CBSE > Class 12 > Biology | CBSE Board | Homework Help

Yes this statement is true...bcz sexual reproduction doesn't produce indentical offspring which indeed results in variation n due to variation...some animal get adapted to environment in better way.which increases chances of survival

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Fertilisation in flowering plants

Posted by Kh Jerry Chinnunthang 8 years, 1 month ago

CBSE > Class 12 > Biology

0 answers

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Kya Kisi ne biology ki arihant ki book padi hai

Posted by Sheetal Wankhede 8 years, 1 month ago

CBSE > Class 12 > Biology

3 answers

Rida Khan 8 years, 1 month ago

Yes.. it's nyc ?

1Thank You

Sheetal Wankhede 8 years, 1 month ago

Abhi arihant se pad ke accha score kar sakte hai kya??

1Thank You

Annu Baghel 8 years, 1 month ago

Hmm, book achhi h

2Thank You

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What is tectum ?

Posted by Ankush Mlk 8 years, 1 month ago

CBSE > Class 12 > Biology

1 answers

Riya Mahesh 8 years, 1 month ago

Layer of pollen grain

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Study of mitosis in onion root tips diagram stages

Posted by Akanksha Singh 8 years, 1 month ago

CBSE > Class 12 > Biology

0 answers

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Define aneuploidy

Posted by Tannu Pal 8 years, 1 month ago

CBSE > Class 12 > Biology

2 answers

Tannu Pal 8 years, 1 month ago

Thnxx

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Shambhavi Singh 8 years, 1 month ago

When chromatid (thread like structure) fails to segregate during cell division ...it .results in either gain or loss of chromosomes . This is known as aneuploidy. For eg. down's syndrome

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Watage of all unit in exam

Posted by Madhur Choudhary 8 years, 1 month ago

CBSE > Class 12 > Biology

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Why prokaryotes are not group any trophic level by ecologist

Posted by Shobha Singh 8 years, 1 month ago

CBSE > Class 12 > Biology

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What is mean by eutrophication

Posted by Ramaneshwar Raj 8 years, 1 month ago

CBSE > Class 12 > Biology

1 answers

Shambhavi Singh 8 years, 1 month ago

Eutrophication is the natural ageing of lake or any aquatic body , by nutrient enrichment of its water. It happens as follows: Water in young lake is cold n clear to support life. With time,it gets accumulated with nutrients such as phosphorus n nitrogen by the means of streams. These serves as nutrients n flourish the growth of various types of benthic {bottom plants} as well as free floating plants. Then slowly n gradually due to the organic remains of plants n animals .,water becomes warmer and later it converts into swamp or marsh land.

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What is withdrawal syndrome

Posted by Shreyasi Samaddar 8 years, 1 month ago

CBSE > Class 12 > Biology

1 answers

Shambhavi Singh 8 years, 1 month ago

It is a situation when someone feels unpleasant ......., mentally n physically both. this happen when that person stop taking the thing for which he is addicted such as drug.

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A doctor prescribed morphine as sedative and painkiller to your cousin who had undergone surgery. Even after recovery he craved for the prescribed medicine .what do you conclude about his condition had he continued with the same medication ?after appraising yourself what measure s will you suggest to him to overcome this problem ? Briefly explain.

Posted by Nisha Nayak 8 years, 1 month ago

CBSE > Class 12 > Biology

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Wind pollinated flower?

Posted by Sourabh Pandey 8 years, 1 month ago

CBSE > Class 12 > Biology

1 answers

Vivek Saini 8 years, 1 month ago

Eg. Wheat

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Prawn?

Posted by Sourabh Pandey 8 years, 1 month ago

CBSE > Class 12 > Biology

1 answers

Vivek Saini 8 years, 1 month ago

Prawn is an aquatic organism

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Diplotene?

Posted by Sourabh Pandey 8 years, 1 month ago

CBSE > Class 12 > Biology

2 answers

Vidhi Rawat 8 years, 1 month ago

A stage in meiosis (prophase 1)

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Vivek Saini 8 years, 1 month ago

Yo konse chapter maa

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Cactus?

Posted by Sourabh Pandey 8 years, 1 month ago

CBSE > Class 12 > Biology

1 answers

Vivek Saini 8 years, 1 month ago

Cactus xeophytic plant h

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Prawn

Posted by Sourabh Pandey 8 years, 1 month ago

CBSE > Class 12 > Biology

1 answers

Vivek Saini 8 years, 1 month ago

Prawn aquatic organism h

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Ascaris?

Posted by Sourabh Pandey 8 years, 1 month ago

CBSE > Class 12 > Biology

1 answers

Vivek Saini 8 years, 1 month ago

Ascaris worm h

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Insect pollinated flower

Posted by Sourabh Pandey 8 years, 1 month ago

CBSE > Class 12 > Biology

3 answers

Prachi K 8 years, 1 month ago

Insect pollinated flower contain nector which cause pollination as insects come to suck nector pollen grain stick to insect and transfer it to another stigma

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Bhumi Jain 8 years, 1 month ago

Characteristics Large flowers with brightly colored petals to attract insects. Flowers are usually sweet smelling or fragrant with nectar present.

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Bhumi Jain 8 years, 1 month ago

Insect pollinated flowers rely on agents such as insects (e.g. bees, butterflies), birds (e.g. sunbird, hummingbird) for pollination to take place

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Why is 2°treatment of water in sewage treatment plant is called biological treatment

Posted by Bhumi Jain 8 years, 1 month ago

CBSE > Class 12 > Biology

2 answers

Divya Sen 8 years, 1 month ago

These microbes increases consumption of organic wastes and reduces BOD,hence 2º treatment is also called biological treatment.

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Divya Sen 8 years, 1 month ago

Because in 2ºtreatment, the organic matter present in the sewage water is consumed/decomposed by the aerobic microbes(by flocks-which grows after passing the 1º effluent into aeration tanks).

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Function of rDNA

Posted by James James 8 years, 1 month ago

CBSE > Class 12 > Biology

4 answers

Bhumi Jain 8 years, 1 month ago

Its my mistake...

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Prachi K 8 years, 1 month ago

Ulta sidha mat do reply bhumi ise better h Jake padh lo ch 11

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Prachi K 8 years, 1 month ago

rDNA as in replicating DNA which is cut and ejected in other's cell for different or improved product.. It is a part of biotechnology

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Bhumi Jain 8 years, 1 month ago

I think it is rRNA

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Why hemichordates were seperated from chordates

Posted by Ravinder Thakran 8 years, 1 month ago

CBSE > Class 12 > Biology

1 answers

Pranjali Mahajan 8 years, 1 month ago

Yaad hai par par yad nahi aa raha??

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What are algal bloom? And how they affect organism in water ?

Posted by Honey Mavi 8 years, 1 month ago

CBSE > Class 12 > Biology

1 answers

Prachi K 8 years, 1 month ago

Algal bloom is the excess increasment in the number of algae...it consume all oxygen present in the water and the rest aquatic organism die due to insufficient amount of oxygen

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Names of two dinosaurs that lived early in the history of Earth and two that lived little later

Posted by Ankit Chauhan Rajput 8 years, 1 month ago

CBSE > Class 12 > Biology