Tag: biology

Questions Related to biology

Approximately how many cells are present in the boy of an adult person?

biology evolution and biodiversity species, communities and ecosystems kingdom fungi monera, protista, fungi

  1. $10^{14}$

  2. $10^{15}$

  3. $10^{18}$

  4. $10^{21}$

Show answer
Correct Option: A
Explanation:

An adult human being has approximately 100 000 billion cells, all originating from a single cell, the fertilized egg cell.

So the correct answer is option A

Cotyledon is also known as

biology biological diversity species, communities and ecosystems kingdom fungi monera, protista, fungi

  1. Seed leaves

  2. Endosperm

  3. Embryo

  4. None of the above

Show answer
Correct Option: A
Explanation:
The cotyledons are referred to as seed leaves. It is because they act as the leaves of the seed during the process of germination. This in the sense that, as the leaves of plants provide food for the plants, so does the cotyledons provide food for the germinating plant. This is possible because the cotyledons store food necessary used during this process. So, the correct option is 'Seed leaves'.

Which character of pteridophytes is not similar to bryophytes?

biology biological diversity species, communities and ecosystems kingdom fungi monera, protista, fungi

  1. Water requirement for fertilization

  2. Dependence of sporophyte on gametophyte

  3. Heterospory

  4. None of these

Show answer
Correct Option: A
Explanation:

  • Bryophytes are known as the amphibians of plant kingdom because they need water for fertilisation. The sperms of bryophytes are flagellated and reach the eggs by means of swimming in water. On the other hand, pteridophytes do not need water for fertilisation.
  • Bryophytes have gametophyte as dominant phase of life on which sporophyte is dependent whereas Pteridophytes have sporophyte as dominant phase but sporophyte is not dependent on gametophyte.
  • Heterospory is the formation of two types of spores which are different in size i.e. large spores and small spores. Large spores are called megaspores while small spores are called microspores. Spores are formed by the sporophyte both in bryophytes and pteridophytes.
Hence, option A is defines a character which is not same in bryophytes and pteridophytes.
So, the correct answer is 'Water requirement for fertilization'.

Which of the following is an edible fungus? 

biology biosystematics species, communities and ecosystems kingdom fungi monera, protista, fungi

  1. Mushroom

  2. Cabbage

  3. Pea

  4. Rhizobium

Show answer
Correct Option: A
Explanation:
Edible mushrooms are fleshy and have edible fruit bodies. They are found either below ground or above ground where they may be picked by hand. Edibility is due to the absence of poisonous effects on humans and desirable taste and aroma.

So, the correct answer is 'So, the correct answer is 'Mushroom'

A taxonomic group of closely related genera is known as?

biology ecology species, communities and ecosystems kingdom fungi monera, protista, fungi

  1. Species

  2. Order

  3. Family

  4. Class

Show answer
Correct Option: A
Explanation:
Species represents a distinct group of the population that really or most likely breed from close animals. This taxonomic class is segregated from other classes through the method of reproduction. It bears minimal taxonomic traits.
It includes individuals that inherit basic similarities.It can be differentiated from other closely connected species because of idiosyncratic morphological characteristics. Option A is the answer

Midrib is present in leaves of

biology biological diversity species, communities and ecosystems kingdom fungi monera, protista, fungi

  1. Monocots

  2. Bryophytes

  3. Pteridophytes

  4. None of these

Show answer
Correct Option: D
Explanation:
option (d) is correct.
Explanation- It is in this layer that photosynthesis occurs. it contains a prominent midrib at the centre of the leaf blade which is the main vein. From this midrib arise branches called veins. they are of different types depending upon the type of edges, the pattern of the veins and the number of blades per leaf.

Which one of the following bacteria is used for production of transgenic plants?

transgenic organisms biotechnology and its applications biotechnology and its application biology

  1. Escherichia coli

  2. Bacillus subtilis

  3. Staphylococcus aureus

  4. Agrobacterium tumefaciens

Show answer
Correct Option: D
Explanation:

Agrobacterium tumefacians is used for the production of transgenic plants as it carries a plasmid capable of inducing tumors in plants. These tumors can be artificially induced by transferring the gene into a plant which otherwise is not prone to infection, where the plasmid is genetically engineered for inserting a particular gene, for example, the transfer of delta endotoxin and npt II gene, from Bacillus thuringiensis, in commercially useful plants like cotton to protect it from its predator, the gall worm

So, the correct answer is 'Agrobacterium tumefaciens'

The process of reduction of pollution by use of organisms is called as

transgenic organisms biotechnology and its applications biotechnology and its application biology

  1. Biotechnology

  2. Bioremediation

  3. Bioneutralizer

  4. Biopurifier

Show answer
Correct Option: B
Explanation:

Bio-remediation is a waste management technique that involves the use of organisms to remove or neutralize pollutants from a contaminated site. Bio-remediation is a treatment that uses naturally occurring organisms to break down hazardous substances into less toxic or non toxic substances. 

Transgenic plants are developed by

transgenic organisms biotechnology and its applications biotechnology and its application biology

  1. Introducing foreign gene

  2. Introducing gene mutations

  3. Deleting certain chromosome

  4. Inhibiting spindle formation

Show answer
Correct Option: A

The genetically modified crops are known as 

transgenic organisms biotechnology and its applications biotechnology and its application biology

  1. Transgenic species

  2. Transgenic plants

  3. Transgenic wildlife

  4. None of the above

Show answer
Correct Option: B
Explanation:

A transgenic crop plant contains a gene or genes which have been artificially inserted instead of the plant acquiring them through pollination. The inserted gene sequence (known as the transgene) may come from another unrelated plant, or from a completely different species: transgenic Bt corn, for example, which produces its own insecticide, contains a gene from a bacterium.