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why are antigen called antibody gernating chemical

Posted by Varun Dalhotra 7 years, 6 months ago

CBSE > Class 12 > Biology

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Paper level comp exam

Posted by Rajeev Singh 7 years, 6 months ago

CBSE > Class 12 > Biology

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How preparation for comp exam

Posted by Rajeev Singh 7 years, 6 months ago

CBSE > Class 12 > Biology

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Deepika Sharma 7 years, 6 months ago

Read only ncert book and solve mcq

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Scientic name of cat &dog

Posted by Arun Ambiger 7 years, 6 months ago

CBSE > Class 12 > Biology

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Sunanda Singh 7 years, 6 months ago

Scientific name or biological name of cat is Felis and that of dog is Canis

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Why did mendel choose pea as experimental materials

Posted by Vikash Punia 7 years, 6 months ago

CBSE > Class 12 > Biology

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Deepika Sharma 7 years, 6 months ago

1) it has many contrasting traits. 2) natural self pollination is present in pea plant. 3) pea plant is annual plant with short life cycle of 2-3 months so large no. Of offsprings can be analysed within a short period of time. 4) pea plant easy to cultivate. 5) cross pollination can be performed in it artificially so hybridization can be made possible.

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What is the life span of mango tree

Posted by Hariom Choudhary 7 years, 6 months ago

CBSE > Class 12 > Biology

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Sharvani Mishra 7 years, 6 months ago

300 years

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Explain back cross

Posted by Ganesh Patel 7 years, 6 months ago

CBSE > Class 12 > Biology

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Om Kunal 7 years, 6 months ago

The cross of F2 generation with any of its parent is called back cross

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Describe double fertilization in angiosperm

Posted by Mansi Jaiswal 7 years, 6 months ago

CBSE > Class 12 > Biology

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Hariom Choudhary 7 years, 6 months ago

After pollen is deposited on the stigma, it must germinate and grow through the style to reach the ovule. The microspores, or the pollen, contain two cells: the pollen tube cell and the generative cell. The pollen tube cell grows into a pollen tube through which the generative cell travels. The germination of the pollen tube requires water, oxygen, and certain chemical signals. As it travels through the style to reach the embryo sac, the pollen tube’s growth is supported by the tissues of the style. In the meantime, if the generative cell has not already split into two cells, it now divides to form two sperm cells. The pollen tube is guided by the chemicals secreted by the synergids present in the embryo sac, and it enters the ovule sac through the micropyle. Of the two sperm cells, one sperm fertilizes the egg cell, forming a diploid zygote; the other sperm fuses with the two polar nuclei, forming a triploid cell that develops into the endosperm.

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Why is gambisiil introduced into drains and ponds???

Posted by Kumar Rudra Prakash Mallick 7 years, 6 months ago

CBSE > Class 12 > Biology

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Why is it difficult to demarcate different phases of perennial plant

Posted by Ankur Malik 7 years, 6 months ago

CBSE > Class 12 > Biology

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Pseudostratified epithielium

Posted by Neha Banerjee 7 years, 6 months ago

CBSE > Class 12 > Biology

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What are cleistogamous flowers?

Posted by Shashank Yadav 7 years, 6 months ago

CBSE > Class 12 > Biology

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Sanjana Sabat 7 years, 6 months ago

The flowers which are closed such that their stamen and the pistil lie very close to each otherare called cheistogamous flower .In them the chances of cross pollination is not there.

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Some important projects topics for class 12

Posted by Jolly Nayak 7 years, 6 months ago

CBSE > Class 12 > Biology

1 answers

Ravneet Kaur 7 years, 6 months ago

Dna fingerprinting

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What is the importance of phpsphorous

Posted by Ankit Bubu 7 years, 6 months ago

CBSE > Class 12 > Biology

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oogenesis notes

Posted by Neha Kumari Mishra 7 years, 6 months ago

CBSE > Class 12 > Biology

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Does the egg get fertilised in the case of polyembryony? Is is a type of apomixis?

Posted by Debasmita Jamuda 7 years, 6 months ago

CBSE > Class 12 > Biology

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effect of mine rals ant fertilisation on the growth of plants

Posted by Nisha Bee 7 years, 6 months ago

CBSE > Class 12 > Biology

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What is Co dominance?

Posted by Shantanu Sonkar 7 years, 6 months ago

CBSE > Class 12 > Biology

1 answers

Priyanka Rani 7 years, 6 months ago

Appearance of both the characters in the new one

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What is

Posted by Tanish Mittal 7 years, 6 months ago

CBSE > Class 12 > Biology

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Explain 10 mmc are present in each microsporangia of saturated how many pollen grain formed in 1 flower

Posted by K Poonam 7 years, 6 months ago

CBSE > Class 12 > Biology

2 answers

Priyanka Rani 7 years, 6 months ago

Obviously 40

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Shubham Sharma 7 years, 6 months ago

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Why productivity is less in aquatic ecosystem than terrestrial ecosystem

Posted by Shreya Jadhav 7 years, 6 months ago

CBSE > Class 12 > Biology

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What is morbidity

Posted by Chetana Nijaguli 7 years, 6 months ago

CBSE > Class 12 > Biology

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Why ground nut is considered as a stem?

Posted by Sruti Dash 7 years, 6 months ago

CBSE > Class 12 > Biology

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What is the reproduction

Posted by Dakyam Tallang 7 years, 6 months ago

CBSE > Class 12 > Biology

1 answers

Anubhi Chauhan 7 years, 6 months ago

It is a biological process in which an organism give birth or rise to a young organism similar to itself.

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Which plant is called terror of bengal

Posted by Arvinder Kaur 7 years, 6 months ago

CBSE > Class 12 > Biology

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Deepika Sharma 7 years, 6 months ago

Water hyacinth

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Azmat Ali 7 years, 6 months ago

Water hyacinth

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Who is called as terror of bengal which plant

Posted by Arvinder Kaur 7 years, 6 months ago

CBSE > Class 12 > Biology

1 answers

Brijraj Yadav 7 years, 6 months ago

Water hyacinth

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What are blastomeres and what is the difference between blastomeres and morula

Posted by Ushnika Kar 7 years, 6 months ago

CBSE > Class 12 > Biology

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Rajnish Kunwar 7 years, 6 months ago

After fertilization cleavage taken plce result in formation of 2 4 8 16 cell called blastomers....their is not so difference btw blastomers or morula .....when cell no is 8 to 16 then we call this state of blastomers as morula......

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A chemical signal that has both endocrine and neural role

Posted by Diya Sharma 7 years, 6 months ago

CBSE > Class 12 > Biology