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The pollen tubes grow through the soli...

The pollen tubes grow through the solid style by separating their cell through the secretion of

A

lipase

B

protease

C

amylase

D

pectinase

Text Solution

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The correct Answer is:
D
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Two cells of 6 V and 4 V having internal resistance of 3 Omega and 2 Omega respectively are connected in parallel so as to send a current through an external resistance 8 Omega in the same direction. Find the current through the cells and the current through the external resistance.

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

(a) Draw a diagrammatic sectional view of a mature anatropous ovule and label the following parts in it : (i) that develops into seed coat. (ii) that develops into an embryo after fertilization. (iii) that develops into an endosperm in an albuminous seed. (iv) through which the pollen tube gains entry into the embryo sac. (v) that attaches the ovule to the placenta.

TRUEMAN BIOLOGY-SEXUAL REPRODUCTION IN FLOWERING PLANTS-MULTIPLE CHOICE QUESTIONS
  1. Upon fertilization, while ovule develops into seed, what structure dev...

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  2. The process whereby the male gametes are brought to the egg by a poll...

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  3. The pollen tubes grow through the solid style by separating their ce...

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  4. External water is not required for fertilization of

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  5. In angiosperms, triple fusion produces

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  6. In angiosperm, syngamy or true fertilization refers to

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  7. Movement of pollen tube towards embryo sac is

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  8. Germination of pollen grain on the stigma is

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  9. At the time of entering embryo sac the pollen tube contains

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  10. Doubles fertilization is fusion of

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  11. Route used by pollen tube for entering ovule is

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  12. Write the significance of double fertilization.

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  13. The second fertilization in angiosperms is known as

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  14. Entry of pollen tube through micropyte while reaching the embryo sac...

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  15. When pollen tube enters by integuments then the process is called

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  16. In angiosperms, pollen tube liberates its male gamets into:

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  17. Total number of nuclei involved in double fertilization is

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  18. Pollen tube enters the embryo sac usually

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  19. Development of embryo in angiosperm is

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  20. The wheat grain/maize grain has an embryo with one, large, shield shap...

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