Tag: biology

Questions Related to biology

Production of gametes in Bryophytes involve.

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

  1. Meiosis

  2. Mitosis

  3. fertilization

  4. Reduction division

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Correct Option: A

Which one of the following is not a common feature of gametophyte selfincompatibility systems?

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

  1. Pollen is $3$-celled

  2. Pistil is wet

  3. Rejection reaction occurs in the style

  4. In vitro germination of pollen is easy

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Correct Option: A

Aposporously formed gametophytes in Dryopetris will bear gametes that are ____________.

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

  1. Haploid

  2. Diploid

  3. Triploid

  4. Tetraploid

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Correct Option: A

Gametophyte self incompatibility does not differ from saprophytic self incompatibility in that.

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

  1. There is co dominance of self incompatibility alleles

  2. Both give $50\%$ functional. Pollen in pollinations on some other plants

  3. There is breakdown of incompatibility on induction of polyploidy

  4. There is complete failure of seed set on self pollination

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Correct Option: A

Read the given paragraph.
Where there is alternation of generations, the haploid multicellular plant is called a   (i)   and the diploid multicellular plant is called   (ii)   .    (iii)   generation is the dominant phase in algae showing haplontic type of life cycle. Bryophytes and pteridophytes usually possess    (iv)   types of life cycle.
Select the correct sequence of terms to complete the above paragraph.

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

  1. (i)-Sporophyte, (ii)-Gametophyte, (iii)-Gametophyte, (iv)-Diplontic

  2. (i)-Gametophyte, (ii)-Sporophyte, (iii)-Sporophyte, (iv)-Haplontic

  3. (i)-Sporophyte, (ii)-Gametophyte, (iii)-Sporophyte, (iv)-Haplodiplontic

  4. (i)-Gametophyte, (ii)-Sporophyte, (iii)-Gametophyte, (iv)-Haplodiplontic

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Correct Option: D

Read the given statements and select the correct option. 
Statement 1 : Bryophytes show alternation of generation.
Statement 2 : A haploid gametophytic generation and a diploid sporophytic generation alternate in the life cycle.

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

  1. Both statements 1 and 2 are correct.

  2. Statement 1 is correct but statement 2 is incorrect.

  3. Statement 1 is incorrect but statement 2 is correct.

  4. Both statements 1 and 2 are incorrect.

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Correct Option: A
Explanation:

Following are the correct statements: 

(i) Bryophytes show alternation of generation.
(ii) A haploid gametophytic generation and a diploid sporophytic generation alternate in the life cycle.
So, the correct answer is (a).

In moss,antheridia and archegonia occur at the tips of two different branches of the same plant.The condition is called

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

  1. Monoecious and autoecious

  2. Monoecious and paroicous

  3. Monoecious and synoicous

  4. Dioecious.

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Correct Option: B

Which of the following is a diploid?

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

  1. Capsule of moss

  2. Gametophyte. archegonia and egg of moss

  3. Gametophyte, antheridia and sperm of moss

  4. Gametophyte and spore of moss

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Correct Option: A
Explanation:

Mosses have neither pollen nor flowers and rely on water to carry the male gametes (the sperm) to the female gametes (the eggs). The spore capsules are produced after the sperms have fertilized the eggs. As they are produced after fertilisation, these spore capsules are diploid.

So, the correct option is 'Capsule of moss'.

Which one has the larges gametophyte?

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

  1. Cycas

  2. Angiosperm

  3. Selaginella

  4. Moss

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Correct Option: D
Explanation:

In bryophytes and pteridophytes and gymnosperms the male and female gametophytes to not have an independent free-living existence. They remain within the sporophyte. The gametophytes are quite large in Bryophytes as compared to other phyla like pteridophytes or angiosperms.

So, the correct option is 'Moss'

The centre of origin of wheat is

biology biotechnology and genetic engineering making use of enzymes genetic technology genetic engineering

  1. Southeast Asia

  2. Southwest Asia

  3. Asia minor and Afganistan

  4. None of the above

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Correct Option: B
Explanation:

Wheat is grown on more land area worldwide than any other crop and is a close third to rice and corn in total world production. Wheat is well adapted to harsh environments and is mostly grown on wind swept areas that are too dry and too cold for the more tropically inclined rice and corn, which do best at intermediate temperature levels. 

Wheat is believed to have originated in southwestern Asia. Some of the earliest remains of the crop have been found in Syria, Jordan and Turkey. Primitive relatives of present day wheat have been discovered in some of the oldest excavations of the world in eastern Iraq, which date back 9,000 years. Thus, the correct answer is option B.