1 MARK QUESTIONS for Class 10 BIOLOGY

LIFE PROCESSES

Q1. Why is energy is required by an organism even during sleep.

Q2. Give an example of an organism which derives nutrition from plants or animals without killing them. What are these organisms called?

Q3. In an experiment, saliva is added to the test tube containing pieces of bread (powdered). What will you observe?

Q4. What are the end products obtained on digestion of carbohydrates and proteins?

Q5. Name the cell organelle in which breakdown of pyruvate to give CO2, water and energy takes place.               

Q6.  It is seen that during aerobic respiration more energy is released as compared to the anaerobic respiration. Why?

Q7. During breathing cycle, what is the advantage of residual volume of air in lungs?

Q8. Why carbon dioxide is mostly transported in dissolved form?       

Q9. Why the walls of ventricles are thicker than the walls of atria?

Q10. What will happen if platelets are absent in the blood?

Q11.  Leakage of blood from vessels reduces the efficiency of pumping system. How is the leakage prevented?              

Q12. Why is right kidney placed slightly lower in position as compared to the left kidney?

Q13. Which substance is selectively reabsorbed by the tubular part of nephron?

Q14.  Out of about   170L of fluid filtered by the kidneys every day. How much is excreted in urine?

Q15. Name the substance which is present at a higher concentration in renal artery than in renal vein.

Q16. Why is urine yellow in colour?

Q17. Kidneys help in the process of osmoregulation? Explain.                    

Q18. Name two excretory products in plants other than oxygen and carbon dioxide.

Q19. Name a common nutrient that is absorbed in the small intestine and reabsorbed by the kidney tubules.

Q20. Where does digestion of fat takes place in our body?

Q21. What is the role of acid in our stomach?

Q22. Name the respiratory pigment in human beings. Where is this pigment found?  

Q23. Why is the rate of breathing in aquatic organisms much faster than in terrestrial organisms?

Q24.Name the process of loss of water in the form of vapour from the aerial parts of the plants.

Q25. How is the amount of urine produced regulated?

Q26. How would the digestion of food be affected if the bile duct is completely blocked?

Q27. Name the structure marked as ‘X’ in the given figure and also mention the functions of this structure.

LP_1

Q28.  Which raw material is responsible for the release of O2 in photosynthesis?

Q29.   What is mainly digested by stomach of man?

Q30.  What is common between respiration and transpiration process in plants?

Q31.  What will happen if a human being starts taking air with mouth instead of nose?

Q32.  What stops blood from flowing backwards through the heart?

Q33. When the right atrium contracts, blood flows from it to which part of the heart?       

Q34.What is the systolic and diastolic pressure of a normal man?

Q35.   Name the excretory organs in unicellular organisms.

Q36.   What are the major constituents of urine?

Q37.  State the process by which chemical from blood enter the dialysing fluid?

Q38.   Name the substance which is present in the blood, but not in the urine of a healthy person?

Q39. What is the main function of kidneys in humans?

Q40. Fishes die when taken out of water. Why?

Q41. Why does a piece of bread start tasting sweeter after it is chewed for sometime?

Q42. How is urine produced?

Q43.  What will happen if the liver of a person gets damaged?

Q44.  Compare between the process of respiration in plants during night and day time.

Q45.       Enumerate the difference between translocation and transpiration.

Q46.   Tabulate two differences between renal artery and renal vein.   

Directions (0.  Nos.47-51) In the following questions,  a statement of Assertion is followed by a statement of Reason. Mark the correct choice as

(a) If both Assertion and Reason are true, and Reason is the correct explanation of Assertion

(b) If both Assertion and Reason are true but Reason is not the correct explanation of Assertion

(c) If Assertion is true, but Reason is false

(d) If Reason is true, but Assertion is false

(e) If both Assertion and Reason are false

Q47. Assertion: Lungs always contain a residual volume of air.

            Reason: It is so to ensure enough time for the release of CO2 and for the absorption of O2 .

Q48. Assertion: In a healthy adult, the initial filtrate in the kidneys is about 180 L daily, but the actual volume excreted is only a litre a day.

            Reason: Most of the filtrate is lost from the body in the form of sweat.

Q49. Assertion: Respiration is opposite of Photosynthesis

            Reason: In Photosynthesis food is made from energy and in Respiration food is converted to energy.

Q50. Assertion: The four chambered heart does not mix oxygenated and deoxygenated blood.

            Reason: Four chambered heart is found in mammals with advanced body functions.

Q51. Assertion: Translocation of food occurs in Plants.

            Reason: Xylem tissue is responsible for Translocation.

Q52.  Select the incorrect pair.

(a) Respiration- – Oxidation of food to obtain energy

(b) Nutrition – Obtaining and utilising nutrients

(c) Transportation- Response to stimuli

(d) Excretion – Removed of waste by-products

Q53.  Which one of the following juices secreted in the human body does not contain any enzyme?

(a) Salivary juice

(b) Bile juice

(c) Gastric juice  

(d) Pancreatic juice

Q54.  Rings of cartilage present in the throat ensure that

(a) the air passage collapses

(b) the air passage does not collapse

(c) the air is filtered entering the nostrils

(d) None of the above

Q55. The function of the lymph fluid is to

(a) drains excess fluid from extracellular space back into the blood

(b) carries digested and absorbed fat from intestine

(c) circulates around the body and help in clotting of blood

(d) Both (a) and (b)

CONTROL AND COORDINATION

  Q1. Name two tissues, which provide control and coordination in animals.

  Q2. Name two components of the central nervous system in humans.                 

  Q3. Give some examples of involuntary actions.

  Q4. Give anyone function performed by our brain.

 Q5. Name any two types of tropic movements.

Q6. Name one plant growth hormone, which makes the seed dormant during extremely dry season.

Q7. Why adrenaline is known as emergency hormone?

Q8. What are inhibitory hormones?

Q9. Endocrine glands are called ductless glands. Why?

Q10. Define phototropism.

Q11. Give one example of chemotropism.

Q12. State the main functions of abscisic acid in plants.

Q13. Name two components of central nervous system in humans.

Q14. Name the largest cell present in the human body.

Q15. Mention the part of the brain which controls the involuntary actions like blood pressure, salivation etc.

Q16. Name the part of the neuron where information is acquired.

Q17. What is synapse?

Q18. Mention the part of the body where gustatory and olfactory receptors are located.

Q19. Define feedback mechanism of hormones.

Q20. Name the diseases by which a person is likely to suffer due to the deficiency of:

          (i)   Iodine

         (ii)  Insulin

Q21. We suddenly pull our and away on touching a pointed object. Name the type of response involved in this action.

Q22.’This plant hormone has its maximum concentration in fruits and seeds.’ Name the plant hormone.

Q23. Is reflex action the only function of spinal cord. Support your answer with a single statement.

Q24. The sensation of feeling fear or hunger is associated with which part of brain?

Q25. Name the source and target organ of adrenaline.

 Directions (Q. Nos. 26 – 30) In the following questions, a statement of Assertion is followed by a statement of Reason. Mark the correct choice as

(a) If both Assertion and Reason are true, and Reason is the correct explanation of Assertion

(b) If both Assertion and Reason are true, but Reason is not the correct explanation of Assertion

(c) If Assertion is true, but Reason is false

(d) If Reason is true, but Assertion is false

(e) If both Assertion and Reason are false

Q26. Assertion: Activities like walking in a straight line – riding a bicycle are possible due to cerebellum.

           Reason: Cerebellum is responsible for precision of the voluntary actions and maintaining the posture and balance of the body.

Q27. Assertion: When light comes from one side of a plant, the plant bends towards light.

            Reason: Auxin diffuses towards the shady side of the shoot and causes the cells to grow longer on that side of the shoot which Is away from light.

Q28. Assertion: The cerebrospinal fluid is found between the meninges.

             Reason: The cerebrospinal fluid protects the brain from external shocks.

Q29. Assertion: Thyroid Glands are called ductless glands.

             Reason: Thyroid glands are located at the place where they are required.

Q30. Assertion: Phototropism and Geotropism are two opposite kind of tropism.

            Reason: Geotropism is seen in roots and phototropism is seen in shoots.

Q31. Which one of the following is the main thinking part of the brain?

(a) Forebrain       

(b) Midbrain

(c) Hindbrain      

(d) Medulla

Q32. In response to nervous electrical impulses, the special proteins found in muscle cells change their

(a) shape                                           

(b) size

(c) arrangement in the cell                             

(d) Both (a) and (c)

Q33. Which of the following group of plant hormones help in the growth of the stem?

(a)  Auxins and cytokinins        

(b) Gibberellins and abscisic acid

(c)  Auxins and gibberellins     

(d)  None of the above

Q34. Which one of following hormones regulates carbohydrate, protein and fat metabolism in the body?

(a)  Insulin                         

(b) Thyroxine

(b) Growth hormone         

(d) Oestrogen

HOW TO ORGANISMS REPRODUCE

Q1.  What happens when Planaria gets cut into two pieces?

Q2.  Why are testis located outside the abdominal cavity?

Q3.  In which part of the female reproductive tract does the egg gets fertilised?

Q4.  What is the function of the umbilical cord?

Q5.  How hormonal methods of contraception act?

Q5. Name the type of reproduction mostly seen in unicellular organisms.

Q6. Name the plant that reproduces vegetatively by leaf.

Q7. When a cell reproduces, what happens to its DNA?

Q8. Name the method by which Hydra reproduces. Is this method sexual or asexual?

Q9. State the method used for growing rose plants and jasmine plants.

Q10. “Cell division is a type of reproduction in unicellular organism”. Justify.

Q11. List two functions of ovary of human female reproductive system.

Q12. Name the organs producing sperms and ova respectively in humans.

Q13. Give reason for the statement-‘Since the ovary releases one egg every month, the uterus also prepares itself every month by making its lining thick and spongy’.

Q14. No two individuals are absolutely alike in a population. Why?

Q15. How do we know that two different individuals belong to the same species?

Q16. In a bisexual flower inspite of the young stamens being removed artificially, the flower produces fruit. Provide a suitable explanation for the above situation.

Q17.       Name the individual units of floral whorls.

Q18.       Delivery of sperms from where they are produced to urethra is facilitated by which part?

Directions (Q. Nos. 19 – 23) In the following questions, a statement of Assertion is followed by a statement of Reason. Mark the correct choice as

(a) If both Assertion and Reason are true, and Reason is the correct explanation of Assertion

(b) If both Assertion and Reason are true, but Reason is not the correct explanation of Assertion

(c) If Assertion is true, but Reason is false

(d) If Reason is true, but Assertion is false

(e) If both Assertion and Reason are false

Q19. Assertion: The uterus prepares itself every month to receive a fertilised egg.

            Reason: The ovary releases one egg every month.

Q20. Assertion: Ureter forms the common passage for both the sperms and urine.

            Reason: It never carries both of them at the same time.

Q21. Assertion: Zygote is form by fusion of sperm with Egg.

            Reason: Both the sperm and the egg are haploid.

Q22. Assertion: Pollination is the transfer of pollen grain to the anther.

            Reason: Pollination is carried out by wind, birds and insects.

Q23. Assertion: Contraception is used to avoid unnecessary pregnancies.

            Reason: Contraception is used by both males and females.

Q24.  Callus is defined as

(a) an insoluble carbohydrate

(b) tissue which forms embryo

(c) tissue which grows to form embryoid

 (d) an unorganised actively dividing mass of cells maintained in a culture

Q25.  What is the role of secretions of seminal vesicles and prostate glands?

(a) Provides transport medium only

(b) Provides nutrition only

(c) Provides maturation of ovary

(d) Both (a) and (b)

Q26. Identify the disease which is caused by a virus.

(a) Syphilis                        

(b) Genital warts

(c) Gonorrhoea                     

(d) Both (a) and (c)

Q27.  What would be the major effects of removing ovary on female reproductive system?

(a) Production of egg will stop forever

(b) Hormones will produce in large amount

(c) Entry of male gametes into oviduct will halt

(d) All of the above

HEREDITY AND EVOLUTION

Q1. In any population, no two individuals are absolutely similar. Why?

Q2. What is the cause of variation in asexually reproducing organisms?

Q3. Give an example where sex is determined by environmental factors.

Q4. In a beetle population, the number of green beetles is more than blue and red beetles. Give a reason behind this situation.

Q5. Write one word for the formation of new species due to gradual change over long period of time.

Q6. Give an example of a characteristic being used to determine, what relationship do two species have in terms of evolution?

Q7.  What is a gene?

Q8.  What is heredity?

Q9. Give the respective scientific terms used for studying:

(i) the mechanism by which variations are created and inherited and,

(ii) the development of new type of organisms from the existing ones.

Q11.  What is speciation?

Q12. List any two factors that could lead to speciation?

Q13.  When does the process of gene flow take place?

Q14.  When is a recessive trait able to show up?

Q15.  Which among the males and females are homogametic?

Q16.  In which animals, the feathers do not fulfil the purpose of flying?

Q17.  Enumerate the functions of chromosomes.

Q18.  What is F2 -generation?

Q19. Genes and chromosomes have similar behaviour. Justify.

Q20. Among all the chromosomes, what is different about a sex chromosome?

Q21.  Give the role of genes in evolution.

Q22.  Name two important factors that cause development of a new species.

Directions (Q. Nos. 23 – 27) In the following questions, a statement of Assertion is followed by a statement of Reason. Mark the correct choice as

(a) If both Assertion and Reason are true, and Reason is the correct explanation of Assertion

(b) If both Assertion and Reason are true, but Reason is not the correct explanation of Assertion

(c) If Assertion is true, but Reason is false

(d) If Reason is true, but Assertion is false

(e) If both Assertion and Reason are false

Q23. Assertion: Mendel self-crossed F1 tall plants with wrinkled seeds to obtain F2 generation.

            Reason: F1 progeny of a tall plant with round seeds and a dwarf plant with wrinkled. seeds are all dwarf plants having wrinkled seeds.

Q24.  Assertion: The experiences of an individual during its lifetime cannot be passed on to its progeny.

             Reason: Change in non-reproductive tissues cannot be passed on to DNA of germ cells.

Q25.  Assertion: Mendel choose pea plants for his experiment.

            Reason: Pea plants were the only plants he could gather for his experiment.

Q26.  Assertion: Evolution of also occurs by way for ‘Genetic Drift’.

             Reason: Genetic Drift leads to selection animals who have the most advantageous mutations.

Q27.  Assertion: Homologous and Analogous organs are method of tracing Evolutionary relationship.

             Reason: Homologous and Analogous organs are studied on the basis of fossils found in the Earth.

Q28. If pea plants having round green seeds and wrinkled yellow seeds are crossed, what phenotypic ratio will be obtained F2  progeny plants?

(a) 1: 2: 1             

(b) 3: 1                 

(c) 9: 3: 3: 1        

(d) 9: 3: 4

Q29. Section of DNA that provides information for one protein is called

(a) genotype        

(b) chromosome

(c) gene

(d) character

Q30.  An example of analogous organs is

(a) the wings of birds and bats

(b) our teeth and an elephant’s tusks

(c) potato and runners of grass

(d) our arm and dog’s foreleg.

Q31.  In human beings, the sex of child depends on whether the paternal chromosome is

(a) x (for boys) or Y (for girls)       

(b) X (for girls) or Y (for boys)

(c) present                                         

(d) absent

***

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