Tag: biology

Questions Related to biology

In angiosperms the functional megaspore in the linear tetrad is generally.

microsporophyll vs megasporophyll plant kingdom biology

  1. Micropylar

  2. Second from micropylar

  3. Third from micropylar

  4. Fourth from micropylar

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Correct Option: D

Egg of female gametophyte is accompanied by.

microsporophyll vs megasporophyll plant kingdom biology

  1. Antipodal cell

  2. Synergids

  3. Definite nucleus

  4. Tube nucleus

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Correct Option: B

Fore-runner of male gamete is?

microsporophyll vs megasporophyll plant kingdom biology

  1. Megasporangium

  2. Antipodal cell

  3. Microspore mother cell

  4. Embryo sac

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Correct Option: C

A diploid male angiospermic plant is crossed with tetraploid female plant. Endosperm of seed will be.

microsporophyll vs megasporophyll plant kingdom biology

  1. Haploid

  2. Triploid

  3. Tetraploid

  4. Pentaploid

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Correct Option: B

What is not a post fertilization event?

microsporophyll vs megasporophyll plant kingdom biology

  1. Gametogenesis

  2. Embryogenesis

  3. Fruit formation

  4. Seed formation

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Correct Option: A

The filiform apparatus is present in ________.

microsporophyll vs megasporophyll plant kingdom biology

  1. Synergids

  2. Egg cell

  3. Antipodals

  4. Secondary nucleus

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Correct Option: A
Explanation:

The synergids have special cellular thickening at the micropylar tip called filiform apparatus, which plays an important role in guiding the pollen tube into the synergid.

Assertion : Most evolutionary trees place information about the pattern of relationship among organisms on the vertical axis and information about time on the horizontal axis.

Reason : An evolutionary tree depicts the pattern of relationships among parents and their offsprings.

microsporophyll vs megasporophyll plant kingdom biology

  1. If both the assertion and the reason are true and the reason is a correct explanation of the assertion

  2. If both the assertion and reason are true but the reason is not a correct explanation of the assertion

  3. If the assertion is true but the reason is false

  4. If both the assertion and reason are false

  5. If the assertion is false but reason is true

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Correct Option: D
Explanation:

An evolutionary tree depicts the pattern of relationships among major groups of organisms. Most evolutionary trees place information about the pattern of relationships among organisms on the horizontal axis and information about time on the vertical axis.

Hepatic portal system is found in

types of circulatory system circulatory pathways transportation in plants and circulation in animals body fluids and circulation biology

  1. All mammals

  2. All amniotes

  3. All vertebrates

  4. Higher invertebrates

  5. None of these

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Correct Option: A
Explanation:

A) The hepatic portal system is the venous system that returns blood from the digestive tract and spleen to the liver. It is present in mammals.

B) Not all amniotes have a hepatic portal system.
C) The hepatic portal system is found in amphibians and mammals.
D) Higher invertebrates do not have a hepatic portal system.
E) Mammals have a hepatic portal system.
So the correct answer is 'All mammals'.

Animals of which phylum contains open circulatory system?

types of circulatory system circulatory pathways transportation in plants and circulation in animals body fluids and circulation biology

  1. Arthropoda

  2. Annelida

  3. Hemichordata

  4. Both (a) and (c)

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Correct Option: D
Explanation:

Both Hemichordata and Arthropoda has an open circulatory system. In this system the heart pumps blood into an open cavity called a hemocoel.


How many of the examples mentioned posses closed (C) and open(O) circulatory system?

Cephalopod molluscs, non-cephalopod molluscs, Chordates, Annelids, Tunicates, Hemi-chordates and Arthropods
types of circulatory system circulatory pathways transportation in plants and circulation in animals body fluids and circulation biology

  1. C$=2$, O$=5$

  2. C$=4$, O$=3$

  3. C$=5$, O$=2$

  4. C$=3$, O$=4$

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Correct Option: A