Tag: angiosperms

Quizzes (1) Questions (200)

Questions Related to angiosperms

Multiple choice botany plant biology introduction to angiosperms phanerogams angiosperms

Endosperm cell of an angiosperm has $24$ chromosomes. The number of chromosomes in the gametes would be.

  1. $8$
  2. $16$
  3. $24$
  4. $48$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The endosperm in angiosperms is triploid (3n). If 3n = 24, then n = 8. Gametes are haploid (n), so they contain 8 chromosomes.

Multiple choice botany plant biology introduction to angiosperms phanerogams angiosperms

In angiosperms, a mature male gametophyte is formed from a pollen mother cell through.

  1. Two meiotic divisions

  2. Three mitotic divisions

  3. One meiotic and two mitotic division

  4. A single meiotic division
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Meiosis produces pollen grain. Its cell divides mitotically to form generative nucleus and tube cell. The generative nucleus undergoes another mitosis to form two male gametes.

So, the correct answer is 'One meiotic and two mitotic division'

Multiple choice botany plant biology introduction to angiosperms phanerogams angiosperms

In angiosperms, formation of two male gametes from a pollen grain involves - divisions.

  1. One mitotic and one mitotic

  2. Two meiotic and two mitotic

  3. Only two mitotic

  4. Only two meiotic
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The microspore nucleus undergoes one mitotic division to form the vegetative and generative cells. The generative cell then undergoes a second mitotic division to produce two male gametes. Thus, two mitotic divisions occur.

Multiple choice botany plant biology introduction to angiosperms phanerogams angiosperms

A natural sequence of developmental stages in the life cycle of an angiosperm is?

  1. Cleavage $\rightarrow$ Fertilization $\rightarrow$ Differentiation $\rightarrow$ Fruit formation
  2. Pollination $\rightarrow$ Fertilization $\rightarrow$ Seed formation $\rightarrow$ Germination
  3. Germination $\rightarrow$ Double fertilization $\rightarrow$ Endosperm formation $\rightarrow$ Seed dispersal
  4. Maturation $\rightarrow$ Mitosis $\rightarrow$ Differentiation $\rightarrow$ Fertilization
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The standard sequence in the angiosperm life cycle is pollination, followed by fertilization, which leads to seed formation, and finally germination of the seed.

Multiple choice botany plant biology introduction to angiosperms phanerogams angiosperms

Centrospermae is regarded a natural order of angiosperms. All except two of its families contain the pigments that are collectively called battalions. Some of the families of the order are enumerated below. Which two families lack betalains?
a. Amaranthaceae
b. Aizoaceae
c. Chenopodiaceae
d. Caryophyllaceae
e. Mouginaceae
Select the correct answer using the codes given.

  1. $1$ and $2$
  2. $2$ and $3$
  3. $3$ and $4$
  4. $4$ and $5$
Reveal answer Fill a bubble to check yourself
D Correct answer
Multiple choice botany plant biology introduction to angiosperms phanerogams angiosperms

In angiosperms, which one of the following processes does NOT involve an unequal division?

  1. Formation of microspores

  2. Formation of generative cell

  3. Zygotic embryogenesis

  4. Helobial endosperm development
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Microsporogenesis involves the formation of microspores from a microspore mother cell via meiosis, which results in four equal-sized haploid microspores. The other options involve unequal divisions (e.g., generative cell formation, zygote division).

Multiple choice botany plant biology introduction to angiosperms phanerogams angiosperms

In angiosperms during development of embryo, the suspensor cell develops from.

  1. Oospore

  2. Integument

  3. Endosperm

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

In the development of the proembryo, the zygote (oospore) divides to form a terminal cell and a basal cell. The basal cell gives rise to the suspensor, while the terminal cell gives rise to the embryo proper.

Multiple choice botany plant biology introduction to angiosperms phanerogams angiosperms

Which one induces agamospermy in Apple?

  1. Hormones

  2. Low temperature

  3. Cross pollination

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

Agamospermy (apomixis) in various plants, including apple, can be induced or promoted by the application of specific plant growth hormones.

Multiple choice botany plant biology introduction to angiosperms phanerogams angiosperms

In an angiosperm, a female plant having $2n=24$ is crossed with a male plant having $2n=12$. What will be the chromosome number of endosperm.

  1. $12$
  2. $18$
  3. $24$
  4. $30$
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Endosperm is formed by the fusion of one male gamete (n) and two polar nuclei (n+n). The female plant is 2n=24, so n=12. The male plant is 2n=12, so n=6. Endosperm = (n from male) + (n from female) + (n from female) = 6 + 12 + 12 = 30.