Gametogenesis Test

Gametogenesis

This is online test 02 for CBSE class 12 Biology Sexual Reproduction in Flowering Plants (Gametogenesis).. There are 10 questions in this test with each question having around four answer choices.

Questions & Answers

1
In some plants diploid embryo sac develop directly from diploid megaspore mother cell. This condition is called as
  • A
    Diplospory
    Correct
  • B
    Microspory
  • C
    Megaspory
  • D
    Monospory
2
Identify “A” and “B” in the T.S of mature anther
Question 2 figure 1
  • A
    Stomium and microspore mother cell
  • B
    Microspore mother cell and Tapetum
    Correct
  • C
    Epidermis and tapetum
  • D
    Middle layer and Tapetum
3
Within the embryo sac, three cells at chalazal end are called
  • A
    Central cells
  • B
    Synergids
  • C
    Antipodal cells
    Correct
  • D
    Egg apparatus
4
How many meiotic divisions are required to form 64 pollen grains
  • A
    16
    Correct
  • B
    32
  • C
    64
  • D
    80
5
Filiform apparatus present at micropylar part of the Synergids help in
  • A
    Help in absorption of water
  • B
    Help in germination of seed
  • C
    Guiding the entry of pollen tube
    Correct
  • D
    Providing nutrition to embryo
6
What happen to haploid megaspores formed by megaspore mother cell in an angiospermic plant
  • A
    Upper one produce embryo and lower 3 degenerate
  • B
    Upper 2 degenerate and lower two produce embryo sac
  • C
    Upper three degenerate and lower one produce embryo sac
    Correct
  • D
    All four produce 4 embryo sac
7
Which one is the correct evolutionary sequence of gametogenesis
  • A
    Sporogenous tissue, microspore, pollen grain, microspore mother cell
  • B
    Microspore mother cell, Sporogenous tissue, Pollen grain, microspore
  • C
    Sporogenous tissue, microspore mother cell, microspore, pollen grain
    Correct
  • D
    Pollen grain, microspore, microspore mother cell, Sporogenous tissue
8
Anther is a four sided structure consisting of four
  • A
    Pollen grains
  • B
    Mega sporangia
  • C
    Microsporangia
    Correct
  • D
    Theca
9
Assertion: The innermost layer of microsporangium is called tapetum. Reason: Tapetum performs the function of protection and help in dehiscence of anther to release pollen grains.
  • A
    Both assertion and reason are incorrect.
  • B
    Assertion is correct but reason is incorrect.
    Correct
  • C
    Both assertion and reason are correct.
  • D
    Assertion is correct but reason does not explain it.
10
Statement I: Megaspore mother cell undergoes meiotic division to form four megaspores. Statement II: One of the megaspore degenerate and three remain functional. Statement III: Only functional megaspore develops into female gametophyte.
  • A
    All statements are incorrect.
  • B
    All three statements are correct.
  • C
    Statement I and III are correct
    Correct
  • D
    Statement I and II are correct