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Scientific biological reasons (support and locomotion)
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Scientific biological reasons (support and locomotion)

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scientific reasons in inter biology.

scientific reasons in inter biology.

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  • 1. Chapter 2Support and Locomotion(Failure is like joints in the body which is theprimary tool to walk but if you do not walkyou will not progress and become immobile)Biological Reasons: Dr. Sajid Ali Talpur
  • 2. Q1: Why does wilting take place during hotsummer?Ans. Because of the high temperature in thesummer transpiration is increased causingdeficiency of water and subsequently over heating.In order to avoid over heating in the plant body andto save the water wilting is brought about.Q2: Why sclerenchyma cells become dead onmaturity?Ans. Because they have to provide support and actas outer covering so their walls are alreadythickened and on reaching maturity nearly all thelumen vanishes only the dead material persists inthe cells.Q3: Why does wilting happen with the loss ofturgidity in the herbaceous stem?Ans. Since the herbaceous stem depends only on theturgidity to stand erect if it is lost, the stem loses itserection strength and falls off.Q4: How does earth worm move:Ans. Because of the hydrostatic skeleton and thepresence of two types of muscles i.e.circular andelongated. When circular muscles contract andelongated muscles contract the body elongates andshortens respectivelyQ5: How does the exposed tissue of cortex becomeprotected when primary epidermis falls off?Ans. To protect the exposed tissue and to increasein diameter, a layer of meristematic cells, the corkBiological Reasons: Dr. Sajid Ali Talpur
  • 3. cambium or phellogen arises in the cortex. The cellsof phellogen actively divide and give off new cellson both sides towards cortex are parenchymatousand form secondary cortex or phelloderm while thecells on the outer side of phelloderm arereactangular and arranged in radial rows. Theydeposit a waxy material called suberin in their walland then die. These cork tissues function as a barrierand protect stem from physical damage andpathogens. Due to its waxy nature it prevents waterloss from the srem.Q6: How bones help in homeostasis?Ans. Basically bones marvelous structure andcomposition is responsible for homeostasis. It is insuch a way that the bones allow excess blood Ca tobe deposited in them as a result of calcitoninsecretion and to maintain blood ionic concentration,demineralization occurs under the control of PTH.Q7: Do molluscs undergo moulting? If not thenwhy?Ans. their highly modified structure allows them togrow constantly and persist exoskeleton to formrings instead of moulting (ecdysis)Q8: Does exoskeleton contain sensory receptors:Ans. Yes, it contains sensory receptors known assensila which are present in the form of bristles andlensesBiological Reasons: Dr. Sajid Ali Talpur
  • 4. Q9: How do various skeletons help in movement?Ans. In case of exoskeleton it provides attachmentfor muscles whereas the joints in endoskeleton andpressure of the hydrostatic skeleton cause theanimal to move swiftly.Q10: How does exoskeleton provide support andprotection?Ans. its outer layer the epicuticle is made up ofwaxy lipoproteineous material which isimpermeable to water, serving as a barrier formicrobes and protects the animal from being easyprey?Q11: Why bones not slip and dislocate even atmoveable joints?Ans. because at moveable joints, the bones are heldin place by strong straps of connective tissue calledligaments.Q12. Why suture joints are needed?Ans. However, they are immoveable yet required toprovide compensated shape to the brain.Q13: Why skeleton muscles get readily fatigue?Ans. Because they are voluntary in action also theaccumulation of lactic acid due fermentation causesthe muscles to fatigue.Q14: How cardiac muscles are unique to skeletonand smooth muscles?Ans. They are unique because they contain theproperties of both the skeletal and smooth musclesBiological Reasons: Dr. Sajid Ali Talpur
  • 5. as striated and involuntary in action respectively.Also they initiate working before birth and stop atdeath.Q15: Where does a muscle receive energy from tocontract?Ans. The energy obviously comes from the food butthrough some intermediates like glycogen andcreatine which release ATP for muscle contraction.Q16. How can we estimate the age of a plant?Ans. the age of a plant can be estimated by countingthe annual rings which are actually the secondaryxylem in the form of concentric layers, consists ofinner zone of spring wood and outer zone ofsummer wood.Q17: Can water cause locomotion?Ans. Yes! It causes locomotion in the form of jetpropulsion as seen in jelly fish. Also the most of thehydrostatic skeleton is water.(Reference: Text books of biology for class 12)Biological Reasons: Dr. Sajid Ali Talpur
  • 6. as striated and involuntary in action respectively.Also they initiate working before birth and stop atdeath.Q15: Where does a muscle receive energy from tocontract?Ans. The energy obviously comes from the food butthrough some intermediates like glycogen andcreatine which release ATP for muscle contraction.Q16. How can we estimate the age of a plant?Ans. the age of a plant can be estimated by countingthe annual rings which are actually the secondaryxylem in the form of concentric layers, consists ofinner zone of spring wood and outer zone ofsummer wood.Q17: Can water cause locomotion?Ans. Yes! It causes locomotion in the form of jetpropulsion as seen in jelly fish. Also the most of thehydrostatic skeleton is water.(Reference: Text books of biology for class 12)Biological Reasons: Dr. Sajid Ali Talpur