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Synergids are...

Synergids are

A

tetraploid

B

haploid

C

diploid

D

triploid

Text Solution

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The correct Answer is:
B
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Which of the following statements is/are correct ? (i) Endothecium lies below epidermis (ii) Fusion of egg with male gamete is called apogamy (iii) Synergids are haploid. (iv) The point at which funicle touches the ovule is raphe.

[A] : Synergids play an important role in directing the pollen tube growth . [R] : Because synergids secrete some chemotropically active substance .

(a) Draw a diagram of a mature embryo sac of an angiosperm and label the following parts in it : (i) Filiform apparatus (ii) Synergids (iii) Central cell (iv) Egg cell (v) Polar nuclei (vi) Antipodals (b) Write the fate of egg cell and polar nuclei after fertilization.

[A]: The three cells of the egg apparatus are arranged in a triangular fashion. [R): The degenerating synergid forms the seat for pollen tube discharge in the embryo sac

[A]: The two sperms cells in a pollen tube often change their shape. [R]: The sperms are released in the synergid as intact cells but only their nuclei migrate

What is the fate of the male gametes discharged in the synergid ?

In case of flowering plants, egg apparatus consists of egg and synergids.

Filiform apparatus is characteristic feature of : 1. generative cell 2. nucellar embryo 3. aleurone cell 4. synergids

[A]: Triple fusion results in veg~tative fertiliza- tion of angiosperms. [R]: It combines one male gamete with two synergids.

SANTRA PUBLICATION-REPRODUCTION IN ORGANISMS-Long answer type Questions
  1. Synergids are

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  2. Describe the alternation of generation in lower organism with schemati...

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  3. What is alternation of generation. What are the significance ?

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  4. What is micropropagation ? What are the characteristics and advantages...

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  5. Mention the advantages of sexual reproduction. State the differnce amo...

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  6. Describe briefly about the different types of vegetative reproduction.

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  7. Describe different types of asexual reproduction with proper diagramma...

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  8. Mention the basic features of reproduction. Describe about different s...

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  9. Describe briefly about different types of sexual reproduction .

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  10. What is parthenogenesis ? Describe about different types of parthenog...

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  11. Describe about different types of spores with their proper diagrammati...

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  12. State the different methodologies of Natural Vegetative propagation in...

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  13. What is grafting? Describe about the different techniques of grafting.

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  14. What are the advantages and disadvantages of vegetative propagation in...

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  15. Describe briefly the pre-fertilization events of sexual reproduction.

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  16. What is fertilization? Describe the different types of fertilization.

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  17. What are the advantages and disadvantages of sexual reproduction ?

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