Tag: introduction to angiosperms

Questions Related to introduction to 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.

botany plant biology introduction to angiosperms phanerogams angiosperms

  1. $12$

  2. $18$

  3. $24$

  4. $30$

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Correct Option: D

In angiosperms, microsporogenesis and megasporogenesis.

botany plant biology introduction to angiosperms phanerogams angiosperms

  1. Occur in anthers

  2. Form gametes without further divisions

  3. Involve meiosis

  4. Occur in ovule

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Correct Option: C
Which of the following pairs in angiosperms are diploid and triploid respectively?
botany plant biology introduction to angiosperms phanerogams angiosperms

  1. Microspore mother cell and egg cell

  2. Secondary nucleus and endosperm

  3. Polar nucleus and secondary nucleus

  4. Endosperm and antipodal cells

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Correct Option: B

Vessels are absent in which one of the following families of angiosperms?

botany plant biology introduction to angiosperms phanerogams angiosperms

  1. Ranunculaceae

  2. Emteraceae

  3. Myrtaceae

  4. Casuarinaceae

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Correct Option: A

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

botany plant biology introduction to angiosperms phanerogams angiosperms

  1. Caytaniales

  2. Cycadeoidales

  3. Czekanowskiales

  4. Pentoxylales

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Correct Option: A

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.

botany plant biology introduction to angiosperms phanerogams angiosperms

  1. $1, 2$ and $3$ correct

  2. $1$ and $2$ are correct

  3. $2$ and $3$ are correct

  4. $1$ and $3$ are correct

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Correct Option: A

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.

botany plant biology introduction to angiosperms phanerogams angiosperms

  1. $1, 2$ and $3$

  2. $4$ only

  3. $1$ and $2$

  4. $1, 3$ and $4$

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Correct Option: A

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?

botany plant biology introduction to angiosperms phanerogams angiosperms

  1. $65$ and $500$

  2. $63$ and $252$

  3. $63$ and $500$

  4. $63$ and $504$

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Correct Option: C
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’. 

A seed is

botany plant biology introduction to angiosperms phanerogams angiosperms

  1. A female gametophyte

  2. A mature pollen tube

  3. A mature ovule

  4. A mature ovary

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Correct Option: C
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'

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

botany plant biology introduction to angiosperms phanerogams angiosperms

  1. 60

  2. 63

  3. 626

  4. 312

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Correct Option: B