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One of the most resistant known biological material is.
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One of the most resistant known biological material is.

A
lignin

B
hemicellulose

C
sporopollenin

D
lignocellulose

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Updated on: Nov 6, 2022

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Xtract Objective Biology for NEET (Disha)

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Sporopollenin is the tough resistant biopolymer that coats the outer walls of pollen grains spores and related micro-organisms. It is considered “the most resistant organic material known” and accounts for the morphology and microstructure and for geological preservation of polymorphs (an organic microfossils).
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Practice questions from Xtract Objective Biology for NEET (Disha)

Question 1
Easy
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Which of the following statement(s) is/are correct about self-incompatibility ?
(i) It is a device to prevent inbreeding.
(ii) It provides a biochemical block to self-fertilization.
(iii) It ensures cross-fertilization.
(iv) It is governed by pollen-pistil interaction.
(v) It is governed by series of multiple alleles.
(vi) It prevents self-pollen (from the same flower of other flowers of the same plant) from fertilizing the ovules by inhibiting pollen germination of pollen tube growth in the pistil.
  1. (i), (ii) and (iii)
  2. (i), (iv) and (v)
  3. All of the above
  4. None of the above
Topic

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Sexual Reproduction in Flowering Plants

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Book:

Xtract Objective Biology for NEET (Disha)

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Question 2
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The total number of nuclei involved in double fertilization in angiosperms are
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Topic

Topic:

Sexual Reproduction in Flowering Plants

Book

Book:

Xtract Objective Biology for NEET (Disha)

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Question 3
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Egg apparatus consists of
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Sexual Reproduction in Flowering Plants

Book

Book:

Xtract Objective Biology for NEET (Disha)

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Question 4
Easy
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The most common type of ovule is __________ .
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  2. hemitropous
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  4. campylotropous
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Topic:

Sexual Reproduction in Flowering Plants

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Book:

Xtract Objective Biology for NEET (Disha)

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Practice more questions from Sexual Reproduction in Flowering Plants

Question 1
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After fertilization, the outer integument forms
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Question 2
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Assertion (A): Tapetum is a part of anther wall that has 2-3 layers of cells.
Reason (R) : Tapetum layers helps in development and growth of pollen grain.
(A) Both assertion (A) and reason (R) are true and reason (R) is the correct explanation of assertion (A).
(B) Both assertion (A) and reason (R) are true but reason (R) is not the correct explanation of assertion (A).
(C) Assertion (A) is true but reason (R) is false.
(D) Assertion (A) is false but reason (R) is true.
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Sexual Reproduction in Flowering Plants

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Oswaal CBSE MCQs Chapterwise For Term I II, Class 12, Biology (Oswaal)

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Question 3
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Given functions of the following.
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Sexual Reproduction in Flowering Plants

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Question 4
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Study of pollen grains is called
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(B) Mycology
(C) Algology
(D) Polynology
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Sexual Reproduction in Flowering Plants

Book

Book:

Oswaal CBSE MCQs Chapterwise For Term I II, Class 12, Biology (Oswaal)

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Question Text
One of the most resistant known biological material is.
Updated OnNov 6, 2022
TopicSexual Reproduction in Flowering Plants
SubjectBiology
ClassClass 12
Answer TypeText solution:1 Video solution: 1
Upvotes215
Avg. Video Duration3 min