Tag: improvement in food resources

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Questions Related to improvement in food resources

Multiple choice biology improvement in food resources crop variety improvement improvement if crop varieties improvement in crop variety

.......... is a sterile hybrid which spreads by rhizome division

  1. Iris albicans

  2. Evening primrose

  3. Tangelo

  4. None of the above
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Hybrid plants can be developed by the breeding of the plants of different species. The parents are genetically different plants. Iris albicans is the sterile hybrid which is developed by breeding of two different species. This is known as interspecific hybridization. This is a sterile plant which spreads by rhizome division.

Thus, the correct answer is option A. 

Multiple choice biology improvement in food resources crop variety improvement improvement if crop varieties improvement in crop variety

Which of the following is not applicable to biological species concept?

  1. Hybridisation

  2. Reproductive isolation

  3. Natural selection

  4. Gene pool
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Answer is option A i.e. "Hybridisation"
The biological species concept defines a species as members of populations that interbreed in nature. According to this concept, organisms belong to the same species if they can interbreed to produce viable, fertile offspring. Reproductive isolation, natural selection and gene pool are applicable to one species.
Hybridisation, on contrary, occurs due to process of combining two different species of organisms to create a hybrid.
Hence, "hybridisation" is not applicable to biological species concept.

Multiple choice biology improvement in food resources crop variety improvement improvement if crop varieties improvement in crop variety

Total number of meiotic division required for forming $100$ zygotes/ $100$ grains of wheat is?

  1. $100$
  2. $75$
  3. $125$
  4. $50$
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

In angiosperms, one meiotic division produces 4 microspores, but only one functional megaspore is formed from one megaspore mother cell. For 100 grains, 100 meiotic divisions are needed for the male side (pollen) and 100 for the female side (ovule), totaling 200. However, if the question implies the standard formula (n + n/4), it is 125.

Multiple choice biology improvement in food resources crop variety improvement improvement if crop varieties improvement in crop variety

Assertion : Paraguay tea is obtained from Paullinia cupana

Reason :Tea is obtained from Camellia sinensis

  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
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

Paraguay tea is obtained from leaves of evergreen tree Ilex paraguariensis. 

All the leaves are used. Tea is obtained from the leaves of Camellia sinensis of family Theaceae. 
So, the correct answer is 'If the assertion is false but reason is true'

Multiple choice biology improvement in food resources crop variety improvement improvement if crop varieties improvement in crop variety

The evolution of cultivated cotton is an example of _______________.

  1. Distant hybridization and polyploidy
  2. Diploidization of sterile $F _1$

  3. lntergeneric hybridization and polyploidy

  4. Interspecific hybridization and polyploidy
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Cultivated cotton (Gossypium hirsutum) evolved through the hybridization of two different species followed by polyploidy (allotetraploidy).

Multiple choice biology improvement in food resources crop variety improvement improvement if crop varieties improvement in crop variety

In crop improvement programmes, haploids are of  great importance because they ___________________.

  1. Grow better even under adverse climatic conditions

  2. Are useful in studies of meiosis.

  3. Have less requirement for energy inputs

  4. Give homozygous lines following diploidization
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Haploids are useful in plant breeding because they can be doubled (diploidized) to produce completely homozygous lines in a single generation.