Tag: biology

Questions Related to biology

The gametophyte of  Bryophytes reproduction sexually by Isogamy Physiological anisogamy

biology plant kingdom alternation of generation in angiosperms alternation of generation angiosperms

  1. Isogamy

  2. Physiological anisogamy

  3. Siphanogamous oogamy

  4. Zooidogamous oogamy

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Correct Option: A

Arange the following division in the correct sequence of the progressive evolution in their haploid phase (Gametophyte)
I) Thallophyta
II) Bryophyta
III) Pteridophyta 
IV) Spermatophta

biology plant kingdom alternation of generation in angiosperms alternation of generation angiosperms

  1. $IV,III,I,II$

  2. $IV,III,II,I$

  3. $IV,II,III,I$

  4. $II,I,III,IV$

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Correct Option: A

The gametophyte is always dioecious in 

biology plant kingdom alternation of generation in angiosperms alternation of generation angiosperms

  1. All pteridophytes

  2. Gymnosperms only

  3. Angiosperms

  4. All spermatophytes

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Correct Option: A

Zygote does not undergo immediate reduction division in all, except :

biology plant kingdom alternation of generation in angiosperms alternation of generation angiosperms

  1. Gymnosperms

  2. Pteridophytes

  3. Bryophytes

  4. Angiosperms

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Correct Option: C
Explanation:

Answer is option C i.e. "Bryophytes"
The zygote does not undergo meiosis immediately in bryophytes to form the sporophyte (a multi-cellular body). Some cells of the sporophyte undergo meiosis to form haploid spores. Spores further germinate to produce the gametophyte.

Choose the correct statement:

biology plant kingdom alternation of generation in angiosperms alternation of generation angiosperms

  1. bryophytes can live in soil but are dependent on water for sexual reproduction

  2. sex organ in bryophytes are unicellular

  3. Main plant body in bryophytes are gametophytes , differentiated into true root , stem and leaves

  4. Common examples of liverworts is Polytrichum

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Correct Option: A

The term prothallus is used for

biology plant kingdom alternation of generation in angiosperms alternation of generation angiosperms

  1. Stage before thallus

  2. Plant body without differentiation of stem.leaves and roots

  3. Reduced gametophyte

  4. Reduced sporophyte

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Correct Option: C

Opening of floral buds into flowers, is a type of:

biology plant kingdom alternation of generation in angiosperms alternation of generation angiosperms

  1. Autonomic movement of growth

  2. Autonomic movement of locomotion

  3. Autonomic movement of variation

  4. Paratonic movement of growth

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Correct Option: A

Consider the following four statements whether they are correct or wrong
(A)The sporophyte in liverworts is more elaborate than that in mosses
(B)Salvinia is heterosporous
(C)The Life-cycle in all seed-bearing plants is diplontic
(D) In Pinus male and female cones are borne on different trees
 The two wrong statements together are

biology plant kingdom alternation of generation in angiosperms alternation of generation angiosperms

  1. Statements (A) and (C)

  2. Statements(A) and (D)

  3. Statements(B) and (C)

  4. Statements (A) and (B)

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Correct Option: B

What are chromosome number in the following respectively (i) Synergid of Gossypium (ii) Leaf cells in Allium (iii) Endosperm of Saccharum.

biology plant kingdom alternation of generation in angiosperms alternation of generation angiosperms

  1. $48, 16, 36$

  2. $52, 26, 32$

  3. $26, 16, 120$

  4. $48, 96, 24$

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Correct Option: C

Haploids are considered better genetic stock because they ______________.

biology plant kingdom alternation of generation in angiosperms alternation of generation angiosperms

  1. Require only half of the nutrients

  2. Are best for cytological studies

  3. Grow better under all conditions

  4. Form homozygous individuals on depolarization

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Correct Option: A