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1) because of presence of sporopollelin. 2) because pollen tablets comprises of nutritive components which is given to athletes or race horses to increase their performance

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Give reasons why Most zygotes in angiosperms divide only after certain amount of endosperm is formed. Groundnut seeds are exalbuminous and Caster seeds are albuminous. Micropyle remains as a small pore in the seed coat of a seed. Integuments of an ovule harden and the water content is highly reduced as the seed matures. Apple and Cashew are not called true fruits.

Posted by Rachita T 4 years, 8 months ago (3875802)

CBSE > Class 12 > Biology

0 answers

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Explain double fertilization and trace the post fertilization events in sequential order leading to seed formation in a typical dicotyledonous plant.

Posted by Rachita T 4 years, 7 months ago (3875802)

CBSE > Class 12 > Biology

1 answers

Sia ? 4 years, 7 months ago (6945213)

pollen grain contain two male gemetes one fuses with egg and another fuses with central cell to form primary endosperm nucleus , the whole process is known as doible fertilisation.
after double fertilisation primary enfosperm nucleus is converted inro primary endosperm cell which is ised as food for developing seed.

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How are seeds advantageous to flowering plants ?

Posted by Rachita T 4 years, 8 months ago (3875802)

CBSE > Class 12 > Biology

3 answers

Bishal Jyoti Baishya 4 years, 8 months ago (9486722)

It's provide endosperm , which provides nutrition to the embryo

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Rachita T 4 years, 8 months ago (3875802)

I don't think so....that I have repeated any of the question..

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Gaurav Bagga 4 years, 8 months ago (3086880)

Why ru repeating the same questions?

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Describe in sequence the events that lead to the development of a 3-celled pollen grain from microspore mother cell in angiosperms

Posted by Rachita T 4 years, 7 months ago (3875802)

CBSE > Class 12 > Biology

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ANSWER

Describe in sequence the events that lead to the development of a 3-celled pollen

Posted by Rachita T 4 years, 8 months ago (3875802)

CBSE > Class 12 > Biology

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ANSWER

How does pollen mother cell develop into a mature pollen grain ? Illustrate the stages a. with labelled diagrams

Posted by Rachita T 4 years, 7 months ago (3875802)

CBSE > Class 12 > Biology

1 answers

Sia ? 4 years, 7 months ago (6945213)

Pollen mother cells undergo meiosis to form a microspore tetrad (microspores arranged in a cluster of four cells) by the process called microsporogenesis.
- The microspores dissociate from each other and develop into pollen grains.
- The protoplast (pollen grain) then divides mitotically to form two unequal cells
- the bigger vegetative cell and smaller generative cell.

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Differentiate perisperm and endosperm giving one example of each .

Posted by Rachita T 4 years, 8 months ago (3875802)

CBSE > Class 12 > Biology

1 answers

Sia ? 4 years, 7 months ago (6945213)

Perisperm	Endosperm
Perisperm is the remnant of nucellus which are persistent. It encloses the embryo and provides nourishment to it in certain seeds.	Endosperm is the tissue formed after double fertilisation. It surrounds, stores food and provide nourishment to the embryo in an angiosperm seed.
It is diploid in nature.	It is triploid in nature because it is formed as a result of triple fusion.
Example- Black pepper	Example- Wheat

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How does geitonogamy differ from xenogamy

Posted by Rachita T 4 years, 8 months ago (3875802)

CBSE > Class 12 > Biology

1 answers

Gaurav Bagga 4 years, 8 months ago (3086880)

Geitonogamy is transfer of pollen grains from 1 flower to another flower of same plant. Genetically it is self pollination Xenogamy is transfer of pollen grains from one flower to another flower of different flower.

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Name the product of fertilization that forms the kernel of coconut. How does the a. Kernel differ from coconut water ? (a) Mention the similarity between autogamy and geitonogamy

Posted by Rachita T 4 years, 7 months ago (3875802)

CBSE > Class 12 > Biology

1 answers

Sia ? 4 years, 7 months ago (6945213)

The difference between kernel and coconut water is that kernel is the dried part of the coconut that can be eaten in soft or dried form. It is also used to make coconut oil. Coconut water is the byproduct of fertilization. It is the juice that is found inside the coconut. It is used as a drink.
Endosperm is a tissue that forms inside a seed in flowering parts after fertilization. It provides nutrition to the embryo and can also be the source of nutrition to other organisms.

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Write the cellular contents carried by the pollen tube. How does the pollen tube gain a. entry into the embryo sac ?

Posted by Rachita T 4 years, 7 months ago (3875802)

CBSE > Class 12 > Biology

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How does the study of different parts of a flower help in identifying wind as its pollinating agent ?

Posted by Rachita T 4 years, 7 months ago (3875802)

CBSE > Class 12 > Biology

1 answers

Sia ? 4 years, 7 months ago (6945213)

Wind pollination requires that the pollen grains are light and sticky.
The flowers often possess well-exposed stamen and large feathery stigma.
Wind-pollinated flowers have a single ovule in each ovary.
These flowers have small calyx and corolla.

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Explain the function each of 9a) Coleorhiza (b) Germ pores

Posted by Rachita T 4 years, 8 months ago (3875802)

CBSE > Class 12 > Biology

1 answers

Gaurav Bagga 4 years, 8 months ago (3086880)

Coleorhiza is a region below the level of cotyledons which gives rise to root tip. Intine extends as pollen tube from germ pores

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State one advantage and one disadvantage of cleistogamy.

Posted by Rachita T 4 years, 8 months ago (3875802)

CBSE > Class 12 > Biology

1 answers

Gaurav Bagga 4 years, 8 months ago (3086880)

Advantage Assures set of seed formation. Disadvantage Continuous self pollination leads to inbreeding depression.

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Where is sporollenin present inplants ?state its significance with reference to its a. chemical nature.

Posted by Rachita T 4 years, 8 months ago (3875802)

CBSE > Class 12 > Biology

2 answers

Bishal Jyoti Baishya 4 years, 8 months ago (9486722)

In the extine layer of Pollengrain. 1. It can withstand with high temperatures 2. No enzymes can degrade them 3. Most organic resistant with environmental factors.

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Gaurav Bagga 4 years, 8 months ago (3086880)

Baar baar ek hi sawal ka jawab nhi dunga

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Write a short note on Indian dociety?

Posted by Minlen Singsit 4 years, 7 months ago (11113285)

CBSE > Class 12 > Sociology

1 answers

Sia ? 4 years, 7 months ago (6945213)

Indian society is a pluralistic society with a complex social order characterised by a multitude of ethnic, linguistic, religious and caste divisions. Hindus constitute the majority community and comprise about 82% of the population. They stand evenly distributed across regions.

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Hello what is the definition of motion

Posted by Mr. Reader 4 years, 8 months ago (10418356)

CBSE > Class 09 > Science

5 answers

Saumya Rwt 4 years, 7 months ago (5748227)

A body is said to be in motion if it changes its position with respect of time

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Astha Pandey 4 years, 8 months ago (11108616)

Hii. The proper definition of a motion is In physics motion is the phenomenon in which an Object changes its position wrt time Or Motion is commonly, basically or defined as The motion is nothing but the change of position with respect to it time. For example:The moving blades of a fan Eg no 2. The moving of ?, ?and ???????etc.

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₹! &#! _@ ?? 4 years, 8 months ago (11103156)

A body is said to be in motion if it changes it's motion with respect time

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Prachi S 4 years, 8 months ago (11072565)

Hello A body is said to be in motion if it changes its position with respect to time

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Girdhar Arora 4 years, 8 months ago (11097806)

A body is said to be in motion if it changes its position with respect to time .

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1. Who hosted the congress of Vienna in 1815 (a) Cavour (b) King victor Emanuel (c) Bismarck (d) Duke Metternich 2. Who was Frederic sorrieu? (a) A Philosopher (b) A Painter (c) A Politician (d) A Revolutionaries 3. Why was the Napoleonic rule over other regions unpopular with some sections of Europe?

Posted by Zainul Abideen Aamiri 4 years, 8 months ago (9822179)

CBSE > Class 10 > Social Science

1 answers

Adithya Dev A 4 years, 8 months ago (10643926)

1. (d) Duke Metternich. 2. (b) A Painter. 3. In some areas like Brussels in Belgium, Warsaw in Italy, Mainz in Germany and Milan in France, the reactions of people were mixed about Napoleonic rule. Though all people considered Napoleon and his army initially as Harbingers of Liberty and Renaissance, the initial enthusiasm soon turned to hostility when the administrative measures didn't go hand in hand in Individual freedom. Increased taxation, censorship and forced conscription into Napoleonic armies started destroying Napoleon internally.

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Bama devi k mandir q gaye thi ? Aur usne Mandir me kya manga?

Posted by Jackquline Lakra 4 years, 8 months ago (7883017)

CBSE > Class 08 > हिंदी

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Paraya dhan by Munshi Premchand

Posted by Jackquline Lakra 4 years, 8 months ago (7883017)

CBSE > Class 08 > हिंदी

1 answers

Janvi Vyas 4 years, 8 months ago (9940269)

Hindi

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We see a variety of organisms around us. Some organisms exist but are not visible to us. Explain why?

Posted by Saumya Rwt 4 years, 8 months ago (5748227)

CBSE > Class 09 > Science

1 answers

Girdhar Arora 4 years, 8 months ago (11097806)

These are bacterias ,microorganism. They are very small that cannot be seen with naked eye so they are not directly visible to us.

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What were the changes that could be seen in Hamel after he came to know that french language will no longer be taught .??

Posted by Sneha Sao 4 years, 8 months ago (9557161)

CBSE > Class 12 > English Core

1 answers

Tec Om 4 years, 8 months ago (7036201)

In his last lesson, his changed attitude could be easily seen. He became very polite and generous. On usual days Mr. Hamel used to scold the students who were late but he had not scold Franz and also he used to rappel his ruler on the desk but these things were changed. His style of teaching was also changed. He became very emotional at the end of the class. He could not say even a single word, so he used his hand's gesture to indicate that the class was over.------------------if there is any mistake then please let me know----------.

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HCF of 12 18

Posted by Kajal Chouhan 4 years, 8 months ago (11110898)

ICSE & ISC > Class 06 > Mathematics