Tag: sexual reproduction in plants

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Questions Related to sexual reproduction in plants

Multiple choice biology the flower pollination and its types germination sexual reproduction in plants seed germination seeds - structure and germination

Root system grows from

  1. Embryo of seed

  2. Radicle of embryo

  3. Plumule of embryo

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

Roots system develops from the radicle of the embryo because in seed, the radicle grows downward into the soil to absorb water and nutrients from the soil.

So, the correct option is 'Radicle of embryo'.

Multiple choice biology the flower pollination and its types germination sexual reproduction in plants

............. is not unisexual flower.

  1. Coconnut

  2. Papaya

  3. Gulmohar

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

The flowers wherein both the sex-organs, that is, the stamen and the pistil are present is called the bisexual or the hermaphroditic flowers. Those flowers wherein, only one of the sex-organ is present and the other is rudimentary absent, are called uni-sexual flowers. These can be pistillate when only pistil is present and can be staminate when only stamen is present.

Gulmohar is not unisexual. It is a bisexual flower.
So, the correct answer is 'Gulmohar'

Multiple choice biology reproduction in living organisms growth and development in plants sexual reproduction in plants post fertilization - plants

Mature ovary forms the

  1. Seed

  2. Stamen

  3. Pistil

  4. Fruit
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Fruits are formed by the maturation of one or more ovary. Fruits contain seeds resulting from the maturation of fertilized ovules. However, maturation of seed and fruit can occur in the absence of fertilization. In fleshy fruits, the outer covering is called as pericarp. Pericarp is again made of three layers, the epicarp, which is the outermost layer; the mesocarp, which is the middle layer; and the endocarp, which is the inner layer surrounding the ovary or the seeds. 

So, the correct answer is option D.

Multiple choice biology reproduction in higher plants growth and development in plants sexual reproduction in plants post fertilization - plants

Which of the following is a post fertilisation event in flowering plants?

  1. Transfer of pollen grains

  2. Embryo development

  3. Formation of flower

  4. Formation of pollen grains
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
Events in sexual reproduction after the fertilisation are called post-fertilisation events. After fertilisation, a diploid zygote is formed in all sexually reproducing organisms. The process of development of embryo from the zygote is called embryogenesis.
So, the correct answer is 'Embryo development'.
Multiple choice biology reproduction in higher plants growth and development in plants sexual reproduction in plants post fertilization - plants

In angiosperms, normally after fertilisation.

  1. The zygote divides earlier than the primary endosperm nucleus

  2. The primary endosperm nucleus divides earlier than the zygote

  3. Both the zygote and primary endosperm nuclei divide simultaneously

  4. Both the zygote and primary endosperm nuclei undergo a resting period
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Endosperm is the nutritive tissue for the developing embryo and the seedlings. In angiosperm, the endosperm develops from triploid primary endosperm nucleus which is formed as a result of vegetative fertilization, triple fusion or fusion of male gamete with the secondary nucleus of the central cell. Generally, endosperm divides before zygote because it will provide nourishment to the developing zygote.

So, the correct option is 'The primary endosperm nucleus divides earlier than the zygote'

Multiple choice biology reproduction in living organisms growth and development in plants sexual reproduction in plants post fertilization - plants

In angiosperms, triple fusion is required for formation of

  1. Embryo

  2. Endosperm

  3. Suspensor

  4. Fruit wall
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
Angiosperms have a unique phenomenon of double fertilisation in which after the release of two male gametes inside the embryo sac by the pollen tube, one male gamete (first male gamete which is closest to the egg) fuses with egg nucleus and this phenomenon is known as fertilisation or syngamy and results in the formation of zygote.
The other male gamete i.e. the second male gamete migrates towards the secondary nucleus (formed from fusion of two polar nuclei) and fuses with it. This phenomenon is known as triple fusion and results in the formation of a triploid primary endosperm mother cell. Primary endosperm mother cell then undergoes further divisions to form endosperm. Hence, triple fusion is required for the formation of endosperm.
So, the correct answer is B.
Multiple choice biology reproduction in living organisms growth and development in plants sexual reproduction in plants post fertilization - plants

The wheat grain is a

  1. Fruit

  2. Seed

  3. Embryo

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

Wheat is a grain, which belongs to the grass family Poaceae or Gramineae. Wheat grain is a fruit (Caryopsis) that produces a dry edible seed which is commonly known as the kernel. Wheat grain is a small edible fruit, usually hard on the outside. Corn, grain sorghum, rice, oats, and rye are other examples of grains.

So, the correct answer is 'Fruit'.

Multiple choice biology reproduction in higher plants growth and development in plants sexual reproduction in plants post fertilization - plants

To form 100 angiosperm seeds, how many mitosis are required?

  1. 300

  2. 200

  3. 500

  4. Can't say
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

For the formation of male gametophyte, 1 meiosis and 2 mitoses are required.

and for the formation of female gametophyte 1 meiosis and 3 mitoses are required. 
One angiosperm seed contains 1 male gametophyte and 1 female gametophyte.
So, to produced 1 angiosperm seed 2+3=5 mitosis will be required.
Thus, to produce 100 angiosperm seeds, 100X5=500 mitosis will be required
S.o the correct option is '500'.