stimulating Hormone (FSH) and Lutenizing Hormone (LH). FSH stimulates testicular growth and enhances the production of Androgen Binding Protein (ABP) by the Sertoli CELLS and helps in the process of spermiogenesis. LH acts on the LEYDIG cells and stimulates the SYNTHESIS of testosterone which in turn stimulates the process of spermatogenesis.

Discussion

9035.	Question : Role of bacteria in retting of fibres is the hydeoklysis of
Answer» CELLULOSE of the cell WALLS of the fibres lignin of the cellothese WALL pactic substances that binads the cells together Answer :D

Discussion

9036.	Question : Role of DNA in heredity was discovered for the first time through experiments involving:
Answer» Transformation using E. coli Transduction involving bacteriophage The use of ENZYMES protease and nuclease Transformation using heat killed virulent and LIVING nonvirulent S. pneumoniae Answer :D

Discussion

9037.	Question :Role of Angiotensin II is
Answer» DECREASES the GFR Enhances REABSORPTION of `Na^+` STIMULATES the SECRETION of ANP Decreases BP Answer :B

Discussion

9038.	Question : Rocky mountain revolution took place between:
Answer» PALAEOZOIC and MESOZOIC era Archaeozoic and PROTEROZOIC era Mesozoic and coenozoic era Proterozoic and palaeozoic era Answer :C

Discussion

9039.	Question : Robinson's ester is
Answer» GLUCOSE 1, 6-diphosphate glucose-6-phosphate fructose-6-phosphate none of the above Answer :D

Discussion

9040.	Question : Robert Constanza and his colleagues put price tags on nature's life-support services. Price tag of US $33 trillion a year. Which is the most price tagged ecosystem service in nature?
Answer» Solution :Soil creation is the most PRIZE TAGGED ECOSYSTEM SERVICE.

Discussion

9041.	Question : Robert Constanza and his colleagues put price tags on nature's life-support services. Price tag of US $33 trillion a year. What is the meant by ecosystem services? Give example.
Answer» Solution :The PRODUCT ECOSYSTEM process 1. GENERATE FERTILE soil. 2) POLLINATE crops

Discussion

9042.	Question : Roan colour in cattle is dueto what condition of genes controlling red and white colour ?
Answer» ANSWER :Co-dominance

Discussion

9043.	Question : RNAi takes place in all eukaryotic organisms as a method of
Answer» CELLULAR defense DNA PROOF READING TRANSCRIPTION Translation Answer :A

Discussion

9044.	Question : RNAi was first introduced in tobacco plants to restrict the infection of a nematode worm………….
Answer» ANSWER :Meloidegyne incognitia

Discussion

9045.	Question : RNAi technology was discovered in
Answer» NICOTIANA tobaccum CAENORHABDITIS elegans Meloidogyne incognita Bacillus thuringiensis Answer :B

Discussion

9046.	Question : RNA viruses mutate and evolve faster then other viruses. Why?
Answer» Solution :OH GROUP is preesent of RNA, which is a REACTIVE group so it is UNSTABLE and mutate faster.

Discussion

9047.	Question : RNA transcribed from the following segment of DNA is 3. - ATGCATGCATGC - 5. Template strand 5. - TACGTACGTACG - 3. Coding strand
Answer» 3. - ATGCATGCATGC - 5. 5. - TACGTACGTACG - 3. 3. - AUGCAUGCAUGC - 5. 5 - UACGUACGUACG - 3. Answer :D

Discussion

9048.	Question : RNA processing occurs in
Answer» bacteria viruses fungi viroids Answer :C

Discussion

9049.	Question : RNA primer is a short segment of ______.
Answer» SOLUTION :RNA NUCLEOTIDES

Discussion

9050.	Question : RNA polymerase which is on the promoter, moves to the structural genes to transcribe them. However, it happens when
Answer» there is no repressor on the operator there is repressor on the operator inducer binds to structural genes RNA POLYMERASE shifts FIRST to REGULATOR gene ANSWER :A

Discussion

Explore topic-wise InterviewSolutions in .

Question : Rotenone is obtained from

Question : Rotenone is:

Question : Rosie' a transgenic cow is known to produce a type of milk which has all the following characteristics except:

Question : Rosie is the ……..

Question : Rose plants produce large, attractive bisexual flowers but they seldom produce fruits. On the other hand a tomato plant produces plenty of fruits though they have small flowers. Analyse the reasons for failure of fruit formation in rose.

Question : Roquefort cheese is made by

Question : Roots play insignificant role in absorption of water in

Question : Roots of higher plants develop mycorrhiza for obtaining

Question : Roots arising from lower nodes of stem to support main axis and enter obliquely into the soil are referred as

Question : Roots can absorb minerals from the soil when they are in:

Question : Roots are used in vegetative propagation of

Question : Root branches are :

Question : Root pressure is usually because of

Question : Root pressure does not take an active part in the ascent of sap because it is

Question : Root pressure is higher when:

Question : Root pressure develops during

Question : Root nodules with Rhizobium and without leghaemoglobin are found in

Question : Root nodules in Alnu is formed by

Question : Root is positively geotropic whereas stem is positively_____

Question : Root hairs cells under ordinary conditions typically have water potential in the range of

Question : Root hairs are present in

Question : Root hairs are more in number in

Question : Root cells of wheat has 2n = 42 chromosomes. Which one of the following is the basic chromosome number of Wheat?

Question : Root-fungal association is called:

Question : Root cell in which the movement is always symplastic is

Question : Root cap is absent in

Question : Root apical meristerm (root apex) appears cup-shaped (roughly hemispherical) due to the presence of

Question : Root apical meristem cells are distinct forn other root is cells , beacause of their:

Question : rolling grass is

Question : Role of Y-chromosome is crucial for maleness - Justify.

Question : Role of oxygen in the regulation of respiratory rhythm is quite insignificant. (True/false)

Question : Role of PCR in phylogenetics. Explain.

Question : Role of nucleus in morphological differentiation was discovered in

Question : “Role of hormones in spermatogenesis” - comment on the statement.

Question : Role of bacteria in retting of fibres is the hydeoklysis of

Question : Role of DNA in heredity was discovered for the first time through experiments involving:

Question :Role of Angiotensin II is

Question : Rocky mountain revolution took place between:

Question : Robinson's ester is

Question : Robert Constanza and his colleagues put price tags on nature's life-support services. Price tag of US $33 trillion a year. Which is the most price tagged ecosystem service in nature?

Question : Robert Constanza and his colleagues put price tags on nature's life-support services. Price tag of US $33 trillion a year. What is the meant by ecosystem services? Give example.

Question : Roan colour in cattle is dueto what condition of genes controlling red and white colour ?

Question : RNAi takes place in all eukaryotic organisms as a method of

Question : RNAi was first introduced in tobacco plants to restrict the infection of a nematode worm………….

Question : RNAi technology was discovered in

Question : RNA viruses mutate and evolve faster then other viruses. Why?

Question : RNA transcribed from the following segment of DNA is 3. - ATGCATGCATGC - 5. Template strand 5. - TACGTACGTACG - 3. Coding strand

Question : RNA processing occurs in

Question : RNA primer is a short segment of ______.

Question : RNA polymerase which is on the promoter, moves to the structural genes to transcribe them. However, it happens when