4951 + Interview Questions in Biology in Class 10 Page 78 InterviewSolution

3851.	Question : Define : Explain the terms : Conventional sources of energy
Answer» Solution :Those sources of ENERGY which MEET our major energy requirement are KNOWN as CONVENTIONAL sources of energy.

Discussion

3852.	Question : Define : Explain the terms : Biogas
Answer» Solution :A fuel gas that is produced ANAEROBICALLY from BIOMASS is CALLED BIOGAS.

Discussion

3853.	Question : Define : Explain the terms : Fossil fuels
Answer» Solution :The fuels such as coal, petroleum and natural gas, that were FORMED MILLIONS of years ago from DEAD and fossiliged animals or plants in the ground are CALLED fossil fuels.

Discussion

3854.	Question : Define evolution. How does it occur? Describe how fossils provide us evidences in support of evolution
Answer» Solution :Evolution is a gradual process leading to heritable changes over several generations. It occurs due to natural selection, mutation or genetic drift. The preserved traces of fossils help in • establishing EVOLUTIONARY traits among ORGANISMS and their ancestors (homologous structures). • establishing the time PERIOD in which organisms LIVED from the position of fossils in the layer of the rocks • documenting the existence of now-extinct SPECIES that are related to present-day species.

Discussion

3855.	Question : Give two uses of fossils. How does the study of fossils provide evidence in favour of organic evolution?
Answer» Solution :Evolution the PROCESS of change from simple life FORMS to complex life forms by gradual change. It is generating diversity and shaping the diversity. (i) It occurs over the course of time and generations by variation speciation, natural selection, genetic drift etc. fossil are the preserved traces of living organisms. (ii) It helps us to find the intermediate forms in between two classes etc. For example fossil of Archaeopteryx helps us to know better about the intermediate form between REPTILES and aves. (iii) It it tells us about the EXTINCT species through the fossil or their retained body impressions. (iv) It helps to know the EVOLUTIONARY relationships. (v) This also shows the line of development from primitive to complex organisms. eg. Ammonite trilobite, Orthoceras etc. according to the depth of the layer in which it is found.

Discussion

3856.	Question : Define Ethnobotany and write its importance.
Answer» Solution :Ethnobotany is the study of a region.s plants and their practical uses through the traditional knowledge of the local culture of people. Importance of Ethnobotany : 1. It provides traditional uses of plant. 2. If gives information about certain unknown and known useful plants. 3. The ethno MEDICINAL data will serve as a useful source of information for the chemists pharmacologists and practitioners of herbal MEDICINE. 4. Tribal communities utilize ethnomedicinal plant parts like BARK, stem roots, leaves, flowers, flower bud,fruits, seeds, oils, resins, dyes and gum for the treatment of diseases like diarrhoea, fever, headache, diabetes, jaundice, snakebites and leprosy, stc.

Discussion

3857.	Question : Define dark reaction.
Answer» Solution :A chemical reaction, which can TAKE PLACE even in the absence of LIGHT, is called a dark reaction or light independent reaction. It takes place in STROMA of CHLOROPLAST.

Discussion

3858.	Question : Define classification. What is the significance of classification ? What is the six kingdom classification ?
Answer» Solution :Grouping organisms on the basis of their similarities and DIFFERENCES. SIGNIFICANCE : – Aids in study, better understanding, PREDICTING the FEATURESOF the group known. Refer ‘Points to Remember’ for six kingdom classification in three domainsof life.

Discussion

3859.	Question : Define chromosome.
Answer» Solution :Chromosome is a thread-like structure that bears GENES and are ENCLOSED within a NUCLEUS. It is composed of DNA and protein.

Discussion

3860.	Question : Define cardiac cycle.
Answer» SOLUTION :A regular SEQUENCE of THREE events (i) auricular SYSTOLE (ii) ventricular systole and (III) Joint diastole during the completion of one heart beat.

Discussion

3861.	Question : Define and show in a diagram, the following terms relating to concave mirrors. i) Aperture ii) Radius of curvature List any four uses of concave mirror.
Answer» Solution :i) The diameter of the REFLECTING surface of the mirror is called aperature . ii) The radius of the sphere of which reflecting surface of the spherical mirror forms a part is called the radius of curvature of the spherical mirror. Uses of concave mirror are : `` Shaving mirror `` Reflectors in automobile HEAD light and torches `` By DENTISTS to see back side of tooth. `` Reflector of solar FURNACES.

Discussion

3862.	Question : Define alleles.
Answer» Solution : GENES which code for a PAIR of contrasting TRAITS are known as ALLELES, i.e., they are different FORMS of the same gene.

Discussion

3863.	Question : Define Adhesion.
Answer» Solution :The FORCE of ATTRACTION between MOLECULES of different SUBSTANCES is called ADHESION.

Discussion

3864.	Question : Define :(a) Genus(b) Family(c) Order
Answer» SOLUTION :(a) GENUS : Group of RELATED species, (B) Family : Group of related GENERA, ( c ) Order : Group of related familes.

Discussion

3865.	Question : Define a gene (give any one definition.)
Answer» SOLUTION :GENE is a PHYSICAL UNIT of HEREDITY.

Discussion

3866.	Question : Define a gene.
Answer» SOLUTION :Gene is a segment of a DNA molecule which CARRIES the code for the synthesis of a SPECIFIC PROTEIN.

Discussion

3867.	Question : Define a food web. State its significance for ecosystem.
Answer» Solution :A system of food CHAINS which are INTERCONNECTED between various organisms is called a food web. The significance of food web is in the maintenance of ecological BALANCE based upon interdependence of different organisms.

Discussion

3868.	Question : Deficient blood supply to heart muscle: Ischemia: Death of the heart muscle tissue: ............
Answer» SOLUTION :MYOCARDIAL INFARCTION

Discussion

3869.	Question : Deficiency of vitamin B_(1) leads of
Answer» beriberi night blindness rickets scurvy Answer :A

Discussion

3870.	Question : Deficiency of vitamin C causes
Answer» rickets beriberi scurvy night blindness Answer :C

Discussion

3871.	Question : Deficiency of thyroid hormone in infants results
Answer» MYXOEDEMA Cretinism Grave's disease Exophthalmic goitre Answer :B

Discussion

3872.	Question : Deekshith conduced an experiment to find the presence of starch in leaves. Draw a diagramfor this experiment.
Answer» SOLUTION :

Discussion

3873.	Question : Deer,tiger, frog, lion.
Answer» SOLUTION :DEER- OTHERS are CARNIVORES

Discussion

3874.	Question : Deer, elephant,zebra, wolf.
Answer» SOLUTION :WOLF- OTHERS are herbivors

Discussion

3875.	Question :Decreased secretion of thyroid hormones in the children leads to………..
Answer» SOLUTION :CRETINISM

Discussion

3876.	Question : Decomposers are crucial biotic factors in an ecosystem.
Answer» Solution :(i) Most decomposers are fungi and bacteria. (ii) In the process of feeding, they use the energy left in dead and DECAYING MATTER. (iii) If decomposers were not the PART of ecosystem, then the nutrients that entered food chain would temain locked up forever in the wastes THROWN outby the bodies of the organisms, and after death, in their bodies. (iv) Less and less nutrients would remain available to PLANTS, and through them, to other creatures. (v) The waste would go on building up around us till all life on earth would be overwhelmed by its own wastes, ifthe decomposers were not there. (vi) Thus, decomposers are crucial biotic factors of ecosystems.

Discussion

3877.	Question : Decomposers
Answer» SOLUTION :BACTERIA, FUNGI

Discussion

3878.	Question : What are decomposers?
Answer» Solution :The ORGANISMS which decompose the dead organisms to DRIVE their FOOD are called DECOMPOSERS.

Discussion

3879.	Question : Dead remains of two species A and B were buried. Later only A's body was found to be a fossil but not B's. Give reason to explain it.
Answer» Solution :Fossils are formed only when the dead parts are hard and get BURIED immediately without getting DECOMPOSED. In this case, A may have left its imprints as FOSSIL while B may have decomposed and hence has not formed fossil.

Discussion

3880.	Question : Dead cells of phloem are
Answer» COMPANION cells parenchyma fibres sieve TUBES ANSWER :C

Discussion

3881.	Question : DDT is
Answer» non-degradable pollutant degradable pollutant GREEN house GAS none of these ANSWER :A

Discussion

3882.	Question : Darwin's theory of Natural selection could not explain,
Answer» cause of DISCONTINUOUS VARIATIONS inheritance of USEFUL variations survival of the fittest FORMATION of NEW species Answer :A

Discussion

3883.	Question : Darwin worked on Galapagos finches. The number of species of these finches is
Answer» 10 12 14 11 Answer :C

Discussion

3884.	Question : Darwin is associated with :
Answer» NATURAL SELECTION Mutation Inorganic EVOLUTION All the above. Answer :A

Discussion

3885.	Question : Dark reaction of photosynthesis occurs is the
Answer» stroma of the CHLOROPLAST OUTSIDE the lamellae space between the two MEMBRANES of the chloroplast membranes of the stroma lamellae thylakoid MEMBRANE of the grana Answer :A

Discussion

3886.	Question : Dark reaction is traced by
Answer» <P>X-rays `O^(18)` `""^(14)O_(2)` `P^(32)` ANSWER :C

Discussion

3887.	Question : Dark reaction in photosynthesis is called so because
Answer» it does not REQUIRE light energy cannot OCCUR during daytime occurs more RAPIDLY at night it can also occur in darkness ANSWER :A

Discussion

3888.	Question : Cytokinin promotes
Answer» ELONGATION of INTERNODES formation of branches cell division flowering ANSWER :C

Discussion

3889.	Question : Cyclic photophosphorylation is performed by,
Answer» PS I PS I and II PS II Entire cloroplast Answer :A

Discussion

3890.	Question : Cycas resembles angiosperms in having
Answer» vessels siphonogamy dichotomous branching circinate VERNATION ANSWER :B

Discussion

3891.	Question : Cycas is a gynosperm because of
Answer» vessels PRESENT in xylem living fossil naked SEED WITHOUT fruit none of the above ANSWER :C

Discussion

3892.	Question : Cyanobacteria are
Answer» chemoautotrophs chemoheterotrophs photoiheterotrophs photoautotrophs ANSWER :D

Discussion

3893.	Question : Cuticle, Epidermis, Sphincters, Muscular layer.
Answer» SOLUTION :SPHINCTERS

Discussion

3894.	Question : Cut leaves remain green for longer time when dip ped in
Answer» cytokinins ethylene gibberellins auxins Answer :A

Discussion

3895.	Question : Cushing's disease is caused by
Answer» disturbance in FAT metabolism excess of ACTH SECRETION by the pituitary under secretion of insulin none of the above Answer :B

Discussion

3896.	Question : Cuscuta is a
Answer» TOTAL STEM PARASITE partial stem parasite epiphyte total ROOT parasite ANSWER :A

Discussion

3897.	Question : Curdling of milk in the stomach is due to the action of
Answer» Pepsin rennin HCI renin ANSWER :B

Discussion

3898.	Question : Crypts of Lieberkuhn are present in
Answer» PANCREAS and secrete pancreatic juice small intestine and secrete DIGESTIVE EN zymes stomach and secrete dilute HYDROCHLORIC acid stomach and secrete PEPSIN Answer :B

Discussion

3899.	Question : Crowngall disease is caused by
Answer» bacteria virus fungi Mycoplasma Answer :A

Discussion

3900.	Question : Cross-pollination is advantageous because it results in
Answer» formation of WEAKER progeny formation of BETTER progeny formation of male offspring formation of female offspring Answer :B

Discussion

Explore topic-wise InterviewSolutions in .

Question : Define : Explain the terms : Conventional sources of energy

Question : Define : Explain the terms : Biogas

Question : Define : Explain the terms : Fossil fuels

Question : Define evolution. How does it occur? Describe how fossils provide us evidences in support of evolution

Question : Give two uses of fossils. How does the study of fossils provide evidence in favour of organic evolution?

Question : Define Ethnobotany and write its importance.

Question : Define dark reaction.

Question : Define classification. What is the significance of classification ? What is the six kingdom classification ?

Question : Define chromosome.

Question : Define cardiac cycle.

Question : Define and show in a diagram, the following terms relating to concave mirrors. i) Aperture ii) Radius of curvature List any four uses of concave mirror.

Question : Define alleles.

Question : Define Adhesion.

Question : Define :(a) Genus(b) Family(c) Order

Question : Define a gene (give any one definition.)

Question : Define a gene.

Question : Define a food web. State its significance for ecosystem.

Question : Deficient blood supply to heart muscle: Ischemia: Death of the heart muscle tissue: ............

Question : Deficiency of vitamin B_(1) leads of

Question : Deficiency of vitamin C causes

Question : Deficiency of thyroid hormone in infants results

Question : Deekshith conduced an experiment to find the presence of starch in leaves. Draw a diagramfor this experiment.

Question : Deer,tiger, frog, lion.

Question : Deer, elephant,zebra, wolf.

Question :Decreased secretion of thyroid hormones in the children leads to………..

Question : Decomposers are crucial biotic factors in an ecosystem.

Question : Decomposers

Question : What are decomposers?

Question : Dead remains of two species A and B were buried. Later only A's body was found to be a fossil but not B's. Give reason to explain it.

Question : Dead cells of phloem are

Question : DDT is

Question : Darwin's theory of Natural selection could not explain,

Question : Darwin worked on Galapagos finches. The number of species of these finches is

Question : Darwin is associated with :

Question : Dark reaction of photosynthesis occurs is the

Question : Dark reaction is traced by

Question : Dark reaction in photosynthesis is called so because

Question : Cytokinin promotes

Question : Cyclic photophosphorylation is performed by,

Question : Cycas resembles angiosperms in having

Question : Cycas is a gynosperm because of

Question : Cyanobacteria are

Question : Cuticle, Epidermis, Sphincters, Muscular layer.

Question : Cut leaves remain green for longer time when dip ped in

Question : Cushing's disease is caused by

Question : Cuscuta is a

Question : Curdling of milk in the stomach is due to the action of

Question : Crypts of Lieberkuhn are present in

Question : Crowngall disease is caused by

Question : Cross-pollination is advantageous because it results in