Tag: botany

Quizzes (264) Questions (5276)

Questions Related to botany

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.

Multiple choice botany plant biology introduction to angiosperms phanerogams angiosperms

In angiosperms, microsporogenesis and megasporogenesis.

  1. Occur in anthers

  2. Form gametes without further divisions

  3. Involve meiosis

  4. Occur in ovule
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Both microsporogenesis (in anthers) and megasporogenesis (in ovules) involve meiotic divisions to reduce the chromosome number from diploid to haploid.

Multiple choice botany plant biology introduction to angiosperms phanerogams angiosperms
Which of the following pairs in angiosperms are diploid and triploid respectively?

  1. Microspore mother cell and egg cell

  2. Secondary nucleus and endosperm

  3. Polar nucleus and secondary nucleus

  4. Endosperm and antipodal cells
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The secondary nucleus (formed by fusion of two polar nuclei) is diploid (2n), and the endosperm (formed by fusion of a male gamete and secondary nucleus) is triploid (3n).

Multiple choice botany plant biology introduction to angiosperms phanerogams angiosperms

Which fossil group formed the basis of Anthostrobilus theory of origin of angiosperms?

  1. Caytaniales

  2. Cycadeoidales

  3. Czekanowskiales

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

The Anthostrobilus theory, proposed by Arber and Parkin, suggests that angiosperms evolved from an extinct group of gymnosperms called Caytoniales (often spelled Caytoniales).

Multiple choice botany plant biology introduction to angiosperms phanerogams angiosperms

Consider the following statements associated with the germination of an angiosperm us seed.
a. As the seed gets hydrated and germinates. Enzymatic activity is increased.
b. The respiration rate of the germinating seed increases along with the increased enzymatic activity.
c. The increase in the respiratory rate continues till senescence.
Of the statements.

  1. $1, 2$ and $3$ correct
  2. $1$ and $2$ are correct
  3. $2$ and $3$ are correct
  4. $1$ and $3$ are correct
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

All three statements are correct: hydration triggers enzymatic activity, which increases respiration, and this high metabolic rate persists until the seedling is established (senescence of the seed stage).

Multiple choice botany plant biology introduction to angiosperms phanerogams angiosperms

Consider the following floral characteristics.
a. Spirally arranged floral parts on the torus
b. Inferior ovary
c. Actinomorphic corolla
d. Stamens many
According to Hutchinson's concept, primitive angiosperm us flowers are characterized by.

  1. $1, 2$ and $3$
  2. $4$ only
  3. $1$ and $2$
  4. $1, 3$ and $4$
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

According to Hutchinson's classification system for angiosperms, primitive flowers are characterized by a spiral arrangement of floral parts on an elongated receptacle or torus (acyclic or hemicyclic arrangement), numerous stamens, and an apocarpous superior ovary with actinomorphic corolla. Thus, characteristics 1, 3, and 4 define primitive flowers.