Tag: seeds - structure and germination

Questions Related to seeds - structure and germination

Monocot seed generally shows

biology seeds - structure and germination germination seed germination the flower

  1. Epigeal germination

  2. Hypogeal germination

  3. Both A and B

  4. None of the above

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Correct Option: B
Explanation:

In hypogeal germination, the cotyledons do not come out of the soil surface. In such seeds, the epicotyl (i.e., part of the embryonic axis between plumule and cotyledons) elongates pushing the plumule out of the soil. All monocotyledons show hypogeal germination.

So the correct option is 'Hypogeal germination'.

Which one of the following is a monocotyledonous seed?

biology seeds - structure and germination germination seed germination the flower

  1. Bean

  2. Pea

  3. Maize

  4. Gram

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Correct Option: C

During germination, if the cotyledons are pushed above the soil, then such seeds are called

biology seeds - structure and germination germination seed germination the flower

  1. Epigeal

  2. Hypogeal

  3. Perigeal

  4. Progeal

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Correct Option: A

In pea, castor and maize ,the number of cotyledons are:

botany seeds - structure and germination what is a seed? seeds seed

  1. $2,2$ and $1$ respectively

  2. $1,2$ and $2$ respectively

  3. $2,1$ and $2$ respectively

  4. $1,2$ and $1$ respectively

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Correct Option: A

Coleorhiza and coleoptile are the protective sheaths covering _________ and _________ respectively.

botany seeds - structure and germination what is a seed? seeds seed

  1. Radicle, plumule

  2. Plumule, radicle

  3. Plumule, hypocotyl

  4. Epicotyl, radicle

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Correct Option: A

A plant bears fruit, has column of vascular tissue and a tap root system, This plant is a/an.

botany seeds - structure and germination what is a seed? seeds seed

  1. Angiosperm and dicot

  2. Gymnosperm and dicot

  3. Angiosperm and monocot

  4. None of the above

Show answer
Correct Option: A
Explanation:

Dicotylodoneae is a group of angiosperms that are characterized by tap root system, vascular tissue present in columns, posses xylem vessels, leaves have reticulate venation, stem with open collateral vascular bundles arranged in a ring and seed are covered by fruits and show secondary growth.

So the correct option is 'Angiosperms and dicot'

Coleoptile and coleorhiza are absent in?

botany seeds - structure and germination what is a seed? seeds seed

  1. Zea mays seed

  2. Triticum turgidum seed

  3. Gram seed

  4. More than one option is correct

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Correct Option: A

Perisperm differs from endosperm in  

botany seeds - structure and germination what is a seed? seeds seed

  1. Having no reserve food

  2. Being a diploid tissue

  3. Its formation by fusion of secondary nucleus with several sperms

  4. Being a haploid tissue

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Correct Option: B
Explanation:

Perisperm differs from endosperm in being a diploid tissue. Endosperm is a tissue produced inside the seeds of most flowering plants around the time of fertilization. It surrounds the embryo and provides nutrition in the form of starch, though it can also contain oils and protein. These are typically triploid but can vary widely from diploid. Endosperm that is diploid, resulting from the fusion of a pollen nucleus with one, rather than two, maternal nuclei.They are both nutritive layers in a seed. Perisperm develops from the nucellus of the seed and the endosperm develops when the sperm cell fuses with two haploid polar nuclei (contained in the central cell) in the centre of the embryo sac (or ovule). The resulting cell is triploid (3n). This triploid cell divides through mitosis and forms the endosperm, a nutrient-rich tissue, inside the seed. 

Which of the following is not a composite fruit? 

botany seeds - structure and germination what is a seed? seeds seed

  1. Ficus

  2. Pineapple

  3. Custard apple

  4. Jack fruit

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Correct Option: C
Explanation:

Composite fruit is a type of fruit that develops from an inflorescence rather than from a single flower while custard apple fruit develops from a polycarpellary and apocarpous ovary. It forms from the pistils and receptacle of one flower. Custard apple is an example of aggregate fruit.

Hence, the correct option is C.

Coir of coconut is obtained from

botany seeds - structure and germination what is a seed? seeds seed

  1. Endocarp

  2. Mesocarp

  3. Pericarp

  4. Placenta

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Correct Option: B
Explanation:

The coconut is also a drupe, but the mesocarp is fibrous or dry (termed a husk), so this type of fruit is classified as a simple dry fruit, fibrous drupe. Unlike other drupes, the coconut seed is unlikely to be dispersed by being swallowed by fauna, due to its large size. It can, however, float extremely long distances across oceans.

Thus, the correct answer is option B.