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Development of a mature plant a zygote (...

Development of a mature plant a zygote (ferilized egg) follow a precise and highly ordered succession of events.

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Animals in which development of zygote takes place outside the body of female parent and they lay fertilised/unfertilised eggs are called.

The diagram below represents the development of a human zygote fertilisation to the late blastocyst Select a correct statement from the following options.

Read the following statements and select the correct option br Statement I: Development of larvae of earthworm takes place inside cocoon. Br Statement Il: In earthworm, fusion of gametes and formation of zygote occurs inside cocoon

(a) Explain the events taking place at the time of fertilization of an ovum in a human female. (b) Trace the development of the zygote upto the implanation in the uterus. (c) Name and draw a labelled sectional view of the embryonic stage that gets implanted.

Which of the following plants is not present in order Gnetales?

(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. (b) Describe the characteristic features of wind pollinated flowers.

(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. (b) Describe the characteristic features of wind pollinated flowers.

(a ) Trace the development of megaspore mother cell up to the formation of a mature embryo-sac in a flowering plant. (b) Draw a labelled diagram of the structure of mature dicot embryo.

(a ) Trace the development ofmegaspore mother cell up to the formation of a mature embryo-sac in a flower ing plant. (b) Draw a labelled diagram of the structure of mature dicot embryo.

Give reasons why : (i) most zygotes in angiosperms divide only after certain amount of endosperm is formed. (ii) ground nut seeds are exalbuminous and castor seeds are albuminous. (iii) Micropyle remains as a small pore in the seed coat of a seed. (iv) integuments of an ovule harden and the water content is highly reduced,as. the seed matures. apple and cashew are not called true fruits.

ALLEN-PLANT GROWTH AND DEVELOPMENT-True and False
  1. All cell of a plant are descendents of the zygote.

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  2. The leaves, flowers and fruits of the same tree not only have limited ...

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  3. Development of a mature plant a zygote (ferilized egg) follow a precis...

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  4. Read the following statements and find out the INCORRECT statement. ...

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  5. Choose the correct or incorrect statement regarding given figure: ...

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  6. Water provides the medium for enzymatic activites needed for growth wh...

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  7. Assertion : Nutrients are required by plants for the synthesis of prot...

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  8. Auxin (IAA) was first isolated from

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  9. Spraying juvenile conifers with GA hastens the maturity period thus le...

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  10. Kinetin occur naturally in plants.

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  11. Natural cyitokinins are sytnhesised in regions where rapid cell diviso...

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  12. Ethylene is used to initiate flowering and for synchorinising fruit se...

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  13. Ethephon hastens fruit ripening in tomatoes and apples and accelerates...

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  14. ABA plays an important role in seed development, maturation and dorman...

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  15. Events like vernalization, flowering dormancy, seed germination and pl...

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  16. In certain plants relative duration of light and dark period plays a i...

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  17. Assertion : Vernalisation is the promotion of flowering by a period of...

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  18. Some varieties of wheat are known as spring wheat while others are cal...

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  19. Bennials are monocarpic plants that normally flower and die in the sec...

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  20. Effect of vernalisation can not be seen in sugarbeet, cabbages and car...

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