24277 + Interview Questions in Biology in Class 12 Page 239 InterviewSolution

11901.	Question : Name the innermost wallof microsporangium.
Answer» ANSWER :Tapeyum

Discussion

11902.	Question : Name the Indian field crops which have increased productivity due to honeybees.
Answer» Solution :Sunflower, mustard, safflower, CHILLY, cabbage, cucumber, gourds, legumes, fruits LIKE apple, MANGO, citrus, etc. are the crops which have increased PRODUCTIVITY due to POLLINATION by the honeybees.

Discussion

11903.	Question : Name the inducer which regulates the switching on and off of the lac operon.
Answer» SOLUTION :LACTOSE Detailed Answer: Lactose is KNOWN as inducer in lac OPERON because it controls switching on and switching off of operon.

Discussion

11904.	Question : Name the improved characteristics of wheat that helped India to achieve green revolution.
Answer» Solution :(i) Semi-dwarf NATURE (ii) Quick yielding feature (iii) HIGH yielding feature (IV) Disease RESISTANT feature.

Discussion

11905.	Question : Name the important steps in the process of decomposition.
Answer» Solution :The important steps in the PROCESS of decomposition are FRAGMENTATION, LEACHING, catabolism, HUMIFICATION and mineralization.

Discussion

11906.	Question : Name the humors that are responsible for the health of human beings.
Answer» SOLUTION :Vatam, Pittam and Kapam.

Discussion

11907.	Question : Name the human insulin produced by genetic engineering.
Answer» SOLUTION :HUMULIN,

Discussion

11908.	Question : Name the human chromosome that has (a) most number of genes (b) least number of genes
Answer» Solution :(a) CHROMOSOME 1 bhas maximum number of genes (2968 genes) (B) Chromosome Y has least genes (231 genes)

Discussion

11909.	Question : Name the host and the site where the following occur in the life cycle of a malarial parasite. Fusion of gametocytes.
Answer» SOLUTION :MOSQUITO

Discussion

11910.	Question : Name the hormones that regulate the calcium balance.
Answer» Solution :Calcium BALANCE is regulated by thyrocalcitonin (TCT) of parafollicular CELLS of THYROID gland and parathyroid HORMONE (PTH) of parathyroid glands.

Discussion

11911.	Question : Name the hormones secreted by corpus luteum.
Answer» Solution :PROGESTERONE and RELAXIN hormones are secreted by CORPUS luteum.

Discussion

11912.	Question : Name the hormones involved in regulation of spermatogenesis.
Answer» Solution :GnRH (from the HYPOTHALAMUS), ICSH and FSH (PITUITARY), androsterone and testosterone (TESTIS)

Discussion

11913.	Question : Name the hormones involved inregulation of spermatogenesis.
Answer» SOLUTION :GNRH (GONADOTROPIN Releasing hormone) FSH-LH, TESTOSTERONE etc.

Discussion

11914.	Question : Name the hormone that stimulates development of seminiferous tubules in testis of males.
Answer» ANSWER :FOLLICLE STIMULATING HORMONE

Discussion

11915.	Question : Name the hormone that influences secretion of estrogen.
Answer» SOLUTION :Gonadotropic HORMONE - FSH

Discussion

11916.	Question : Name the hormone responsible for the descent of testes into scrotum. Why does the failure of this process result in sterility?
Answer» Solution :Gonadotropic hormone-FSH, sperm formation does not TAKE place at the abdominal TEMPERATURE while scrotum maintains the TESTICULAR temperature `2^(@)C` lower than that of body for NORMAL spermatogenesis.

Discussion

11917.	Question : Name the hormone secreted by corpus luteum.
Answer» SOLUTION :PROGESTERONE

Discussion

11918.	Question : Name the hormone purified from dog's pancreas by Banting and Best.
Answer» Solution :Insulin is the HORMONE purified from DOG's PANCREAS by Banting and BEST.

Discussion

11919.	Question : Name the hormone released by the ovary in the later phase of pregnancy.
Answer» SOLUTION :RELAXIN.

Discussion

11920.	Question : Name the hormonal composition of the oral contraceptive used by human females, How does it help in contraception?
Answer» Solution :The hormonal composition of oral contraceptive USED by females either progestogens or PROGESTOGEN - estrogen combination. They INHIBIT ovulation and implantation as WELL as alter the quality of cervical mucus to prevent entry of SPERMS.

Discussion

11921.	Question : Name the homogenous tissue in the centre of each microsporangium.
Answer» ANSWER :Sporogenous TISSUE

Discussion

11922.	Question : Name the hormnal composition of the oral contraceptive used by human females. Explain how does it acts as a contraceptive.
Answer» Solution :Oral CONTRACEPTIVE of female CONSISTS of EITHER progestogens or progesterone-estrogen combrnaion. They are TAKEN as PILLS that inhibit ovulation and implantation

Discussion

11923.	Question :Name the group of organisms and the substrate they act on to produce biogas
Answer» SOLUTION : Group of ORGANISMS: Methanobacteria, SUBSTRATE: Cattle DUNG

Discussion

11924.	Question : Name the gland in females which is homologous to Cowper's gland. Mention its function.
Answer» Solution :Bartholin's glands are homologous to Cowper's gland and they SECRETE LUBRICATING FLUID.

Discussion

11925.	Question : Name the genus of virus which are used as effective Biocontrol agent.
Answer» SOLUTION :NUCLEOPOLYHEDROVIRUS

Discussion

11926.	Question : Name the genotype of a hybrid tall pea plant.
Answer» ANSWER :TT

Discussion

11927.	Question : Name the genetic disorder caused due to the presence of extra copy of chromosome no. 21.
Answer» SOLUTION :Down SYNDROME

Discussion

11928.	Question : Name the genes responsible for making Bt cotton plants resistant to bollworm attack. How do such plants attain resistance against bollworm attacks? Explain.
Answer» Solution :The genes RESPONSIBLE for making Bt cotton PLANT resistant to boll worms are Cry I Ac and Cry II Ab. These genes from protein crystals during a particular phase of their growth. These crystals contain insecticidal protein. These crystals exist as inactive protoxins but once an INSECT ingests the inactive toxin it is converted into active form of toxin inside ALKALINE conditions of gut of insect. This solubilizes the crystals. The active toxin binds to the surface of midgut epithelial cells and create pores that cause cell swelling and lysis and CAUSES death of the insect.

Discussion

11929.	Question : Name the gene that produced Bt toxin. What does it produce?
Answer» Solution :Cry' GENE. It PRODUCES INACTIVE protoxins which can kill insects UPON INGESTION.

Discussion

11930.	Question : Name the gene of a cancer causing virus responsible for transformation.
Answer» SOLUTION :EPSTEIN BAR VIRUS (EBV)

Discussion

11931.	Question : Name the gases that were found in primitive earth's atmosphere.
Answer» SOLUTION :METHANE, AMMONIA

Discussion

11932.	Question : Name the gases filled in the gas chamber to design the conditions of primitive earth.
Answer» SOLUTION :`H_2`,`CH_3`,`NH_3` and WATER VAPOUR

Discussion

11933.	Question : Name the gas which caused the Bhopal gas tragedy in 1984.
Answer» SOLUTION :METHYL ISOCYANATE is the gas which CAUSED Bhopal gas tragedy.

Discussion

11934.	Question : Name the gaseous mixture used in Urey - Miller's experiment. Which type of physical force is applied to generate amino acids?
Answer» Solution :Ammonia, Methane, HYDROGEN, Water vapour are the GASEOUS mixture allowed to CIRCULATE over electric discharge from a tungsten electrode

Discussion

11935.	Question : Name 'the gas which caused the Bhopal gas tragedy in 1984.
Answer» SOLUTION :METHYL ISOCYANATE GAS (MIC).

Discussion

11936.	Question : Name the fungus that produces cyclosporin A.
Answer» SOLUTION :TRICHODERMA POLYSPORUM

Discussion

11937.	Question : Name the functions of the following: Fimbriae
Answer» SOLUTION :HELP in COLLECTION of OVUM after OVULATION.

Discussion

11938.	Question : Name the functions of the following: Sperm tail
Answer» Solution :Undulating MOVEMENT of tail HELPS to propel it to MOVE in themedium.

Discussion

11939.	Question : Name the fungi causing ringworms in man.
Answer» SOLUTION :EPIDERMOPHYTON, TRICHOPHYTON and MICROSPORUM.

Discussion

11940.	Question : Name the functions of the following: Corpus luteum
Answer» SOLUTION :SECRET PROGESTERONE into BLOOD.

Discussion

11941.	Question : Name the functions of the following: Endometrium
Answer» SOLUTION :Implantation of fertilised EGG (BLASTOCYST) for further development.

Discussion

11942.	Question : Name the functions of the following. a. Corpus luteum , b. Endometrium , c.Acrosome , d.Sperm tail , e.Fimbriae
Answer» Solution :a.Secretes progesterone. b.Provides space for implantation. c. HELPS the sperm to ENTER into the EGG. d.Helps the sperm for movement. e. Helps in COLLECTION of ovum after ovulation.

Discussion

11943.	Question : Name the functions of the following: Acrosome
Answer» Solution :Contains ENZYMES which HELP SPERM to PENETRATE ovum.

Discussion

11944.	Question : Name the functions of the following : (a) Corpus luteum (b) Endometrium (c ) Acrosome (d) Sperm tail (e) Fimbriae
Answer» Solution :(a) Corpus luteum : It secretes hormone projesterone which is necessary for maintenance of parturition. (b) Endometrium : It is the inner most layer of uterus. That causes cyclic changes during menstrual cycle and prepares for implantation of morula. (c ) Acrosome : It has hydrolytic enzyme for entry of fertilization of sperm into ovum. (d) Sperm tail : It help in MOTILITY of sperm. (e) Fimbriae : The part CLOSER to the OVARY is the FUNNEL shaped infundibulam. The edges of the infundibulam possess finger like projections CALLED fimbria.

Discussion

11945.	Question : Namethewhorlsof a flower.
Answer» SOLUTION :(a) CALYX (B) COROLLA (c) ANDROECIUM (d) Gynoecium

Discussion

11946.	Question : Name the four types of fission seen in animals.
Answer» SOLUTION :BINARY fission, MULTIPLE fission, Sporulation and Strobilation.

Discussion

11947.	Question : Name the four types of chromosomal aberrations.
Answer» SOLUTION :DELETION, DUPLICATION, INVERSION and TRANSLOCATION.

Discussion

11948.	Question : Name the four nearest present-day mammalian relatives of man from the point of view of organic evolution.
Answer» SOLUTION :GORILLA, CHIMPANZEE, ORANGUTAN, GIBBON

Discussion

11949.	Question : Menstruation - a cyclic event occurring in every normal woman throughout her fertile period . Name the various phases of the menstruation and explain it.
Answer» Solution :1. Menstrual phase 2. FOLLICULAR or PROLIFERATIVE phase 3. Ovulatory phase 4. LUTEAL or secretory phase

Discussion

11950.	Question : Name the four peptide hormones secreted by endocrine cells of alimentary canal.
Answer» Solution :Gastrin, SECRETIN, CHOLECYSTOKININ and GIP or Gastric inhibitory PEPTIDE.

Discussion

Explore topic-wise InterviewSolutions in .

Question : Name the innermost wallof microsporangium.

Question : Name the Indian field crops which have increased productivity due to honeybees.

Question : Name the inducer which regulates the switching on and off of the lac operon.

Question : Name the improved characteristics of wheat that helped India to achieve green revolution.

Question : Name the important steps in the process of decomposition.

Question : Name the humors that are responsible for the health of human beings.

Question : Name the human insulin produced by genetic engineering.

Question : Name the human chromosome that has (a) most number of genes (b) least number of genes

Question : Name the host and the site where the following occur in the life cycle of a malarial parasite. Fusion of gametocytes.

Question : Name the hormones that regulate the calcium balance.

Question : Name the hormones secreted by corpus luteum.

Question : Name the hormones involved in regulation of spermatogenesis.

Question : Name the hormones involved inregulation of spermatogenesis.

Question : Name the hormone that stimulates development of seminiferous tubules in testis of males.

Question : Name the hormone that influences secretion of estrogen.

Question : Name the hormone responsible for the descent of testes into scrotum. Why does the failure of this process result in sterility?

Question : Name the hormone secreted by corpus luteum.

Question : Name the hormone purified from dog's pancreas by Banting and Best.

Question : Name the hormone released by the ovary in the later phase of pregnancy.

Question : Name the hormonal composition of the oral contraceptive used by human females, How does it help in contraception?

Question : Name the homogenous tissue in the centre of each microsporangium.

Question : Name the hormnal composition of the oral contraceptive used by human females. Explain how does it acts as a contraceptive.

Question :Name the group of organisms and the substrate they act on to produce biogas

Question : Name the gland in females which is homologous to Cowper's gland. Mention its function.

Question : Name the genus of virus which are used as effective Biocontrol agent.

Question : Name the genotype of a hybrid tall pea plant.

Question : Name the genetic disorder caused due to the presence of extra copy of chromosome no. 21.

Question : Name the genes responsible for making Bt cotton plants resistant to bollworm attack. How do such plants attain resistance against bollworm attacks? Explain.

Question : Name the gene that produced Bt toxin. What does it produce?

Question : Name the gene of a cancer causing virus responsible for transformation.

Question : Name the gases that were found in primitive earth's atmosphere.

Question : Name the gases filled in the gas chamber to design the conditions of primitive earth.

Question : Name the gas which caused the Bhopal gas tragedy in 1984.

Question : Name the gaseous mixture used in Urey - Miller's experiment. Which type of physical force is applied to generate amino acids?

Question : Name 'the gas which caused the Bhopal gas tragedy in 1984.

Question : Name the fungus that produces cyclosporin A.

Question : Name the functions of the following: Fimbriae

Question : Name the functions of the following: Sperm tail

Question : Name the fungi causing ringworms in man.

Question : Name the functions of the following: Corpus luteum

Question : Name the functions of the following: Endometrium

Question : Name the functions of the following. a. Corpus luteum , b. Endometrium , c.Acrosome , d.Sperm tail , e.Fimbriae

Question : Name the functions of the following: Acrosome

Question : Name the functions of the following : (a) Corpus luteum (b) Endometrium (c ) Acrosome (d) Sperm tail (e) Fimbriae

Question : Namethewhorlsof a flower.

Question : Name the four types of fission seen in animals.

Question : Name the four types of chromosomal aberrations.

Question : Name the four nearest present-day mammalian relatives of man from the point of view of organic evolution.

Question : Menstruation - a cyclic event occurring in every normal woman throughout her fertile period . Name the various phases of the menstruation and explain it.

Question : Name the four peptide hormones secreted by endocrine cells of alimentary canal.