Living Creatures: Exploring their Characteristics

Humare aas-paas ki cheezein ya toh living hoti hain ya non-living. Inko differentiate karne ke liye hum kuch common characteristics dekhte hain. Jaise:

• Movement: Living things move karte hain. Animals ek jagah se doosri jagah jaate hain. Plants move nahi karte, but unke parts (jaise leaves, flowers) movement dikhate hain. Example: Chhui-mui (Touch-me-not) plant ke leaves touch karne par fold ho jaate hain.
• Growth: Living things grow karte hain. Ek chhota bachcha bada hota hai, ek seed se plant banta hai. Non-living things grow nahi karte (unka size change ho sakta hai, but wo growth nahi hai).
• Food (Nutrition): Living things ko energy ke liye food chahiye hota hai. Plants apna food khud banate hain (photosynthesis se), animals food ke liye plants ya other animals par depend karte hain.
• Respiration: Living things saans lete hain. Oxygen andar lete hain aur Carbon dioxide bahar nikalte hain. Yeh process energy release karta hai. Plants bhi respire karte hain stomata ke through.
• Excretion: Living things waste products ko body se remove karte hain. Animals urine aur sweat ke through, plants extra water droplets ke form mein nikalte hain.
• Response to Stimuli: Living things apne surroundings mein changes (stimuli) par react karte hain. Jaise, garam cheez ko chhoone par haath hata lena, ya plant ka sunlight ki taraf grow karna.
• Reproduction: Living things apne jaise naye individuals produce karte hain, taaki life ki continuity bani rahe. Animals babies dete hain, plants seeds se grow karte hain.
• Life Cycle & Death: Sabhi living things ka ek life cycle hota hai – birth, growth, reproduction, aur finally death. Non-living things ka koi life cycle nahi hota.

Agar koi cheez in mein se koi bhi characteristic show nahi karti, toh woh non-living hai.

Living vs Non-living: Quick Comparison

Living beings ke do bahut important characteristics hain respiration aur excretion, jo unhe non-living se alag karte hain.

Respiration (Saans Lena)

• Definition: Yeh ek process hai jismein living organisms food se energy release karte hain, usually oxygen ka use karke.
• Animals mein:
• Hum humans aur most animals air se oxygen andar lete hain (inhale) aur carbon dioxide bahar nikalte hain (exhale).
• Yeh process body ke har cell mein hota hai, jahan food molecules ko break karke energy banayi jaati hai.
• Aap apni breathing rate ko observe kar sakte ho – rest par alag, run karne ke baad alag.
• Dogs, cats jaise animals mein bhi unke abdomen ke movement se breathing observe kar sakte hain.
• Plants mein:
• Plants bhi respire karte hain. Din mein photosynthesis ke saath-saath respiration bhi hota hai.
• Raat mein, jab sunlight nahi hoti, plants sirf respire karte hain.
• Leaves ki surface par tiny pores hote hain jinhe stomata kehte hain. Inhi stomata se plants air (oxygen) andar lete hain aur carbon dioxide bahar nikalte hain.
• Roots bhi soil se air absorb karti hain respiration ke liye.

Excretion (Waste Products Nikalna)

• Definition: Living beings ke body mein metabolic activities ke dauran kuch waste products bante hain, jinhe body se remove karna zaroori hota hai. Is process ko excretion kehte hain.
• Animals mein:
• Humans mein, urine aur sweat (pasina) waste products hain. Sweat mein water aur salts hote hain, jo armpits par white patches banate hain.
• Urine kidneys banati hain aur body se remove karti hain.
• Feces (stool) bhi digestive waste hai, jo body se nikalta hai.
• Plants mein:
• Plants bhi waste products nikalte hain.
• Excess water aur minerals ko plants leaves par small droplets ke form mein nikalte hain. Jaise, grass aur rose plants mein subah-subah dew drops ki tarah dikhte hain, yeh actually guttation hai (excess water excretion).
• Kuch plants waste products ko apni old leaves, bark ya fruits mein store kar lete hain, jo baad mein shed ho jaate hain.
• Oxygen, jo photosynthesis ka by-product hai, plants ke liye waste product hai aur stomata ke through release hota hai.

Respiration aur Excretion ka Importance

• Respiration: Body ko continuous energy supply karta hai, jo growth, movement aur saari life processes ke liye essential hai.
• Excretion: Body se harmful waste products ko remove karta hai, jisse body healthy rehti hai aur proper functioning kar paati hai.

Living beings ke do aur important characteristics hain stimuli ke prati response aur reproduction.

Response to Stimuli (Uddipan ke Prati Pratikriya)

• Definition: Koi bhi change ya event jo living beings ko react karne par majboor karta hai, use stimulus (plural: stimuli) kehte hain. Aur us change ke prati jo reaction hota hai, use response kehte hain.
• Animals mein:
• Sharp object par pair rakhne par turant pair hata lena.
• Garam cheez ko chhoone par haath peeche kheench lena.
• Tez roshni mein aankhein band kar lena.
• Bhukh lagne par food search karna.
• Plants mein:
• Plants bhi stimuli ke prati respond karte hain, although unka response animals jitna fast nahi hota.
• Touch: Chhui-mui (Touch-me-not) plant ke leaves touch karne par fold ho jaate hain. Yeh touch stimulus ka response hai.
• Light: Plants sunlight ki taraf grow karte hain (phototropism). Kuch plants ke leaves sunset ke baad fold ho jaate hain (jaise amla tree ke leaves).
• Water: Roots water ki taraf grow karti hain (hydrotropism).
• Gravity: Shoots upar ki taraf aur roots neeche ki taraf grow karti hain (geotropism).

Reproduction (Prajanan)

• Definition: Woh process jismein living beings apne jaise naye individuals produce karte hain, use reproduction kehte hain.
• Importance: Reproduction life ki continuity ke liye essential hai. Agar reproduction na ho, toh species extinct ho jayegi.
• Animals mein:
• Animals eggs dete hain (jaise birds, fish, insects) ya young ones ko birth dete hain (jaise humans, dogs, cats).
• Har animal apne hi type ke young ones produce karta hai.
• Plants mein:
• Plants mainly seeds se reproduce karte hain. Seeds germinate hokar naye plants banate hain.
• Kuch plants stem cuttings (gulab), leaves (bryophyllum) ya roots se bhi reproduce karte hain.

Life Cycle (Jeevan Chakra)

• Har living being ka ek life cycle hota hai, jismein woh birth se lekar death tak various stages se guzarta hai.
• Stages: Birth → Growth → Reproduction → Death.
• Yeh cycle species ki continuity maintain karta hai.

Seed germination woh process hai jismein ek seed ek naye plant mein develop hota hai. Iske liye kuch specific conditions ka hona bahut zaroori hai. Agar yeh conditions na milein, toh seed germinate nahi hoga.

Seed Germination ke Liye Zaroori Conditions:

1. Water (Pani):

• Seeds ko germinate hone ke liye water bahut zaroori hai.
• Water seed ke andar enter karta hai aur uske outer covering (seed coat) ko soft karta hai.
• Soft hone se seed coat break ho jaati hai aur andar ka tiny embryo bahar nikal pata hai.
• Water seed ke andar ke enzymes ko activate karta hai, jo stored food ko embryo ke liye digestible form mein convert karte hain.
• Water seed ke cells ko swell karta hai, jisse growth start hoti hai.

1. Air (Hawa):

• Seeds ko germination ke liye air (specifically oxygen) ki zaroorat hoti hai.
• Oxygen respiration ke liye essential hai, jisse seed ko grow karne ke liye energy milti hai.
• Soil particles ke beech mein jo spaces hote hain, unmein air present hoti hai, jise seeds absorb karte hain.
• Agar soil mein bahut zyada pani ho (waterlogging), toh air spaces fill ho jaate hain aur seeds ko sufficient air nahi mil paati, jisse germination ruk jaati hai ya seed mar jaata hai.

1. Suitable Temperature (Uchit Tapman):

• Har seed ke liye ek optimum temperature range hota hai jismein woh best germinate karta hai.
• Bahut zyada thanda ya bahut zyada garam temperature germination ko rok sakta hai ya slow kar sakta hai.
• Most seeds ke liye, moderate warm temperatures (20-30°C) best hote hain.

1. Light/Dark Conditions (Roshni/Andhera):

• Most seeds ko germination ke liye light ki zaroorat nahi hoti. Kuch seeds toh andhere mein hi germinate karte hain (jaise bean seeds).
• Lekin, germination ke baad, seedling ki further growth ke liye sunlight zaroori hoti hai (photosynthesis ke liye).
• Kuch seeds aise bhi hote hain jinhe germination ke liye light chahiye hoti hai (photoblastic seeds), aur kuch jinhe light nahi chahiye hoti (negatively photoblastic seeds).

Activity 10.2 se Observations (Bean Seeds Experiment):

• Pot A (Sunlight, No Water): No germination. Reason: Water absent.
• Pot B (Sunlight, Excess Water): No/Poor germination. Reason: Excess water means less air, seed cannot respire.
• Pot C (Dark, Moist Soil): Germination. Reason: Water aur air present, light ki zaroorat nahi.
• Pot D (Sunlight, Moist Soil): Best germination. Reason: All conditions (water, air, suitable temperature) present.

Conclusion: Seed germination ke liye water aur air (oxygen) sabse essential conditions hain. Light ki zaroorat usually nahi hoti, but growth ke liye baad mein chahiye hoti hai.

Plants living beings hain, aur jaise animals grow karte hain aur move karte hain, waise hi plants mein bhi growth aur movement hoti hai, bas unka tareeka alag hota hai.

Plants mein Growth:

• Plants continuously grow karte hain apni poori life mein, jabki animals ek certain age tak hi grow karte hain.
• Growth ka matlab hai size mein increase, naye leaves, branches, flowers aur fruits ka banna.
• Plants ki growth mainly tips of roots aur shoots par hoti hai.

Plants mein Movement:

• Animals ki tarah plants ek jagah se doosri jagah move nahi karte (sessile hote hain).
• Lekin, unke parts various stimuli ke response mein movement show karte hain. Is movement ko tropism kehte hain.

Types of Movement in Plants:

1. Phototropism (Light ke prati response):

• Shoots (stem aur leaves) hamesha light ki taraf grow karte hain. Yeh positive phototropism hai.
• Roots usually light se door grow karti hain (negative phototropism).
• Activity 10.3: Agar plant ko ek box mein rakha jaaye jismein sirf ek side se light aa rahi ho, toh shoot us light source ki taraf bend ho jaati hai.

1. Geotropism (Gravity ke prati response):

• Roots hamesha gravity ki taraf (neeche) grow karti hain. Yeh positive geotropism hai.
• Shoots hamesha gravity ke against (upar) grow karte hain. Yeh negative geotropism hai.
• Activity 10.3: Agar plant ko inverted (ulta) rakha jaaye, tab bhi roots neeche ki taraf aur shoots upar ki taraf grow karenge.

1. Hydrotropism (Water ke prati response):

• Roots hamesha water ki taraf grow karti hain, taaki water absorb kar sakein. Yeh positive hydrotropism hai.

1. Thigmotropism (Touch ke prati response):

• Kuch plants, jaise climbers (belen), support ke around wind karte hain. Yeh touch stimulus ka response hai.
• Chhui-mui plant ke leaves touch karne par fold ho jaate hain, yeh bhi thigmotropism ka example hai.

1. Nastic Movements:

• Yeh movements stimuli ki direction par depend nahi karte.
• Example: Flowers ka open aur close hona (jaise morning glory morning mein open hota hai aur evening mein close), ya insectivorous plants ka insects ko trap karna (jaise Drosera ke sticky leaves).

Activity 10.3 se Conclusions:

• Plants ke shoots hamesha upar ki taraf aur light ki taraf grow karte hain.
• Plants ki roots hamesha neeche ki taraf (gravity ki direction mein) grow karti hain.
• Yeh movements plants ko survival mein help karte hain – light for photosynthesis, water aur minerals from soil.

Har living organism ki tarah, plants ka bhi ek life cycle hota hai. Yeh ek sequence of stages hai jo ek plant apni poori life mein complete karta hai, starting from a seed aur end mein naye seeds produce karna.

Plant Life Cycle ke Stages:

1. Seed (Beej):

• Life cycle seed se shuru hota hai. Seed ke andar ek tiny embryo hota hai, jismein future plant ki saari information hoti hai.
• Seed dormant state mein rehta hai jab tak usko favourable conditions (water, air, suitable temperature) nahi milte.

1. Germination (Ankuran):

• Favourable conditions milne par, seed germinate karta hai. Seed coat break hoti hai aur embryo grow karna shuru karta hai.
• Sabse pehle radicle (future root) bahar aati hai, jo neeche soil mein jaati hai water aur nutrients absorb karne ke liye.
• Phir plumule (future shoot) upar ki taraf grow karta hai, jo stem aur leaves banata hai.

1. Seedling (Naya Paudha):

• Germination ke baad, chhota plant seedling kehlata hai.
• Is stage mein, seedling apne leaves develop karta hai aur photosynthesis start karta hai, apna food khud banane ke liye.
• Roots soil mein deep jaati hain aur stem strong hota hai.

1. Mature Plant (Vyask Paudha):

• Seedling grow karke ek mature plant banta hai.
• Is stage mein plant full size attain kar leta hai aur flowers produce karta hai.
• Flowers plant ke reproductive parts hote hain.

1. Pollination aur Fertilization:

• Flowers mein pollination hota hai, jismein pollen grains ek flower se doosre flower tak transfer hote hain.
• Pollination ke baad fertilization hota hai, jisse ovules seeds mein develop hote hain aur ovary fruit mein develop hoti hai.

1. Fruit aur Seed Formation:

• Flowers fruits mein convert ho jaate hain, aur fruits ke andar seeds bante hain.
• Yeh seeds naye plants ko janm dene ki capacity rakhte hain.

1. Dispersal (Bikhrav):

• Fruits aur seeds various methods se disperse hote hain (wind, water, animals), taaki naye plants alag-alag jagahon par grow kar sakein.

1. Death:

• Ek certain period ke baad, plant ki life activities dheere-dheere band ho jaati hain aur plant mar jaata hai.
• Lekin, uske seeds naye plants ko janm de chuke hote hain, is tarah life cycle continue rehta hai.

Life Cycle ka Importance:

• Species ki continuity maintain karta hai.
• New generations produce karta hai.
• Ecosystem mein balance banaye rakhta hai.

Mosquitoes chhote insects hote hain jo humare aas-paas bahut common hain. Female mosquitoes blood suck karti hain aur dengue, malaria, chikungunya jaise diseases spread karti hain. Inka life cycle bahut interesting hota hai aur four distinct stages se guzarta hai.

Mosquito Life Cycle ke Stages:

1. Egg (Anda):

• Female mosquito stagnant water (ruke hue pani) mein eggs deti hai. Yeh eggs bahut chhote hote hain aur pani ki surface par float karte hain ya pani ke andar attach hote hain.
• Ek female mosquito ek baar mein 100-200 eggs de sakti hai.
• Eggs kuch ghanton se lekar kuch dinon mein hatch ho jaate hain, temperature par depend karta hai.

1. Larva (Larva):

• Egg se larva nikalta hai. Larvae worm-like creatures hote hain aur pani mein hi rehte hain.
• Inhe "wrigglers" bhi kehte hain kyunki yeh pani mein wiggle karte hain.
• Larvae pani mein present algae, bacteria aur other microorganisms ko feed karte hain.
• Inko air ki zaroorat hoti hai respiration ke liye, isliye yeh baar-baar pani ki surface par aate hain saans lene ke liye.
• Larval stage 4-14 din tak rehta hai, jismein yeh 4 times moult karte hain (skin shed karte hain) aur size mein badhte hain.

1. Pupa (Pupa):

• Larva grow karke pupa mein transform hota hai. Pupa bhi pani mein hi rehta hai.
• Inhe "tumblers" bhi kehte hain kyunki yeh pani mein tumble karte hain.
• Pupa non-feeding stage hai, matlab yeh kuch khata nahi hai. Is stage mein mosquito ke body parts develop hote hain.
• Pupa ko bhi air ki zaroorat hoti hai, isliye yeh bhi pani ki surface par aate hain.
• Pupal stage 2-3 din tak rehta hai.

1. Adult Mosquito (Vyask Mosquito):

• Pupa se ek fully developed adult mosquito bahar nikalta hai.
• Adult mosquito pani ki surface par thodi der rest karta hai aur phir ud jaata hai.
• Male mosquitoes plants ke nectar par feed karte hain, jabki female mosquitoes blood suck karti hain reproduction ke liye (eggs develop karne ke liye protein chahiye hota hai).
• Adult mosquito 10-15 din tak survive kar sakta hai.

Mosquito Breeding ko Control Kaise Karein?

• Mosquitoes ke life cycle ko break karne ka sabse effective tareeka hai stagnant water ko eliminate karna.
• Kyun? Kyunki eggs, larvae aur pupae saare stagnant water mein hi develop hote hain.
• Methods:
• Coolers, flower pots, old tyres, buckets mein pani jama na hone dein.
• Water tanks ko cover karke rakhein.
• Gaddhon mein pani jama na hone dein.
• Agar pani nikalna possible na ho, toh usmein kerosene oil ki thin layer daal sakte hain. Kerosene oil pani ki surface par ek layer bana deta hai, jisse larvae aur pupae ko air nahi mil paati aur woh mar jaate hain.

Frogs amphibians hote hain, matlab woh pani aur zameen dono par reh sakte hain. Inka life cycle bhi metamorphosis (roop parivartan) se guzarta hai, jismein yeh kai stages se hokar guzarne ke baad adult frog bante hain.

Frog Life Cycle ke Stages:

1. Eggs (Spawn):

• Female frog pani mein eggs ka cluster deti hai, jise spawn kehte hain. Yeh jelly-like substance se covered hote hain taaki protection mile.
• Eggs fertilization ke baad develop hona shuru karte hain.
• Yeh eggs pani mein plants par ya rocks par attach hote hain.

1. Embryo (Bhrun):

• Eggs ke andar embryo develop hota hai.
• Yeh stage bahut short hota hai.

1. Tadpole (Tadpole):

• Eggs se tadpole hatch hota hai. Tadpole ek choti fish jaisa dikhta hai, jiske paas tail hoti hai aur gills hote hain saans lene ke liye.
• Tadpoles puri tarah se aquatic (pani mein rehne wale) hote hain aur algae, plants par feed karte hain.
• Tail tadpole ko pani mein swim karne mein help karti hai.
• Dheere-dheere, tadpole ke hind legs (pichle pair) develop hona shuru hote hain, phir forelegs (agle pair) develop hote hain.
• Is stage mein gills disappear hone lagte hain aur lungs develop hote hain.

1. Froglet (Chhota Frog):

• Jab tadpole ke legs develop ho jaate hain aur tail choti hone lagti hai, toh use froglet kehte hain.
• Froglet ab pani ke saath-saath zameen par bhi rehna shuru karta hai.
• Is stage mein tail aur choti hoti jaati hai aur eventually disappear ho jaati hai.
• Lungs fully functional ho jaate hain.

1. Adult Frog (Vyask Frog):

• Tail poori tarah se disappear hone ke baad, froglet ek adult frog mein transform ho jaata hai.
• Adult frogs carnivorous hote hain aur insects ko feed karte hain.
• Yeh pani aur zameen dono par reh sakte hain (amphibious).
• Adult frogs reproduce karke naye eggs dete hain, aur life cycle continue rehta hai.

Metamorphosis ka Importance:

• Metamorphosis animals ko alag-alag environments mein survive karne mein help karta hai (tadpole pani mein, adult frog pani aur zameen dono par).
• Yeh food competition ko bhi kam karta hai kyunki young ones aur adults alag-alag food sources use karte hain.

Mosquito aur Frog Life Cycle mein Similarities aur Differences:

• Similarities: Dono mein eggs hote hain, dono ke life cycle mein aquatic stages hote hain, aur dono metamorphosis se guzarte hain.
• Differences: Stages ki sankhya aur unka appearance alag hota hai. Mosquitoes mein larva aur pupa stages hote hain, jabki frogs mein tadpole aur froglet stages hote hain. Mosquitoes insects hain, frogs amphibians.