Tag: pre fertilization - plants

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Multiple choice botany modes of reproduction introduction to flower pre fertilization - plants sexual reproduction in flowering plants the origin of cells and cell division

The process of carrying of male gametes near female gametes by pollen tube is known as

  1. Porogamy

  2. Chalazogamy

  3. Siphonogamy

  4. Mesogamy
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Siphonogamy is the condition in plants in which pollen tubes are developed for the transfer of the male cells to the eggs. The seed plants are termed as siphonogamous. As a consequence, the spermatophytes are called as siphonogamous by some botanists. Syngamy is the fusion of gametes producing in the formation of a zygote, which develops into a new organism. 

Porogamy is the entrance of the pollen tube in the seed plants through the micropyle. Whereas Chalazogamy is the process of fertilization in which the pollen tube penetrates to the embryo sac.

Therefore, the correct answer is option C.

Multiple choice botany modes of reproduction introduction to flower pre fertilization - plants sexual reproduction in flowering plants the origin of cells and cell division

Entry of pollen tube into ovule through chalaza was first discovered by Treub in a xerophyte. The plant is associated with a pair of characters(i) Unisexual flowers (ii) Sessile flowers (iii) Centripetal arrangement of flowers (iv) Bisexual flowers. The correct pair is?

  1. ii and iii

  2. iii and iv

  3. ii and iv

  4. i and ii
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The entry of the pollen tube into the ovule through the chalaza is known as the chalazogamy. This was discovered by Treub. One such example of xerophyte is Casuarina, which is a plant which can withstand prolonged periods of drought. A flower is a bracteate, bracteolate, sessile, incomplete and unisexual.

Thus, the correct option is D.

Multiple choice botany modes of reproduction introduction to flower pre fertilization - plants sexual reproduction in flowering plants the origin of cells and cell division

Movement of pollen tube towards ovule is

  1. Chemotropism

  2. Haptotropism

  3. Thigmotropism

  4. Phototropism
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Chemotropism is the directional growth movement in response to external chemical stimuli. Movement of pollen tube towards ovule is chemotropic movement. Haptotropism is the growth movement of plant part in response to the touch stimuli. Thigmotropism is the growth movement in response to the touch. Phototropism is the growth movement of plant part in response to the light.

Thus, the correct answer is 'Chemotropism'.

Multiple choice botany modes of reproduction introduction to flower pre fertilization - plants sexual reproduction in flowering plants the origin of cells and cell division

The most common type of tapetum is?

  1. Secretary or glandular type

  2. Amoeboid or invasive type

  3. Nonglandular and noninvasive type

  4. Resupinate type
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Amoeboid or Invasive is also known as Periplasmodial Tapetum. It is the most common type of tapetum in the angiosperms. This type of tapetum can be seen in Alisma, Butomus, Tradescantia and Typha, etc. The tapetal cells fuse among themselves to make the tapetal periplasmodium. The protoplast of the fused tapetal cells then moves into the locule. This protoplast movement into the locule, may take place during meiotic prophase.

Thus the correct option is B.

Multiple choice botany modes of reproduction introduction to flower pre fertilization - plants sexual reproduction in flowering plants the origin of cells and cell division

Growth of pollen tube is?

  1. Apical

  2. Basal

  3. Intercalary

  4. Diffused
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

After the germination of pollen grains on stigma pollen tube is produced through a germ pore . Pollen tube grows chemotropically through the tissue of stigma and style in response to sugary fluid.

No intercalary meristem is present so pollen tube cannot exhibit intercalary growth , because of chemical stimulus pollen tube grows apically and not basally or diffused. 
So the correct option is ‘apical’                               

Multiple choice botany modes of reproduction introduction to flower pre fertilization - plants sexual reproduction in flowering plants the origin of cells and cell division

Fertilization which involves carrying male gametes by pollen tube is called

  1. Porogamy

  2. Siphonogamy

  3. Chalazogamy

  4. Syngonogamy
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The process fertilization accomplished by means of pollen tube in which the transfer of male gametes to the female gametes takes place.

So the correct option is 'Siphonogamy'.

Multiple choice botany modes of reproduction introduction to flower pre fertilization - plants sexual reproduction in flowering plants the origin of cells and cell division

In mesogamy, pollen tube enters the ovule through

  1. Middle of integuments after piercing the tissues

  2. Middle of integuments without piercing the tissues

  3. Chalaza

  4. Middle of micropyle
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
Mesogamy is the entry of pollen tube in the ovule through the integuments. The pollen tube enters the ovule laterally through integuments by piercing the tissue in the middle and finally enters the embryo sac through micropylar pole, whereas, entry of pollen tube through chalaza is called chalazogamy and through micropyle is called porogamy.
So, the correct answer is A.