24277 + Interview Questions in Biology in Class 12 Page 208 InterviewSolution

10351.	Question : Placenta acts as an endocrine gland. Justify the statement
Answer» Solution :PLACENTA synthesises hCG, (human chorionic GONADOTROPIN), hPL (human PLACENTAL lactogen estrogen), progesterone ETC.

Discussion

10352.	Question : Placenta acts as an endocrine gland. Write any other two functions of placenta.
Answer» Solution :Placenta ACTS as a BARRIER between the FOETUS and mother It HELPS in SUPPLY of `O_2` and nutriens to the embryo.

Discussion

10353.	Question : Plague and malaria are caused by……..and ……..repectively.
Answer» BACTERIA and virus Fungi and protozoa Bacteria and protozoan Fungi and bacteria Answer :A::B::C::D

Discussion

10354.	Question : placentation is axile in the overy of
Answer» CHINA ROSE SUNFLOWER pea Ranunculus ANSWER :A

Discussion

10355.	Question : Placentation inTomato and Lemon is
Answer» Perietal Marginal Free CENTRAL Axile Answer :D

Discussion

10356.	Question : Placentation in tomato and lemon is:
Answer» FREE central Marginal Axile Parietal Answer :C

Discussion

10357.	Question : Placentation in a syncerpous unilocular overy where ovules occur on sutures is
Answer» APICAL PLACENTATION Parietal placentation Marginalplacentation SUPERFICIAL placentaton ANSWER :B

Discussion

10358.	Question : Placentation foound in caryophyllaceae is
Answer» AXILE BASAL PARIETAL FREE central. Answer :D

Discussion

10359.	Question : Placental mammals develop during ........
Answer» (a) EOCENE (B) OLIGOCENE (c) Pliocene (d) Paleocene Solution :Paleocene

Discussion

10360.	Question : Placental mammals develop during ………. .
Answer» EOCENE OLIGOCENE PLIOCENE PALEOCENE SOLUTION :Paleocene

Discussion

10361.	Question : Placenta makes the intimacy between mother and foetus. a. What is placenta? b. In what way it makes intimacy with foetus? c. Name the portions of foetal and maternal parts of placenta.
Answer» Solution :a. Placenta is the physiological connection between the mother and the foetus. b.The developing EMBRYO GETS nourishment and all other growth factors through the placenta. Similarly the wastes formed in the foetus are also eliminated through the placenta. All these make placenta more INTIMACY between mother and foetus. c. CHORION is the foetal part and DECIDUA basalis is the maternal part.

Discussion

10362.	Question : Placenta of human being is formed by :
Answer» Amnion CHORION Allantoin Allantoin, chorion,and UTERINE WALL. ANSWER :B

Discussion

10363.	Question : Placenta is the structural and functional unit between foetus and maternal body. Substantiate the statement.
Answer» Solution :PLACENTA connects the foetus to the uterus through an umbilical CHORD, a) They provide nutrients and oxygen to the DEVELOPING ambryo. b) Removes `CO_(2)` and waste material from the embryo c) ACTS as an endocrine tissue and PRODUCES several hormones.

Discussion

10364.	Question : Placenta
Answer» Solution :Location : It is a structure CONNECTED with uterus and umbellical CORD of female. Function : Placenta facilitates the supply of oxygen and NUTRIENTS to the embryo and REMOVES waste materials from embryo. It produces hormones like hCG, hPL, relaxin, estrogen and PROGESTERONE.

Discussion

10365.	Question : Write short note on Placenta.
Answer» Solution :Location: It is LOCATED inside the OVARIAN cavity. FUNCTION: Mega SPORANGIA DEVELOP from placenta

Discussion

10366.	Question : Placenta acts as an endocrine tissue. Justify.
Answer» Solution :Placenta secretes ENDOCRINE HORMONES such as hCG, OESTROGENS, progesterone and HUMAN PLACENTAL lactogen.

Discussion

10367.	Question : Placed in between the sperm and provides nutrition to the sperm.
Answer» GERM CELLS Interstitial cells Leydig.s cells NONE of these Answer :D

Discussion

10368.	Question : 'PLA''
Answer» Poly lactic ACID is a biodegradable . It is a bioactive thermoplastic It is aliphatic POLYESTER DERIVED from corn STARCH It is synthetic POLYMERS Solution :N/A

Discussion

10369.	Question : Pivot joint :-
Answer» AXIAL joint Shoulder joint Hip joint None Answer :1

Discussion

10370.	Question : Pituitary gland, throughtermed as masterendocrinegland,operates under instructions fromhypothalamus , bywhich this controlis kept onpituitaryglands.
Answer» Solution :(1) Hypothalamusis thecontrolling centrefor pituitarygland, (2)Hypothalamussecretesreleasingfactors and inhibitingfac-torsand henceregulate the secretions of hypophysis. E.g . Adrenocor-ticotropinhormone releasingfactor or CRF , Thyrotropinreleasingfactoror TSHRF , GHRF and GHRIF,i.e,Growthhormone releasingand releaseinhibitingfactor, etc. (3) Hypothalamusforms thehypothalamo-hypophysical axisthroughwhich transportationof neurohormones takeplace. (4) Hormones likevasopressin andoxytocin are secretedby neurosecretory cellsof HYPOTHALAMUS. (5)Hypothalamuscan register the internalchangesin the bodyas it is a partof diencephalonand THUS itaccordinglybringsabout coorinationin the bodythroughendocrinesystem.

Discussion

10371.	Question : Pituitary hangs below the hypothalamus by:
Answer» Infundibulum Mammillary body Optic chiasma None of these Answer :A

Discussion

10372.	Question : Pituitary gland is the coordination center of the all endocrine gland.
Answer» ANSWER :Hypothelamus is the COORDINATION CENTER of the all ENDOCRINE GLAND.

Discussion

10373.	Question : Pituitary gland is locarted
Answer» Above epithalamus Anterior to PINEAL body Ventral to trachea in SELLA turcica Answer :D

Discussion

10374.	Question : Pituitary dwarfism is treated with gene therapy by ……….. .
Answer» Human insulin Tissue GROWTH FACTOR - B Tissue PLASMINOGEN activator Human growth hormone producer gene Answer :D

Discussion

10375.	Question : Pits are
Answer» DEPRESSION in PRIMARY walls Depressions in SECONDARY walls Both A and B Plasmodesmal connections Answer :B

Discussion

10376.	Question : Pithecantropuserectus fossil was foundin
Answer» CHINA Japna JAVA TEXAS ANSWER :C

Discussion

10377.	Question : Pith is present in
Answer» Pith is PRESENT in Pith is present in Monocot ROOT and dicot STEM Dicot root and monocot stem ANSWER :C

Discussion

10378.	Question : Piston mechanism of pollination is found in …………….. .
Answer» Aristolochia Arum Asclepiadaceae Papilionaceae Answer :D

Discussion

10379.	Question : Piston mechanism of dispersal is the alternate name of
Answer» CENSER mechanism propellser mechanism JACULATOR mechanism PARACHUTE mechanism Answer :B

Discussion

10380.	Question : Pinus seed cannot germinate and establish without fungal association. This is because :
Answer» its EMBRYO is immature it has obligate association with MYCORRHIZAE. it has very hard seed COAT. its SEEDS contain inhibitors that prevent GERMINATION. Answer :B

Discussion

10381.	Question : Pinus differs from mango in having
Answer» tree habit green leaves ovules not enclosed in ovary wood Solution :(c) GYMNOSPERMS, (e.g. PINUS) are commonly called as naked seeded plants since their ovules (which later BECOME seed) are not covered and LIE naked on the surfaces of specialised leaves (megasporophylls or ovuliferous scales)arranged into cones.Thus, gymnosperms are also known as seeded plants without flowers or phanerogams without ovary. In contrast, angiosperms are seed bearing, flowering vascular plants in which seeds are enclosed in FRUITS, and are called as phanerogams with ovary or seeded flowering plants.

Discussion

10382.	Question : Pinna/external ear is found in
Answer» INSECTS AVES REPTILES MAMMALS . ANSWER :D

Discussion

10383.	Question : Pineapple fruit develops from
Answer» A MULTILOCULAR monocarpellary flower An unilocular polycarpellary flower A multipistillate syncarpous flower A CLUSTER of COMPACTLY borne FLOWERS on a common axis Answer :D

Discussion

10384.	Question : Pink eye is caused due to
Answer» BLOCKAGE of CANAL of Schlemn Damage to retina Inflammation of conjunctiva Opaqueness of lens Answer :D

Discussion

10385.	Question : Pineapple can be made to produce fruit throughout the year by application of
Answer» IAA, IBA NAA, 2, 4-D Phenyl ACETIC acid Cytokinins. Answer :B

Discussion

10386.	Question : Pinacoderm in sponges is made by
Answer» Pinacocytes Porocytes Amoebocytes Both (1) & (2) ANSWER :D

Discussion

10387.	Question : Pills taken orally prevents pregnancy.
Answer» Solution : These pills contain combination of progesterone - estrogen. These pills are taken from 5th day of menstrual cycle. The process of OVULATION starts after menstruation flow. The effect of these pills stops ovulation. The mucus layer of cervix becomes THICK. Mucus layer of cervix becomes inactive. The entry of sperms is prevented. This WAY the process of fertilization is obstructed and PREGNANCY doesn.t TAKE place.

Discussion

10388.	Question : Pills and Saheli
Answer» Solution :Pills : Oral ADMINISTRATION of small doses of either PROGESTERONE or PROGESTOGENS - estrogen COMBINATIONS. It is taken orally during 5-21 days of menstruation flow. Saheli : Non steroidal pill of contraception to be taken once a WEEK.

Discussion

10389.	Question :Pigments which contain oxygen and nitrogen are (A) Phycobilins (B) Carotenes (C)Xanthophylls (D) Chlorophylls
Answer» A, D B,C A, C, D D only Answer :A

Discussion

10390.	Question :Pigments present in Blue Green Algae include
Answer» CHLOROPHYLL 'a' PHYCOCYANIN PHYCOERYTHRIN All the above ANSWER :D

Discussion

10391.	Question :Pigments of PSI are present in
Answer» Appressed PART of GRANA STROMAL thylakoid & non appressed part of outer membrane of granal thylakoids Both (1) and (2) 4) None Answer :B

Discussion

10392.	Question : Pigmented layer in eye is called :
Answer» CORNEA SCLEROTIC RETINA All Answer :C

Discussion

10393.	Question : Pigment with four pyrrole rings in their structure are
Answer» CHLOROPHYLL PHYCOERYTHRIN PHYCOCYANIN All the above ANSWER :D

Discussion

10394.	Question : Pigment system connected with oxidation of water is:
Answer» PS-I PS-II Phycobilisomes Carotenoids Answer :B

Discussion

10395.	Question : Pigment system _____ is involved in evolution of oxygen.
Answer» ANSWER :PS-II

Discussion

10396.	Question : Pigment responsible for purple colour of pea flowers …..
Answer» SOLUTION :ANTHOCYANIN

Discussion

10397.	Question : Pigment molecule present at reaction centre of PS-I and PS-II respectively are
Answer» Chl-a and chl-a chl-a and chl-b chl-b and chl-a chl-b and chl-b Answer :A

Discussion

10398.	Question : Pigment-containing membranous extensions in some cyanobacteria are:
Answer» Chromatophores Heterocysts Basal bodies Pneumatophores Answer :A

Discussion

10399.	Question : Pickout the correct statement related to the DNA present in mini-satellites and microsatellites
Answer» These SEQUENCES code for some SPECIFIC proteins These sequences show very low DEGREE of polymorphism These sequences normally do not code for any protein These sequences never undergo any mutations ANSWER :C

Discussion

10400.	Question : Pigeon pea is the common name for ___________ .
Answer» a) Vigna radiata b) Vigna mungo C) Cajanus cajan d) SORGHUM vulgare ANSWER :C

Discussion

Explore topic-wise InterviewSolutions in .

Question : Placenta acts as an endocrine gland. Justify the statement

Question : Placenta acts as an endocrine gland. Write any other two functions of placenta.

Question : Plague and malaria are caused by……..and ……..repectively.

Question : placentation is axile in the overy of

Question : Placentation inTomato and Lemon is

Question : Placentation in tomato and lemon is:

Question : Placentation in a syncerpous unilocular overy where ovules occur on sutures is

Question : Placentation foound in caryophyllaceae is

Question : Placental mammals develop during ........

Question : Placental mammals develop during ………. .

Question : Placenta makes the intimacy between mother and foetus. a. What is placenta? b. In what way it makes intimacy with foetus? c. Name the portions of foetal and maternal parts of placenta.

Question : Placenta of human being is formed by :

Question : Placenta is the structural and functional unit between foetus and maternal body. Substantiate the statement.

Question : Placenta

Question : Write short note on Placenta.

Question : Placenta acts as an endocrine tissue. Justify.

Question : Placed in between the sperm and provides nutrition to the sperm.

Question : 'PLA''

Question : Pivot joint :-

Question : Pituitary gland, throughtermed as masterendocrinegland,operates under instructions fromhypothalamus , bywhich this controlis kept onpituitaryglands.

Question : Pituitary hangs below the hypothalamus by:

Question : Pituitary gland is the coordination center of the all endocrine gland.

Question : Pituitary gland is locarted

Question : Pituitary dwarfism is treated with gene therapy by ……….. .

Question : Pits are

Question : Pithecantropuserectus fossil was foundin

Question : Pith is present in

Question : Piston mechanism of pollination is found in …………….. .

Question : Piston mechanism of dispersal is the alternate name of

Question : Pinus seed cannot germinate and establish without fungal association. This is because :

Question : Pinus differs from mango in having

Question : Pinna/external ear is found in

Question : Pineapple fruit develops from

Question : Pink eye is caused due to

Question : Pineapple can be made to produce fruit throughout the year by application of

Question : Pinacoderm in sponges is made by

Question : Pills taken orally prevents pregnancy.

Question : Pills and Saheli

Question :Pigments which contain oxygen and nitrogen are (A) Phycobilins (B) Carotenes (C)Xanthophylls (D) Chlorophylls

Question :Pigments present in Blue Green Algae include

Question :Pigments of PSI are present in

Question : Pigmented layer in eye is called :

Question : Pigment with four pyrrole rings in their structure are

Question : Pigment system connected with oxidation of water is:

Question : Pigment system _____ is involved in evolution of oxygen.

Question : Pigment responsible for purple colour of pea flowers …..

Question : Pigment molecule present at reaction centre of PS-I and PS-II respectively are

Question : Pigment-containing membranous extensions in some cyanobacteria are:

Question : Pickout the correct statement related to the DNA present in mini-satellites and microsatellites

Question : Pigeon pea is the common name for ___________ .