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[A]: Pollen grains from male parent are ...

[A]: Pollen grains from male parent are mostly transferred to the stigma in the female parent by some external ageincy.
[R]: This is because the male flowers or male organs have no intenal device to reach the female organs in another flower

A

If both A and R are true and R is the correct explanation of A

B

If both A and R are true but R is not the correct explanation of A

C

If A is true and R is false

D

If both A and R are false

Text Solution

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The correct Answer is:
A
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Fill in the blanks A flower may have either male or female reproductive parts. Such a flower is called______ .

Fill in the blanks The transfer of pollen grains from the anther to the stigma of the same or of another flower of the same kind is known as_______ .

Given below are a few statements related to external fertilization. Choose the correct statements: (i) The male and female gametes are formed and released simultaneously. (ii) Only a few gametes are released into the medium. (iii) Water is the medium in a majority of organisms exhibiting external fertilization. (iv) Offspring formed a a result of external fertilization have better chance of survival than those formed inside an organism

a] Draw a diagram of the longitudinal section of a flower and label on it sepal, petal, ovary and stigma. OR Draw the diagram showing the longitudinal section of a flower. Label the following parts : i] Style ii] Anther. b] Write the names of male and female reproductive parts of a flower.

Distinguish between unisexual and bisexual flowers giving one example of each. Draw a neat diagram showing fertilisation in a flower and label: a] Pollen tube b] Male germ cell c] Female germ cell, on it. OR Draw the diagram showing the germination of pollen on stigma and label the part on which pollination takes place. Answer the following questions based on diagram given aside. i] Name the part marked 'P. in the diagram. ii] How does 'P. reach part 'B'? iii] State the importance of the part 'C'. iv] What happens to the part marked 'D' after fertilisation is over? Mention the role of gamete and zygote in sexually reproducing organisms.

Give below are the events that are observed in an artificial hybridization programme. Arrange them in the correct sequential order in which they are followed in the hybridisation programme. (a) Re-bagging (b) Selection of parents (c ) Bagging (d) Dusting the pollen on stigma (e) Emasculation (f) Collection of pollen from male parent.

Read the following five statements (A to E) and select the option with all correct statement (A) Mosses and Lichens are the first organisms to colonise a bare rock. (B) Seloginella is a homosporous pteridophyte. (C) Coralloid roots in Cycas have VAM. (D) Main plant body in bryophytes is gametophytic whereas in pteridophytes it is sporophytic. (E) In Gymnoperms, male and female gametophytes are present within sporangla located on sporophyte.

TRUEMAN BIOLOGY-Plant Morphology & Reproduction -ASSERTION AND REASON
  1. [A]: The pollen sterility has been attributed to the malfunctioning of...

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  2. [A]: The three cells of the egg apparatus are arranged in a triangular...

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  3. [A]: Pollen grains from male parent are mostly transferred to the stig...

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  4. [A]: The two sperms cells in a pollen tube often change their shape. ...

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  5. [A] : Synandrous condition is found in curcurbits. [R] : The male fl...

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  6. [A]: In certain plants the stem that twins around the support is hard ...

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  7. [A]: Leaf in Daucus carota is decompound. [R]: Saprophytic and paras...

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  8. [A]: The colour of flowers in Bougainvillia is due to the coloured bra...

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  9. [A]: The endosperm contains the triploid number of chromosomes. [R]:...

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  10. [A]: Spore mother cells within the anther pollen sacs form four haploi...

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  11. [A]: One diploid embryo sac mother cell develops within the nucellus o...

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  12. [A]: Triple fusion results in veg~tative fertiliza- tion of angiosperm...

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  13. [A]: Pollination is essential for fertilization. [R]: Abscission or...

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  14. [A]: The biennial plants live for two years. [R]: They flower in bo...

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  15. Assertion : Many visitors to the hills suffer from skin and respirator...

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  16. [A]: Endosperm is tripolid in angiosperms. [R]: In gymnosperms, it ...

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  17. Assertion. A pollen grain of angiosperm is considered as the male game...

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  18. The number of antipodals cells in the matured embryo sac is

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  19. Assertion : In collateral vascular bundles phloem is situated toward ...

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  20. [A]: The secondary pholem consititutes a less poriment part of the tre...

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