Which of the following statements about double fertilization are true? Select all that apply. a. One sperm fuses with an egg while the other sperm fuses with the polar nuclei. b. It results in the formation of a diploid embryo and triploid endosperm. c. Both sperms involved in double fertilization form within the same pollen tube. d. The diploid nucleus resulting from the second fertilization undergoes meiosis to form the endosperm. e. Two zygotes are formed, but only one survives.

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30-01-2020
Biology

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Which of the following statements about double fertilization are true? Select all that apply. a. One sperm fuses with an egg while the other sperm fuses with the polar nuclei. b. It results in the formation of a diploid embryo and triploid endosperm. c. Both sperms involved in double fertilization form within the same pollen tube. d. The diploid nucleus resulting from the second fertilization undergoes meiosis to form the endosperm. e. Two zygotes are formed, but only one survives.

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olatunbosunadeoke olatunbosunadeoke · Answer 1 · 2020-01-30T17:39:36+01:00

Answer: Only options A, B, C and D are true statements

A) One sperm fuses with an egg while the other sperm fuses with the polar nuclei.

B) It results in the formation of a diploid embryo and triploid endosperm.

C) Both sperms involved in double fertilization form within the same pollen tube.

- The diploid nucleus resulting from the second fertilization undergoes meiosis to form the endosperm.

Explanation:

Double fertilization is a process that occurs in only flowering plants. It involves the following:

- A pollen grain produces TWO male gametes

- one male gamete fertilize the egg to form a zygote that is DIPLOID (with two basic sets of chromosomes)

- the second male gamete fuses with another cell named POLAR NUCLEI, to form endosperm (the food storing tissue) in the seed. The endosperm formed is TRIPLOID ( it has three sets of chromosomes), having undergone reductive division - meiosis

Thus, the options A, B, C and D are true statements

Larus Larus · Answer 2 · 2021-11-23T13:34:51+01:00

In double fertilization, one sperm fuses with an egg and the other one amalgamates with the polar nuclei. In double fertilization, formation of a diploid embryo and triploid endosperm takes place, and both the sperms taking part in the process comes from the same pollen tube.

• A complex fertilization mechanism taking place in angiosperms or the flowering plants is termed as double fertilization.

• In the process, the embryo sac fuses with the two male gametes or the sperms.

• In flowering plants, post penetration, the pollen tube discharges two sperm into the embryo sac, where one combines with the egg, and give rise to zygote, while the other sperm combines with the two polar nuclei of the central cell and produces a triple fusion or endosperm.

• As in this, the true fertilization is followed by another fusion process that resembles fertilization, the process is termed double fertilization.

• The haploid egg and the haploid sperm joins to produce a diploid zygote, the phenomenon is termed syngamy.

• The other sperm and the two haploid polar nuclei joins to produce a triploid nucleus, known as triple fusion, which divides mitotically to give rise to endosperm.

Thus, the correct options are a, b and c.

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