Tag: angiosperms

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Questions Related to angiosperms

Multiple choice biology plant kingdom alternation of generation in angiosperms alternation of generation angiosperms

Gametophyte self incompatibility does not differ from saprophytic self incompatibility in that.

  1. There is co dominance of self incompatibility alleles
  2. Both give $50\%$ functional. Pollen in pollinations on some other plants

  3. There is breakdown of incompatibility on induction of polyploidy

  4. There is complete failure of seed set on self pollination
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Both gametophytic and sporophytic self-incompatibility systems involve the interaction of alleles that prevent self-fertilization, and both can be overcome by polyploidy, which often leads to the breakdown of the incompatibility reaction.

Multiple choice biology plant kingdom alternation of generation in angiosperms alternation of generation angiosperms

Read the given paragraph.
Where there is alternation of generations, the haploid multicellular plant is called a   (i)   and the diploid multicellular plant is called   (ii)   .    (iii)   generation is the dominant phase in algae showing haplontic type of life cycle. Bryophytes and pteridophytes usually possess    (iv)   types of life cycle.
Select the correct sequence of terms to complete the above paragraph.

  1. (i)-Sporophyte, (ii)-Gametophyte, (iii)-Gametophyte, (iv)-Diplontic

  2. (i)-Gametophyte, (ii)-Sporophyte, (iii)-Sporophyte, (iv)-Haplontic

  3. (i)-Sporophyte, (ii)-Gametophyte, (iii)-Sporophyte, (iv)-Haplodiplontic

  4. (i)-Gametophyte, (ii)-Sporophyte, (iii)-Gametophyte, (iv)-Haplodiplontic
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

In alternation of generations, the haploid plant is the gametophyte and the diploid is the sporophyte. Algae showing haplontic cycles have a dominant gametophyte. Bryophytes and pteridophytes exhibit a haplodiplontic life cycle.

Multiple choice biology plant kingdom alternation of generation in angiosperms alternation of generation angiosperms

Read the given statements and select the correct option. 
Statement 1 : Bryophytes show alternation of generation.
Statement 2 : A haploid gametophytic generation and a diploid sporophytic generation alternate in the life cycle.

  1. Both statements 1 and 2 are correct.

  2. Statement 1 is correct but statement 2 is incorrect.

  3. Statement 1 is incorrect but statement 2 is correct.

  4. Both statements 1 and 2 are incorrect.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Following are the correct statements: 

(i) Bryophytes show alternation of generation.
(ii) A haploid gametophytic generation and a diploid sporophytic generation alternate in the life cycle.
So, the correct answer is (a).

Multiple choice biology plant kingdom alternation of generation in angiosperms alternation of generation angiosperms

In moss,antheridia and archegonia occur at the tips of two different branches of the same plant.The condition is called

  1. Monoecious and autoecious

  2. Monoecious and paroicous

  3. Monoecious and synoicous

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

In mosses, when antheridia and archegonia are on different branches of the same plant, the condition is monoecious (since both sexes are on one plant) and specifically paroicous (if they are on the same branch) or autoecious (if on different branches). Given the options, 'monoecious and paroicous' is the standard classification for this specific arrangement.

Multiple choice biology plant kingdom alternation of generation in angiosperms alternation of generation angiosperms

Which of the following is a diploid?

  1. Capsule of moss

  2. Gametophyte. archegonia and egg of moss

  3. Gametophyte, antheridia and sperm of moss

  4. Gametophyte and spore of moss
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Mosses have neither pollen nor flowers and rely on water to carry the male gametes (the sperm) to the female gametes (the eggs). The spore capsules are produced after the sperms have fertilized the eggs. As they are produced after fertilisation, these spore capsules are diploid.

So, the correct option is 'Capsule of moss'.

Multiple choice biology plant kingdom alternation of generation in angiosperms alternation of generation angiosperms

Which one has the larges gametophyte?

  1. Cycas

  2. Angiosperm

  3. Selaginella

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

In bryophytes and pteridophytes and gymnosperms the male and female gametophytes to not have an independent free-living existence. They remain within the sporophyte. The gametophytes are quite large in Bryophytes as compared to other phyla like pteridophytes or angiosperms.

So, the correct option is 'Moss'

Multiple choice botany plant biology introduction to angiosperms phanerogams angiosperms

In angiosperms, the chalazal megaspore undergoes mitosis how many times?

  1. Never

  2. Twice

  3. Thrice

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

In angiosperms, the functional megaspore (usually the chalazal one) undergoes three successive rounds of free-nuclear mitotic divisions to form an 8-nucleate, 7-celled embryo sac. Therefore, it undergoes mitosis thrice.

Multiple choice botany plant biology introduction to angiosperms phanerogams angiosperms

Identify the incorrect statement.

  1. In over $60$ percent of angiosperms, pollen grains all shed at $2$-celled stage
  2. In less than $40$ percent species of angiosperms pollination occurs at $3$-celled stage of pollen grains

  3. Intine of pollen grain is made up of cellulose and pectin

  4. Pollen grains of a few species cause severe allergies and bronchial
Reveal answer Fill a bubble to check yourself
A Correct answer
Multiple choice botany plant biology introduction to angiosperms phanerogams angiosperms

What are cotyledons?

  1. They are the leaves of embryo.

  2. They are the leaves.

  3. They are the stems of embryo.

  4. None of the above.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Cotyledons are the leaves of embryo. Their number is either one or two. Sometimes, they store food materials and become fleshy.

Multiple choice botany plant biology introduction to angiosperms phanerogams angiosperms

Angiosperms were the first plants to have

  1. Petals

  2. Seed coats to protect seeds

  3. Fleshy fruit

  4. All of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
Angiosperms are the most advanced group of vascular plants. They are commonly called 'Flowering plants'. 
The most important feature in angiosperms is that they exhibit reproductive structures called flowers. The flowers contain certain structures arranged in four whorls. The outer whorls contain accessory structures such as sepals and petals and the two inner whorls containing essential structures such as stamens and carpels.
The stamens represent microsporophylls. Each stamen has an anther and a filament. The anther produces pollen grains containing the highly reduced male gametophyte. The carpels represent megasporophyll. They enclose ovules containing the egg cell which with the associated cells represent the female gametophyte.
A characteristic feature of angiosperms is the occurrence of a phenomenon called double fertilization one male gamete fuses with the egg cell to form a zygote while another male gamete fuses with a diploid secondary nucleus, to form a triploid endosperm (triple fusion). Following pollination and fertilization, the ovule transforms into the seed while the ovary that encloses the ovule transforms into the fruit. Thus, seeds are enclosed in fruits.