22339 + Interview Questions in Biology in Class 11 Page 260 InterviewSolution

12951.	Question : Polytrichum is a
Answer» LIVER wort Moss Kelp Horn wort Answer :B

Discussion

12952.	Question : Polytene chromosomes were discovered by
Answer» Muller Hofmeister Balbiani Waldeyer ANSWER :C

Discussion

12953.	Question : Polytene chromosomes are observed in____of Drosophila.
Answer» ENDOCRINE GLAND Gall bladder SALIVARY gland Exocrine gland Solution :Salivary gland

Discussion

12954.	Question : Polysome contains
Answer» ONE m-RNA with one paladae granule One m-RNA with MANY lysosomes One m-RNA with many Ergosomes Many m-RNA with many lysosomes. Answer :C

Discussion

12955.	Question : Polysome refers to :
Answer» RIBOSOME in the cytoplasm cluster of ribosomes SINGLE unit of ribosome associated with ER ribosomes PRESENT in the NUCLEOLUS SOLUTION :cluster of ribosomes

Discussion

12956.	Question : Define:- Polysome
Answer» SOLUTION :One or more ribosome are attached to any one MRNA and FORM a chain it is called polysome.

Discussion

12957.	Question : Polysiphonia shows haplontic/haplo-diplontic life cycle.
Answer» SOLUTION :haplo-diplontic

Discussion

12958.	Question : Polyp produce medusae sexually/asexually.
Answer» SOLUTION :ASEXUALLY

Discussion

12959.	Question : Polyp and .............. are two forms of Phylum Cnidaria.
Answer» ANSWER :MEDUSA

Discussion

12960.	Question : Polyp phase is absent in …………………. .
Answer» PHYSALIA Obselia HYDRA AURELIA SOLUTION :Aurelia

Discussion

12961.	Question : Polymorphic cnidarian in the following is
Answer» HYDRA OBELIA Metridium Halistemma ANSWER :D

Discussion

12962.	Question : Polyderm is found in the roots and underground stems of family is………………….
Answer» Rosaceae FABACEAE SOLANACEAE Lilliaceae Solution :Rosaceae

Discussion

12963.	Question : Polydermis found in …………..
Answer» STEM ROOTS UNDERGROUNDSTEM Both (a) and (C ) ANSWER :D

Discussion

12964.	Question : Polyarch xylem condition is found in
Answer» DICOT ROOT Dicot STEM MONOCOT root Monocot stem Answer :C

Discussion

12965.	Question : Polluted water bodies have usually very high abundance of plants like Nostoc and Oscillitoria. Give reasons.
Answer» Solution :Some cynobacteria or blue green algae like Nostoc and Oscillitoria can TOLERATE adverse conditions including POLLUTANTS very well as compared to other aquatic plants. This is due to the PRESENCE of mucilage covering, resistant proteins and absence of SAP vacuoles. They release large quantity of spores which are always remain present in AIR. These organisms get plenty of nutrients in polluted water. Hence, they often bloom in such conditions and are found in abundance in polluted water.

Discussion

12966.	Question :Pollination is characteristic of
Answer» BRYOPHYTES and ANGIOSPERMS PTERIDOPHYTES and Angiosperms Angiosperms and Gymnosperms Angiosperms and Fungi Answer :C

Discussion

12967.	Question : Pollination in water hyacinth and water lily is brought about by the agency of
Answer» water insects or wind birds bats ANSWER :B

Discussion

12968.	Question : Pollination in Vallisneria is by
Answer» wind animals insects water ANSWER :D

Discussion

12969.	Question : Pollination in gymnosperms is ........... and takes place by the agency of ..........
Answer» SOLUTION :ANEMOPHILOUS WIND

Discussion

12970.	Question : Pollination in Cedrus/Pinus/Cycas is
Answer» HYDROPHILOUS Ornithophilous Zoophilous ANEMOPHILOUS ANSWER :D

Discussion

12971.	Question : Pollination by snail and slug is known as
Answer» ornithophilous chiropterophilous entomophilous melacophilous ANSWER :B

Discussion

12972.	Question : Pollen tablets are available in the market for
Answer» in VITRO fertilization breeding PROGRAMMES SUPPLEMENTING food ex SITU conservation Answer :C

Discussion

12973.	Question :Pollen tablets are available in the market for :
Answer» EX SITU conservation In vitro fertilization Breeding programmes Supplementing FOOD ANSWER :D

Discussion

12974.	Question : Pollen grains in Pinus, develops inside the
Answer» POLLEN chamber Microsporangium Microgametangium Anther Solution :Pollen grains in Pinus, DEVELOPS INSIDE the microsporangium.

Discussion

12975.	Question :Pollen grains are shed at which stage?
Answer» 2 CELLED 3 celled usually at 2 celled, but SOMETIMES at 3 celled single celled stage Answer :C

Discussion

12976.	Question : Pollen grain represents one of the following
Answer» ZYGOTE Microspore FEMALE gametophyte Male gametophyte Answer :B

Discussion

12977.	Question : Pollen grain is
Answer» reduced SPOROPHYTE reduced male sporophyte reduced male GAMETOPHYTE reduced FEMALE gametophyte Answer :C

Discussion

12978.	Question : Pollen germination requires ……………………………………………… mineral.
Answer» Copper Molybdenum CHLORINE BORON Solution :Boron

Discussion

12979.	Question : Pollen differs from pollinium. How?
Answer» Solution :Pollen are microspores which produces MALE gametes, whereas POLLINIUM REFERS to the single mass of FUSED pollen grains.

Discussion

12980.	Question :Polio is transmitted by
Answer» Inoculation Contamination CONTAMINATED BLOOD transfusions MOSQUITO bite Answer :B

Discussion

12981.	Question : Poisons like cyanide inhibit Na^(+) efflux and K^(+) influx during cellular transport. This inhibitory effect is reversed by an injection of ATP. This demonstrates that
Answer» ATP is the carrier PROTEIN in the transport SYSTEM `Na^(+)_K^(+)` exchange pump operates in the cell ATP is hydrolysed by ATP ase to release energy Energy for `Na^(+)_K^(+)` exchange pump COMES from ATP Answer :A

Discussion

12982.	Question : What are the uses of molecular taxonomy?
Answer» Solution :1. Molecular taxonomy helps in ESTABLISHING the relationship of different plant groups at DNA level. 2. It UNLOCKS the TREASURE chest of information on EVOLUTIONARY HISTORY of organisms.

Discussion

12983.	Question : Point out the steps involved in sexual reproduction of fungi.
Answer» Solution :Sexual reproduction in FUNGI INCLUDES three steps : 1. Fusion of two PROTOPLASTS (PLASMOGAMY) 2. Fusion of nuclei (karyogamy) and 3. Production of haploid spores through meiosis.

Discussion

12984.	Question : What is the significance of photorespiration?
Answer» SOLUTION :1. Glycineand Serine synthesised duringthis process areprecursors of many BIOMOLECULES ikechlorophyll, protein , nucleotides . 2. It consumes excess`NADH+H^(+)` GENERATED . 3 . Glycolate protects cellsfromPhoto OXIDATION .

Discussion

12985.	Question : What is the significance of C_(4) cycle?
Answer» Solution :SINGNIFICANCE of `C_(4)`CYCLE. 1. Plantshaving `C_(4)`cycleare mainly of tropical and SUB - tropicalregions and areableto survivein environmentwith low `CO_(2)`CONCENTRATION . 2 . `C_(4)`plantsare partiallyadapted to droughtconditions. 3. Oxygenhas noinhibitory effect on `C_(4)`cyclesincePEP CARBOXYLASE in insenitiveto `O_(2)`. 4 . Dueto absenceof photorespiration`CO_(2)`, CompensationPoint for `C_(4)`is lowerthan that of`C_(3)`plants .

Discussion

12986.	Question : What is the significance of Kreb's cycle ?
Answer» Solution :Significance of KREBS cycle : 1. TCA cycle is to provide energy in the form of ATP for metabolism in plants. 2. It provides carbon skelton or raw material for various anabolic processes. 3. Many intermediates of TCA cycle are further metabolised to produce amino acids, proteins and nucleic acids. 4. Succinyl CoA is raw material for formation of chlorophylls, cytochrome, phytochrome and other pyrrole substances. 5. `ALPHA`- ketoglutatarate and oxaloacetate undergo reductive amination and produce amino acids. 6. It ACTS as metabolic SINK which plays a central role in intermediary metabolism.

Discussion

12987.	Question : Point out the percentage of water in human cell & a plant cell.
Answer» Water MAKES upto 70% of human cell and upto 95% of mass of a PLANT cell. Solution :Water makes upto 70% of human cell and upto 95% of mass of a plant cell.

Discussion

12988.	Question : Point out the reasons responsible for the arresting of the cell in G_(1) Phase.
Answer» SOLUTION :Cells are arrested in `G_(1) ` DUE to * Nutrient deprivation. * Lack of growth factors or density dependennt inhibition. * Undergo METABOLIC CHANGES and enter into `G_(0)` state.

Discussion

12989.	Question : Point out the odd one
Answer» Prolactin Vasopressin Corticotropin Noradrenaline Answer :D

Discussion

12990.	Question : What is the importance of photoperiodism ?
Answer» Solution :Importance of PHOTOPERIODISM 1. The knowledge of photoperiodism plays an important ROLE in hybridisation EXPERIMENTS. 2. Photoperiodism is an excellent example of physiological pre-conditioning that is USING an external factor to induce physiological CHANGES in the plant.

Discussion

12991.	Question : Write theimportance of direct oxidative pathway .
Answer» SOLUTION :1. HMP shunt is associated with the generation of two important PRODUCTS, NADPH and PENTOSE sugars, which play a vital role in anabolic reactions. 2. Coenzyme NADPH generated is used for reductive biosynthesis and counter damaging the effects of oxygen free RADICALS. 3. Ribose - 5 - phosphate and its derivatives are used in the synthesis of DNA, RNA, ATP, `NAD^+, FAD` and Coenzyme A. 4. Erythrose is used for synthesis of antiocyanin, LIGNIN and other aromatic compounds.

Discussion

12992.	Question : Point out the general characters of Gymnospermns.
Answer» Solution :General characteristic features: (i) Most of the gymnosperms are evergreen woody trees or shrubs. Some are lianas (Gnetum) (ii) The plant body is sporophyte and is differentiated into root, stem and leaves. (iii) A well developed Tap root system is present. Coralloid Roots of Cycas have symbiotic association with blue green algae. In Pinus the roots have mycorrhizae. (iv) The stem is aerial, erect and BRANCHED or UNBRANCHED (Cycas) with leaf scars. (v) In conifers two types of branches namely branches of limited growth (Dwarf shoor) and Branches of unlimited growth (Long shoot) is present. (vi) Leaves are dimorphic, foliage and scale leaves are present. Foliage leaves are green, photosynthetic and borne on branches of limited growth. They show xerophytic features. (vii) The xylem consists of tracheids but in Gnetum and Ephedra vessels are present. (vii) Secondary growth is present. The wood may be Manoxylic (Porous, soft, more PARENCHYMA with wide medullary ray -Cycas) or Pycnoxylic (compact with narrow medullary ray-Pinus). (ix) They are Heterosporous. The plant may be monoecious (Pimus) or dioecious (Cycas). (x)Microsporangia and Megasporangia are produced on Microsporophyll and Megasporophyll respectively. (xi) MALE and female cones are produced. (xii) Anemophilous pollination is present. (xiii) Fertilization is siphonogamous and pollen tube helps in the TRANSFER of male nuclei. (xiv) Sporne (1965) classified gymnosperms into 3 classes, 9 orders and 31 families. The classes include (i) Cycadospsida (ii) Coniferopsida (iii) Gnetopsida.

Discussion

12993.	Question : Write the functions of epidermal tissue system.
Answer» Solution :Functions of Epidermal Tissue System : 1. This system in the shoot checks excessive loss of water due to the presence of cuticle. 2. Epidermis protects the underlying tissues. 3. Stomata is involved in transpiration and GASEOUS EXCHANGE. 4. Trichomes are also helpful in the dispersal of seeds and fruits, and provide protention against animals. 5. Prickles also provide protection against animals and they also CHECK excessive transpiration. 6. In some rose plants they also help in CLIMBING. 7. Glandular hairs repel herbivorous animals.

Discussion

12994.	Question : Point out the differences in the anatomy of leaf of peepal (Ficus religiosa) and maize (Zea mays). Draw the diagrams and label the differences.
Answer» SOLUTION :

Discussion

12995.	Question : Point out the characters of Early angiosperm according to APG Classification,
Answer» Solution :1. Seeds always with two cotyledons. 2. Presence of ethereal oils. 3. Leaves are always simple net-veined 4. Each floral whorls with many parts 5. Perianth USUALLY spirally arranged or parts in threes 6. Stamens with broad filaments 7. ANTHERS tetrasporangiate 8. Pollen monosulcate 9. Nectaries are rare 10. Carpels usually free and 11. Embryo very SMALL

Discussion

12996.	Question : Write any two demerits of Five Kingdom classification.
Answer» Solution :(a) The kingdom Monera and Protista accommodate both autotrophic and heterotrophic organisms, cell WALL lacking and cell wall lacking and cell wall bearing organisms THUS MAKING these two group more heterogeneous. (b) Viruses were not included in the SYSTEM.

Discussion

12997.	Question : List out the bioenergetics of light reaction.
Answer» Solution :Bio energetics of lightreaction : To release ONE electron form pigmentsystem it requires two QUANTA of light . Onequantumis usedfor transportof electronfrom water to PS I. Secondquantum is usedfor transportof electron from PSI to `NADP^(+)`. Two electrons are requried to GENERATE on `NADPH + H^(+)`. DuringNon - Cyclic electron transporttwo `NADPH+ H^(+)` are producedand it requires 4 electrons. Transportaionof 4 electrons requires 8 quanta of light .

Discussion

12998.	Question : Point out the angiospermic families that do not possess xylem vessels.
Answer» SOLUTION :Winteraceae, Tetracentraceae and Trochdendraceae are the vesselless angiospermic FAMILIES.

Discussion

12999.	Question : What are the aims of chemotaxonomy?
Answer» Solution :1. To develop taxonomic CHARACTERS which MAY improve existing system of plant classification 2. To improve present DAY knowledge of PHYLOGENY of plants.

Discussion

13000.	Question : Point out any two cell-types which remain G_(0) Phase.
Answer» SOLUTION :Mature NEURONS and SKELETAL MUSCLE cells.

Discussion

Explore topic-wise InterviewSolutions in .

Question : Polytrichum is a

Question : Polytene chromosomes were discovered by

Question : Polytene chromosomes are observed in____of Drosophila.

Question : Polysome contains

Question : Polysome refers to :

Question : Define:- Polysome

Question : Polysiphonia shows haplontic/haplo-diplontic life cycle.

Question : Polyp produce medusae sexually/asexually.

Question : Polyp and .............. are two forms of Phylum Cnidaria.

Question : Polyp phase is absent in …………………. .

Question : Polymorphic cnidarian in the following is

Question : Polyderm is found in the roots and underground stems of family is………………….

Question : Polydermis found in …………..

Question : Polyarch xylem condition is found in

Question : Polluted water bodies have usually very high abundance of plants like Nostoc and Oscillitoria. Give reasons.

Question :Pollination is characteristic of

Question : Pollination in water hyacinth and water lily is brought about by the agency of

Question : Pollination in Vallisneria is by

Question : Pollination in gymnosperms is ........... and takes place by the agency of ..........

Question : Pollination in Cedrus/Pinus/Cycas is

Question : Pollination by snail and slug is known as

Question : Pollen tablets are available in the market for

Question :Pollen tablets are available in the market for :

Question : Pollen grains in Pinus, develops inside the

Question :Pollen grains are shed at which stage?

Question : Pollen grain represents one of the following

Question : Pollen grain is

Question : Pollen germination requires ……………………………………………… mineral.

Question : Pollen differs from pollinium. How?

Question :Polio is transmitted by

Question : Poisons like cyanide inhibit Na^(+) efflux and K^(+) influx during cellular transport. This inhibitory effect is reversed by an injection of ATP. This demonstrates that

Question : What are the uses of molecular taxonomy?

Question : Point out the steps involved in sexual reproduction of fungi.

Question : What is the significance of photorespiration?

Question : What is the significance of C_(4) cycle?

Question : What is the significance of Kreb's cycle ?

Question : Point out the percentage of water in human cell & a plant cell.

Question : Point out the reasons responsible for the arresting of the cell in G_(1) Phase.

Question : Point out the odd one

Question : What is the importance of photoperiodism ?

Question : Write theimportance of direct oxidative pathway .

Question : Point out the general characters of Gymnospermns.

Question : Write the functions of epidermal tissue system.

Question : Point out the differences in the anatomy of leaf of peepal (Ficus religiosa) and maize (Zea mays). Draw the diagrams and label the differences.

Question : Point out the characters of Early angiosperm according to APG Classification,

Question : Write any two demerits of Five Kingdom classification.

Question : List out the bioenergetics of light reaction.

Question : Point out the angiospermic families that do not possess xylem vessels.

Question : What are the aims of chemotaxonomy?

Question : Point out any two cell-types which remain G_(0) Phase.