Tag: biology

Quizzes (1160) Questions (12174)

Questions Related to biology

Multiple choice plant kingdom biology

Which one of the following structures not found in any class of algae?

  1. Rhizoid and apical cell

  2. Apical cell

  3. Embryo

  4. Thalloid plant body
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Algae typically possess thalloid plant bodies and can have rhizoids or apical cells depending on the group, but true embryos are entirely absent in algae and only appear starting from bryophytes onwards.

Multiple choice plant kingdom biology

Choose the correct statement.

  1. Haploid contained of human DNA is4.6$\times{10}^6$bp

  2. A nitrogenous base is linked to pentose sugar through phosphodiester linkage

  3. X-ray diffraction data of Maurice Wilkins and Rosalind Franklin was the basis of Watson and Crick's DNA model

  4. DNA is an acidic substance was first identified by Watson and Crick
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Watson and Crick relied heavily on experimental data, including the X-ray diffraction images produced by Rosalind Franklin and Maurice Wilkins, to deduce the double helix structure of DNA. The other statements contain factual inaccuracies regarding base pairing links, genome size, or historical attribution.

Multiple choice plant kingdom biology

Smallest unit in the plant cell wall is

  1. Micelle

  2. Microfibril

  3. Fibril

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

In plant cell wall structure, the micelle is considered the smallest unit, consisting of a bundle of cellulose chains.

Multiple choice plant kingdom biology

Laminarin and mannitol, the reserve food of brown algae, are

  1. lipids

  2. complex carbohydrates

  3. proteins

  4. lipoproteins
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The food in the members of Phaeophyceae is stored as complex carbohydrates in the form of laminarin or mannitol.

Multiple choice plant kingdom biology

Consider the following statements.
a. Ectocaipus has an alternation of isomorphic generations
b. Fucus has no free living haploid generation
c. All red algae are multicellular organisms
d. Brown algae have a few unicellular species
Which of these statements are correct?

  1. $1, 2, 3$ and $4$
  2. $2, 3$ and $4$
  3. $1, 3$ and $4$
  4. $1$ and $2$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

All four statements are correct: Ectocarpus shows isomorphic alternation of generations, Fucus is diplontic (no free-living haploid generation), red algae are multicellular, and some brown algae (like some species of Ectocarpus) are unicellular.

Multiple choice biology food production uses of animals agro-complimentary occupations improvement of crop production

Which of the following process is helpful in hybrid seed production?

  1. Embryo rescue

  2. Apomixis

  3. Polyembryony

  4. Somatic hybridisation
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
  • Apomixis in flowering plants is defined as the asexual formation of a seed from the maternal tissues of the ovule, avoiding the processes of meiosis and fertilization, leading to embryo development. 
  • It plays an important role in hybrid seed production. The method of producing hybrid seeds by cultivation is very expensive for farmers. Also, by sowing hybrid seeds, it is difficult to maintain hybrid characters as characters segregate during meiosis.
  • Apomixis prevents the loss of specific characters in the hybrid. Also, it is a cost-effective method for producing seeds.
  • So, the correct answer is 'Apomixis'.
Multiple choice biology food production uses of animals agro-complimentary occupations improvement of crop production

The nitrogen deficiency of soil can be fulfilled by using the principle of

  1. Crop rotation

  2. Transplantation

  3. Multiple cropping

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

Crop rotation is a simple process of growing alternatively legume crops after every cycle of a commercial crop. The leguminous plant have root nodules in which nitrogen fixing bacteria resides which convert atmospheric nitrogen into usable forms by plants and hence increase the fertility of the soil.

Broadcasting is a method of throwing seeds randomly on the soil for germination. Transplantation is the process of uprooting in replanting the plants at some other place. Multiple cropping is growing two or more crops together in the same piece of land in the same season.These cannot help in curing the Nitrogen deficiency of the soil.
Thus, the correct answer is 'Crop rotation.'

Multiple choice biology food production uses of animals agro-complimentary occupations improvement of crop production

A group of animals related by descent and similar in most characters are said to be__________________

  1. Clone

  2. Variant

  3. Breed

  4. Variety
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

  • The organisms which are related by descent are known as breed. They have most of the characters which are similar. 
  • The general features, characteristics, size, appearance, etc. of these animals resemble each other. 
  • These animals mate or breed with each other in the same breed in order to maintain the pure line breed.
Thus, the correct answer is option C. 

Multiple choice biology food production uses of animals agro-complimentary occupations improvement of crop production

One way of incorporating desirable characters into crop varieties is by 

  1. Fertilization

  2. Leaching

  3. Hybridization

  4. Composting
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

One way of incorporating desirable characters into crop varieties is by hybridisation. Hybridisation refers to crossing between genetically dissimilar plants.

Thus, the correct answer is option C.