Tag: angiosperms

Quizzes (1) Questions (200)

Questions Related to angiosperms

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.

Multiple choice botany plant biology introduction to angiosperms phanerogams angiosperms

Starting with microspore mother cells, what is the least number of meiotic and mitotic divisions needed for the formation of $500$ male gametes in an angiosperm?

  1. $65$ and $500$
  2. $63$ and $252$
  3. $63$ and $500$
  4. $63$ and $504$
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

In angiosperms, one microspore mother cell undergo meiosis, form into four microspores or pollen grains. Each pollen grain by undergoing two mitotic divisions produces two male gametes. 63 microspore mother cells undergo 63 meiotic divisions and form into 252 microspores or pollen grains. These microspores undergo 500 mitotic divisions and form into 500 male gametes.

So, the correct option is ’63 and 500’. 

Multiple choice botany plant biology introduction to angiosperms phanerogams angiosperms

A seed is

  1. A female gametophyte

  2. A mature pollen tube

  3. A mature ovule

  4. A mature ovary
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

When the male nucleus fertilizes the egg cell, the entire ovule is converted into a structure which is known as a seed. The endosperm which is formed after double fertilization or triple fusion nourishes this growing seed.

So, the correct option is 'a mature ovule'

Multiple choice botany plant biology introduction to angiosperms phanerogams angiosperms

How many meiotic divisions are required to produce 250 pollen grains in an angiosperm?

  1. 60

  2. 63

  3. 626

  4. 312
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Each microspore mother cell (MMC) undergoes one meiosis to produce 4 pollen grains. To get 250 pollen grains, we need 250/4 = 62.5 MMCs. Since we cannot have half a division, we need 63 meiotic divisions (62*4 = 248, plus one more division to get the remaining 2).