Home
Class 12
BIOLOGY
Read the statement and answer the questi...

Read the statement and answer the questions that follow:
A flower of brinjal has 520 ovules in its ovary. However, it produces a fruit with only 480 viable seeds.
a) Describe the development of a dicot embryoy in a viable seed
b) Why certain angiospermic seeds are albuminous while others are exalbuminous? Explain.

Text Solution

Verified by Experts

a) A typical dicotyledonous embryo, consists of an embryonal axia and two cotyledons. The portion of embryonal axis above the level of cotyledons is the epicotyl, which terminates with the plumule or stem tip.
The cylindrical portion below the level of cotyledons is hypocotyl that terminates at its lower end in the radicle or root tip. The root tip is covered with a root cap.
b) The cotyledons of the embryo are simple structures, generally thick and swollen due to storage of food resves (as in legumes) mature seeds may be non-albuminous or ex-albuminous. Non-albuminous seeds have no residual endosperm as its is completely consumed during embryo development (e.g. pea, groundnut).
Albuminous seeds retain a part of endosperm as it is not completely used up during embryo development (e.g. wheat, maize, barley, castor).
Doubtnut Promotions Banner Mobile Dark
|

Topper's Solved these Questions

  • XII BOARDS

    XII BOARD PREVIOUS YEAR PAPER ENGLISH|Exercise DELHI BOARD- SET-III (SECTION-B)|2 Videos

  • XII BOARDS

    XII BOARD PREVIOUS YEAR PAPER ENGLISH|Exercise Section A|23 Videos

  • XII BOARDS

    XII BOARD PREVIOUS YEAR PAPER ENGLISH|Exercise SECTION -C|50 Videos

  • SAMPLE PAPER 2019

    XII BOARD PREVIOUS YEAR PAPER ENGLISH|Exercise Section E Part B|3 Videos

Similar Questions

Explore conceptually related problems

Read the following statement and answer the questions that follows: "A guava fruit has 200 viable seeds.". a) What are viable seeds? b) Write the total number of: i) Pollen grains , ii) Gametes in producing 200 viable guava seeds. c) Prepare a flow-chart to depict the post-pollination events leading to viablle-seed production in a flowering plant.

Read the passage given below, and answer the questions that follow: Some students wanted to investigate the pattern of inheritance of flower colour in snapdragon. They selected some plants which were homozygous for red flowers and some other plants which were homozygous for white flowers. These plants were labelled as Parental Plants (P_1) . These plants (red-flowered and white flowered), were cross-pollinated. The seeds obtained from these plants were planted in a separate field. These seeds germinated to produce the plants which were labelled as the plants of F_1 -generation. Based on the above experiment, answer the following questions: If the plants of F_1 -generation are allowed to self-pollinate, then in F_2 -generation.

Knowledge Check

  • Read the passage given below, and answer the questions that follow: Some students wanted to investigate the pattern of inheritance of flower colour in snapdragon. They selected some plants which were homozygous for red flowers and some other plants which were homozygous for white flowers. These plants were labelled as Parental Plants (P_1) . These plants (red-flowered and white flowered), were cross-pollinated. The seeds obtained from these plants were planted in a separate field. These seeds germinated to produce the plants which were labelled as the plants of F_1 -generation. Based on the above experiment, answer the following questions: This type of inheritance can be described as:

    A
    Polygenic inheritance
    B
    Incomplete dominance
    C
    Co-dominance
    D
    Pleiotropism

  • Read the passage given below, and answer the questions that follow: Some students wanted to investigate the pattern of inheritance of flower colour in snapdragon. They selected some plants which were homozygous for red flowers and some other plants which were homozygous for white flowers. These plants were labelled as Parental Plants (P_1) . These plants (red-flowered and white flowered), were cross-pollinated. The seeds obtained from these plants were planted in a separate field. These seeds germinated to produce the plants which were labelled as the plants of F_1 -generation. Based on the above experiment, answer the following questions: Select the statement which correctly predicts the phenotype of the plants of F_1 generation.

    A
    All the plants will bear red flowers
    B
    All the plants will bear white flowers
    C
    50% plants will bear red flowers and 50% will bear white flowers
    D
    100% plants will bear pink flowers.

  • Read the passage given below, and answer the questions that follow: Some students wanted to investigate the pattern of inheritance of flower colour in snapdragon. They selected some plants which were homozygous for red flowers and some other plants which were homozygous for white flowers. These plants were labelled as Parental Plants (P_1) . These plants (red-flowered and white flowered), were cross-pollinated. The seeds obtained from these plants were planted in a separate field. These seeds germinated to produce the plants which were labelled as the plants of F_1 -generation. Based on the above experiment, answer the following questions: The genotypic ratio of the plants of F_2 -generation will be:

    A
    `1:2:3`
    B
    `9:3:3:1`
    C
    `1:2:1`
    D
    `3:1`

    • Similar Questions

    Explore conceptually related problems

    (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) Why does endosperm development precede development in angiosperm seeds? State the role of endosperm in mature albuminous seeds. b) Describe with the help of three labelled diagrams the different embryonic stages that include mature embryo of dicot plants.

    Read the following statements (a) Angiosperms range in size from microscopic Wolffia to tall trees of Eucalyptus (b) In angiosperms, the seeds are enclosed by fruits (c ) Double fertilization is an event unique to angiosperms (d) In angiosperms, each cell of embryo sac is diploid (e) In angiosperms, the zygote develops into an endosperm Of the above statements, the correct ones are

    Read the passage given below, and answer the questions that follow: Some students wanted to investigate the pattern of inheritance of flower colour in snapdragon. They selected some plants which were homozygous for red flowers and some other plants which were homozygous for white flowers. These plants were labelled as Parental Plants (P_1) . These plants (red-flowered and white flowered), were cross-pollinated. The seeds obtained from these plants were planted in a separate field. These seeds germinated to produce the plants which were labelled as the plants of F_1 -generation. Based on the above experiment, answer the following questions: The biological name of snapdragon is:

    Home
    Profile