22339 + Interview Questions in Biology in Class 11 Page 145 InterviewSolution

7201.	Question : When and why leghaemoglobin pigment develops in root nodule of leguminous plants? Can leghaemoglobin develop in roots without bacterial invasion ?
Answer» Solution :1. Nitrogenase enzyme is NEEDED for nitrogen fixation. The enzyme is ACTIVE only in anaerobic condition. To create this anaerobic condition a PIGMENT KNOWN as leghaemoglobin is synthesized in the nodules which acts as oxygen scavenger and removes the oxygen. 2. Nitrogen fixing bacteria in root nodules appears pinkish due to the presence of this leghaemoglobin pigment.

Discussion

7202.	Question : When and where does reduction division take place in the life cycle of a liverwort, a moss, a fern, a gymnosperm and an angiosperm ?
Answer» Solution :• Liverwort : In Liverwort like Marchantia MEIOSIS takes place in sporangium of capsule of spore parent cell. That produces haploid spores. • Moss : In Mosses like Funaria meiosis takes place in capsule of sporophyte of spore mother cells. • Sporangium is produced by zygote which is MADE by fusion of male sex cell and FEMALE sex cell in ovary. • Nephrolapis : In diopteris like Nephrolapis plant possesses sporophylls. The sporangia are subtended by sporophylls sporangia produces spores by meiosis in spore mother cells. They germinate to give rise to prothallus in which gametes are produced. • Gymnosperms : In gymnosperms like Pinus meiosis takes place in MICROSPORANGIA that are borne on microsporophyll. Meiosis takes place in micro spore mother cell and produces haploid pollen grains. Pollen grain produces male gametophyte. • Angiosperms : Stamen consists anther at the tip of filament. The anthers following meiosis produce pollen grains. • Pollen grain takes part in development of male gametophyte. • Ovules are produced in ovary WITHIN ovules are present highly reduced female gametophytes. termed as embryo sacs. The embryo sac formation is preceded by meiosis each of the cell of embryo sac is haploid. •Active megaspore produces female gametophyte.

Discussion

7203.	Question : When and where does reduction division take place in thelife cycle of a liverwort, a mass, a fern, a gymnosperm and an angiosperm ?
Answer» Solution :At the time of sporogenesis within the capsule (spore formation), at the time of sporogenesis within the capsule (spore formation), in spore mother cells within sporangia present on sporophytic plant BODY, in microspore mother cells within MICROSPORANGIA present over the male cones, and in megaspore mother cell present INSIDE the ovule, in POLLEN mother cells present inside the anthersand in megaspore mother cell present inside the ovule.

Discussion

7204.	Question : When and where does reduction division take place in the life cycle of a liverwort, a moss, a fern?
Answer» Solution :In liverwort and moss: It occurs in spore MOTHER CELLS in the CAPSULE (sporophyte). In fern: It occurs in spore mother cell FOUND in SPORANGIA.

Discussion

7205.	Question : When and by whom the penicillin was discovered ?
Answer» SOLUTION :Penicillin was discovered by Alexander Flemming in 1928.

Discussion

7206.	Question : When an earthworm secretes a slime layer to receive eggsand sperm and form a 'cocoon,' this secretion is produced by the
Answer» PERITONEUM CLITELLUM NEPHRIDIUM prostornium SOLUTION :clitellum

Discussion

7207.	Question : When an apparently healthy person is diagnosed as unhealthy by a psychiatrist, the reason could be that
Answer» The PATIENT was not EFFICIENT at his work The patient was not economically prosperous The patient shows behavioural and SOCIAL MALADJUSTMENT He does not take interest in sports Answer :C

Discussion

7208.	Question : When all the carries are placed in a sequence on a redox potential scale
Answer» A scheme Z seheme M scheme L sheme Answer :B

Discussion

7209.	Question : When a tree grows older which of the following increases rapidly?
Answer» HEART WOOD SAP wood PITH Cortex Answer :A

Discussion

7210.	Question : Whena substrate is beingmetabolized, why does not all the energy that is produced get released in one step. It isreleased in multiple steps. Whatis theadvantage of step-wise release ?
Answer» SOLUTION :The PROCESS of aerobic respiration is distributed in foursteps GlycolysiS,TCA cycle, ETSand oxidative phosphorylation. The formation of ATP OCCURS in respirationstep by step ineach step. The product of one reactant is theprocess for other process. Thusentryof SUBSTANCES or break downof substances is based onrequirementof ATP. That wholeprocess is catalysid by enzymesthusreleasingof energyin SEQUENCE that makes thatprocess more work efficient. So eitherenergy is released orstored.

Discussion

7211.	Question : When a plasma membrane is split by freeze-fracture into itsouter and inner leaflets, the "bumps' visualized in electron micrographs are replicas of:
Answer» INTEGRAL PROTEINS cholesterol molecules phospholipids PERIPHERAL proteins SOLUTION :integral proteins

Discussion

7212.	Question : When a plant undergoes senescence, the nutrients may be
Answer» accumulated bound to CELL WALL translocated none of these. Solution :When a plants part undergoes senescenece, nutrient resource (minerals and carbohyrates) shift away or are translocated from the senescened part to other parts. In leaves at the time of senescence we observe loss of CHLOROPHYLL, RNA and PROTEIN, trasport of nutrients and then abscission

Discussion

7213.	Question : When a plant culture is grown in a limited amount of nutrient medium, growth is slow in the initial stage (lag phase). It increases rapidly in the exponential phase and again.
Answer» SOLUTION :GROWTH is SLOW initially because of small number of cells. The number of cell increases in EXPONENTIAL PHASE and again the growth slow down due to limited nutrients.

Discussion

7214.	Question : When a plant cell is placed in pure water, it will
Answer» BECOME rigid because of TURGOR pressure lose water and wilt swell and BURST alter its cell wall COMPOSITION so that it becomes impermeable to water Answer :A

Discussion

7215.	Question : When a person travels to higher elevations, he may develop the symptoms of acute mountain sickness. This is because of
Answer» NITROGEN narcosis high LEVEL of carbon dioxide in blood low immunity poor binding of `O_(2)` with HAEMOGLOBIN Solution :poor binding of `O_(2)` with haemoglobin

Discussion

7216.	Question : When a person has an electric shock and is short of breath he/she must be given...............
Answer» CPR ECG Vasopressin ANGIOTENSIN ANSWER :A

Discussion

7217.	Question : When a person goes deep into the sea, he/she develops complications due to
Answer» increased partial PRESSURE of `O_(2)` increase in blood nitrogen content increased partial `pressure of CO_(2)` DECREASE in the pressure in the SURROUNDING water Solution :increase in blood nitrogen content

Discussion

7218.	Question : When a neotype specimen is selected?
Answer» SOLUTION :Neotype SPECIMEN is DERIVED from non-ORIGINAL collection selected as the TYPE, when original specimen is missing or destroyed.

Discussion

7219.	Question : When a nerve fibre is stimulated, the axolemma is permeable to Nations in which of the following process?
Answer» OPENING sodium voltage-gate opening potassium voltage-gate opening sodium voltage-gate and CLOSING potassium voltage-gate opening neurolemma SOLUTION :opening sodium voltage-gate and closing potassium voltage-gate

Discussion

7220.	Question : When a muscle contracts suddenly and powerfully, it results in
Answer» STRAIN STRESS SPRAIN SPASM ANSWER :A

Discussion

7221.	Question : When a moss spore lands on an appropriate site, it germinates into the first stage of the gametophyte called :
Answer» ANTHERIDIUM RHIZOID PROTONEMA THALLUS SOLUTION :protonema

Discussion

7222.	Question : When a molecule or ion is reabsorbed from the lumen of the nephron, where does it go? If a solute is filtered and not reabsorbed from the tubule, where does it go?
Answer» Solution :(a) When a molecular or ion is reabsorbed from the lumen of the nephron it goes out of the lumen through the blood in the efferent arteriole. It is reabsorbed into the efferent arteriole which leaves the Nephron, and enters the peritubular capillaries (B) Ifa solute is filtered and not reabsorbed from the TUBULE it will finally reach the distal convoluted tubule of the nephron and enter the collecting duct to be sent out as WASTE in the FORM of urine.

Discussion

7223.	Question : When a leaf trace extends from a vascular bundle in a dicotstem, what would be the arrangement of vascular tissues in the veins of the leaf ?
Answer» Xylem would be on top and the PHLOEM on the BOTTOM Phloem would be on top and the xylem on the bottom Xylem would encircle the phloem Phloem would encircle the xylem Solution : Xylem would be on top and the phloem on the bottom

Discussion

7224.	Question : When a leaf trace extends from a vascular bundle in a dicot stem, what would be the arrangement of vascular tissues in the veins of the leaf?
Answer» Xylem would be on top and the phloem on the BOTTOM. Phloem would be on top and xylem on the bottom. Xylem would ENCIRCLE the phoem. Phloem would encircle the xylem. Answer :A::B::D

Discussion

7225.	Question : When a leaf is said to be centric ?
Answer» Solution :When the LEAF is more or less cylindrical and DIRECTED UPWARDS or DOWNWARDS, as in pine and onion, ete., the leaf is said to be centric.

Discussion

7226.	Question : When a human being is cold, the superficial blood vessels :
Answer» dilate, and the SWEAT glands are inactive dilate, and the sweat glands are ACTIVE CONSTRICT, and the sweat glands are inactive constrict, and the sweat glands are active SOLUTION :constrict, and the sweat glands are inactive

Discussion

7227.	Question : When a freshly collected spirogyra filament is kept in a 10% potassium nitrate solution, it is observed that the protoplasm shrinks in size(a) What is this phenomenon called ?(b) What will happen if the filament is replaced in distilled water ?
Answer» Solution :(a) The name of the process is plasmolysis which is SEEN in spirogyra. When FIBRES are put in 10% potassium NITRATE solution then water enters to outer cellular LIQUID from cell. So protoplasm shrinks. (b) When we put fibres in DISTILLED water then spirogyra regions its original state because water enters into cell, it is called plasmolysis.

Discussion

7228.	Question : When a fresh-water protozoan possessing a contractile vacuole, is placed in a glass containing marine water, the vacuole will
Answer» INCREASE in NUMBER DISAPPEAR increase in size decrease in size Answer :D

Discussion

7229.	Question : When a flower is said to be complete?
Answer» Solution :A FLOWER is said to be complete when it has all the four WHORLS (CALYX, corolla, androecium & gynoecium).

Discussion

7230.	Question : When a diploid female plant is crossed with a tetraploid male, the ploidy of endosperm cells in the resulting seed is?
Answer» Diploid Triploid Tetraploid Pentaploid ANSWER :C

Discussion

7231.	Question : When a cell of diameter 2 mu grows to double its diameter, what will happen to its surface area volume relationship ?
Answer» It will REDUCE to half It will REMAIN the same It cannot be determined It will double Answer :A

Discussion

7232.	Question : When a cockroach tires to enter into the ear of a sleeping person. Which one of the following process will start ?
Answer» STIMULATION of negative FEEDBACK mechanism NEUROMUSCULAR fatigue Unconditioned reflex Conditioned reflex Answer :C

Discussion

7233.	Question : When a cell is placed in hypotonic solution, water moves into the cell, this flow is called..................................
Answer» SOLUTION :ENDOSMOSIS

Discussion

7234.	Question : When a cell is placed in a hypertonic solution:
Answer» solute EXITS the cell to equalize the concentration onboth sides of the membrane water exits the cell TOWARD the AREA of LOWER soluteconcentration water exits the cell toward the area of higher soluteconcentration solute exits and water ENTERS the cell Solution :water exits the cell toward the area of higher soluteconcentration

Discussion

7235.	Question : When a cell is placed in a hypotonic solution :
Answer» solute EXITS the cell to EQUALIZE the concentration onboth sides of the membrane water exits the cell TOWARD the area of lower solute concentration water enters the cell toward the area of higher solute concentration solute exits and water enters the cell SOLUTION :water enters the cell toward the area of higher solute concentration

Discussion

7236.	Question : When a cell is placed in hypertonic solution
Answer» Exosmois OCCURS and the CELL BECOMES turgid Endosmosis occurs and cell becomes turgid Exomosis occurs and cell becomes plasmolysed Endosmosis occurs and cell becomes plasmolysed Answer :C

Discussion

7237.	Question : When a cell is placed in 0.5 M solution of salt and no change in the volume of the cell is observed, the concentration of cell sap would be
Answer» 0.5 M 0.05 M 5.0 M 50 M Answer :A

Discussion

7238.	Question : When a cell expends energy to move a solute across itsmembrane against a concentration gradient, this process is called ………..
Answer» SOLUTION :ACTIVE TRANSPORT

Discussion

7239.	Question : When a cell is kept in a 0.5 M solution of Sucrose, its volume does not alter if the same cell is placed in 0.5 M solution of sodium chloride its volume
Answer» increases decreases does not SHOW any change none of the above Answer :B

Discussion

7240.	Question : When a 5% glucose solution and an 8% glucose solution are separated by semi-premeable membrane, explain" (i) Which solution has greater osmotic pressure? (ii) In which direction osmosis occurs? (iii) Which solution will increase in volume?
Answer» SOLUTION : (i) 8% GLUCOSE solution. (II) 5% to 8% glucose solution. (ii) 8% glucose solution

Discussion

7241.	Question : Wheat grain is an example of _______
Answer» Achene CARYOPSIS Nut Follicle Solution :caryopsis

Discussion

7242.	Question : What would you call the parenchyma cells that are mode to divide under controlled laboratory conditions during plant tissue culture ?
Answer» Solution :Parenchyma cells that are made to divide to form callus under CONTROLLED laboratory conditions are example of DEDIFFERENTIATED tissue. Growth in plants is open inspite of differentiation SHOWN by them. It is so because cells/tissues that arising out of the single or same meristem show different structures after attaining maturity. Thus the final STRUCTURE at maturity of a cell/tissue arising from the same tissue is also determined by the location of the cell e.g. cells positioned away from the root apical meristems differentiate as root-cap cells, while those which are pushed to the PERIPHERY develops and mature as epidermis.

Discussion

7243.	Question : What you know about glandular tissues ?
Answer» Solution :Glandular tissue. They are ISOLATED secretory structures which may be unicellular or multicellular.Example-(i) Nectar SECRETING glands. (i) Nectar ( or honey) is a sugary SUBSTANCE secreted by nectar gland or nectaries which may be floral ( present in FLOWER) or extra floral ( on vegetative parts). (ii) Water-secreting structures ( Water stomata or hydathodes) are present along the margins and apices of leaves. The exudation of water through these is called guttation. (III) Osmophores. They secrete essential oil. (iv) Chalk or gland cells secrete salts e.g. Tamarix.

Discussion

7244.	Question : What would happen when salivery amylase which acts on starch in mouth enter in stomach ?
Answer» SOLUTION :In mouth , salivary AMYLASE changes starch into maltose. Action of amylase stops in STOMACH as it cannot act in an ACIDIC MEDIUM.

Discussion

7245.	Question : What would happen to the rate of photosynthesis in C_3 plants if the CO_2 concentration level almost doubles from its present level in the atmosphere?
Answer» SOLUTION :Rate of PHOTOSYNTHESIS in `C_3` PLANTS INCREASES with the increase in `CO_2` concentration.,

Discussion

7246.	Question : What would happen if the transpiration rate exceeds the rate of absorption in a plant?
Answer» SOLUTION :PLANT will WILT.

Discussion

7247.	Question : What would happen to a cell when placed in a hypotonic solution ?
Answer» Solution :1. The EFFECT of PLASMOLYSIS can be reversed by transferring the plasmolysed cell into water or hypotonic solution. Due to endosmosis the cell becomes turgid again. 2. It regains its ORIGINAL shape and size . This PHENOMENON of the revival of the plasmolysed cell is called deplasmolysis. Ex: Immersion of DRY raisin in water.

Discussion

7248.	Question : What would happen if HCl was not secreted in the stomach?
Answer» Solution :Hcl activates inactive PEPSINOGEN into ACTIVE pepsin.it also provides acidic medium for the action of pepsin if HCl is not secreted the GASTRIC digestion of PROTEIN will not take place.

Discussion

7249.	Question : What would happen if HCl is not secreted in the stomach?
Answer» SOLUTION :(i) Pepsinogen will not be activated to PEPSIN, hence the protein digestion will be affected. . (ii) Action of salivary amylase on starch will continue even in STOMACH.

Discussion

7250.	Question : What would happen if bile duct is somehow blocked?
Answer» Solution :(i) Acidic nature of CHYME will not be neutralized. (II) Pancreatic enzymes and intestinal enzymes will be less active. (iii) No emulsification of FATS occurs. (IV) Absorption of fats is also reduced.

Discussion

Explore topic-wise InterviewSolutions in .

Question : When and why leghaemoglobin pigment develops in root nodule of leguminous plants? Can leghaemoglobin develop in roots without bacterial invasion ?

Question : When and where does reduction division take place in the life cycle of a liverwort, a moss, a fern, a gymnosperm and an angiosperm ?

Question : When and where does reduction division take place in thelife cycle of a liverwort, a mass, a fern, a gymnosperm and an angiosperm ?

Question : When and where does reduction division take place in the life cycle of a liverwort, a moss, a fern?

Question : When and by whom the penicillin was discovered ?

Question : When an earthworm secretes a slime layer to receive eggsand sperm and form a 'cocoon,' this secretion is produced by the

Question : When an apparently healthy person is diagnosed as unhealthy by a psychiatrist, the reason could be that

Question : When all the carries are placed in a sequence on a redox potential scale

Question : When a tree grows older which of the following increases rapidly?

Question : Whena substrate is beingmetabolized, why does not all the energy that is produced get released in one step. It isreleased in multiple steps. Whatis theadvantage of step-wise release ?

Question : When a plasma membrane is split by freeze-fracture into itsouter and inner leaflets, the "bumps' visualized in electron micrographs are replicas of:

Question : When a plant undergoes senescence, the nutrients may be

Question : When a plant culture is grown in a limited amount of nutrient medium, growth is slow in the initial stage (lag phase). It increases rapidly in the exponential phase and again.

Question : When a plant cell is placed in pure water, it will

Question : When a person travels to higher elevations, he may develop the symptoms of acute mountain sickness. This is because of

Question : When a person has an electric shock and is short of breath he/she must be given...............

Question : When a person goes deep into the sea, he/she develops complications due to

Question : When a neotype specimen is selected?

Question : When a nerve fibre is stimulated, the axolemma is permeable to Nations in which of the following process?

Question : When a muscle contracts suddenly and powerfully, it results in

Question : When a moss spore lands on an appropriate site, it germinates into the first stage of the gametophyte called :

Question : When a molecule or ion is reabsorbed from the lumen of the nephron, where does it go? If a solute is filtered and not reabsorbed from the tubule, where does it go?

Question : When a leaf trace extends from a vascular bundle in a dicotstem, what would be the arrangement of vascular tissues in the veins of the leaf ?

Question : When a leaf trace extends from a vascular bundle in a dicot stem, what would be the arrangement of vascular tissues in the veins of the leaf?

Question : When a leaf is said to be centric ?

Question : When a human being is cold, the superficial blood vessels :

Question : When a freshly collected spirogyra filament is kept in a 10% potassium nitrate solution, it is observed that the protoplasm shrinks in size(a) What is this phenomenon called ?(b) What will happen if the filament is replaced in distilled water ?

Question : When a fresh-water protozoan possessing a contractile vacuole, is placed in a glass containing marine water, the vacuole will

Question : When a flower is said to be complete?

Question : When a diploid female plant is crossed with a tetraploid male, the ploidy of endosperm cells in the resulting seed is?

Question : When a cell of diameter 2 mu grows to double its diameter, what will happen to its surface area volume relationship ?

Question : When a cockroach tires to enter into the ear of a sleeping person. Which one of the following process will start ?

Question : When a cell is placed in hypotonic solution, water moves into the cell, this flow is called..................................

Question : When a cell is placed in a hypertonic solution:

Question : When a cell is placed in a hypotonic solution :

Question : When a cell is placed in hypertonic solution

Question : When a cell is placed in 0.5 M solution of salt and no change in the volume of the cell is observed, the concentration of cell sap would be

Question : When a cell expends energy to move a solute across itsmembrane against a concentration gradient, this process is called ………..

Question : When a cell is kept in a 0.5 M solution of Sucrose, its volume does not alter if the same cell is placed in 0.5 M solution of sodium chloride its volume

Question : When a 5% glucose solution and an 8% glucose solution are separated by semi-premeable membrane, explain" (i) Which solution has greater osmotic pressure? (ii) In which direction osmosis occurs? (iii) Which solution will increase in volume?

Question : Wheat grain is an example of _______

Question : What would you call the parenchyma cells that are mode to divide under controlled laboratory conditions during plant tissue culture ?

Question : What you know about glandular tissues ?

Question : What would happen when salivery amylase which acts on starch in mouth enter in stomach ?

Question : What would happen to the rate of photosynthesis in C_3 plants if the CO_2 concentration level almost doubles from its present level in the atmosphere?

Question : What would happen if the transpiration rate exceeds the rate of absorption in a plant?

Question : What would happen to a cell when placed in a hypotonic solution ?

Question : What would happen if HCl was not secreted in the stomach?

Question : What would happen if HCl is not secreted in the stomach?

Question : What would happen if bile duct is somehow blocked?