Tag: biology

Questions Related to biology

Choose the correct answers from the alternatives given.
Most of biological diversity has probably arisen by:

biology human influences on the environment human intervention in ecosystems humans in the environment involvement of humans in the conservation of environment

  1. anagenesis

  2. cladogenesis

  3. sympatric speciation

  4. phyletic evolution

Show answer
Correct Option: B
Explanation:

Anagenesis and cladogenesis are the two main ways speciation occurs. One involved the slow transition of one species to another. Cladogenesis involved the separation of a species into two or more groups, with each group then becoming its own separate species.

Phyletic gradualism is a model of evolution which theorizes that most speciation is slow, uniform and gradual. When evolution occurs in this mode, it is usually by the steady transformation of a whole species into a new one.
Sympatric speciation is a geographic mode of speciation due to geographical isolation new species is form.
So correct answer is B, cladogenesis.

High concentration of $SO _{2}$, $NO _{2}$, $CO _{2}$, SPM in atmosphere, causes threats to

biology human influences on the environment human intervention in ecosystems humans in the environment involvement of humans in the conservation of environment

  1. Human health

  2. Environment

  3. Plants

  4. Soil

Show answer
Correct Option: A

State whether the following statements are true or false.
Human intervention in natural community interactions usually makes the community more stable 

biology human influences on the environment human intervention in ecosystems humans in the environment involvement of humans in the conservation of environment

  1. True

  2. False

Show answer
Correct Option: B
Explanation:

Humans cause a lot of destruction to the natural world, through deforestation, starting forest fires, farming, and building things. So, when we destroy the environment making it unstable, we allow a new environment where secondary succession begins to take place. It is still slow, and habitats take hundreds of years to rebuild, and often are nothing like the habitat before it.

So, the given option is 'False'. 

Clinkers can be used as aggregate: concrete and

biology human influences on the environment human intervention in ecosystems humans in the environment involvement of humans in the conservation of environment

  1. Road Materials

  2. Furnitures

  3. Farms

  4. Food

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Correct Option: A

Which ecosystem is very important for man to produce food and fiber?

biology human influences on the environment human intervention in ecosystems humans in the environment involvement of humans in the conservation of environment

  1. Man subsidized solar power ecosystem

  2. Unsubsidized natural solar powered ecosystem

  3. Naturally subsidized solar powered ecosystem

  4. Fuel power ecosystem

Show answer
Correct Option: A

Global warming could cause a rise in the sea level because

biology human influences on the environment human intervention in ecosystems humans in the environment involvement of humans in the conservation of environment

  1. Oceans expand as they get warmer

  2. Glaciers and ice-sheets melt

  3. Both of the above

  4. None of these

Show answer
Correct Option: B
Explanation:

Melting of mass ice, glaciers around the world have caused increase in the sea level. The global warming is the main reason for the melting of ice, which are also a big reservoir of fresh water.

................... possess notochord, ............... do not possess notochord.

biology diversity in living things and their classification oviparous and viviparous number and shape of cells unicellular and multicellular organisms

  1. Vertebrates, invertebrates

  2. Invertebrates, vertebrates

  3. Notochords, chordates

  4. None of the above

Show answer
Correct Option: A
Explanation:

The animals who posses a proper notochord are known as vertebrates whereas the organisms who do not have a proper notochord are known as invertebrates.

.............. are those animals which have no backbone.

biology diversity in living things and their classification oviparous and viviparous number and shape of cells unicellular and multicellular organisms

  1. Invertebrates

  2. Vertebrates

  3. Mammals

  4. Aves

Show answer
Correct Option: A
Explanation:

The vertebral column is a supportive structure derived from the notochord. It is more commonly called the backbone or the spine. Animals that do not possess or develop a vertebral column or backbone are commonly called invertebrates. They include crabs, snails, lobsters, octopuses, sea urchins, worms, etc.

So, the correct answer is 'Invertebrates'.

Human beings are invertebrate.

biology diversity in living things and their classification oviparous and viviparous number and shape of cells unicellular and multicellular organisms

  1. True

  2. False

Show answer
Correct Option: B
Explanation:

Vertebrates are the animals that possess a dorsal hollow nerve cord, pharyngeal gill slits, and a notochord at some stage of their lives. Human beings are mammals that possess all three of these characteristics and are hence vertebrates.

So, the correct answer is 'False'.

Heart of both, vertebrates and invertebrates is present on dorsal side.

biology diversity in living things and their classification oviparous and viviparous number and shape of cells unicellular and multicellular organisms

  1. True

  2. False

Show answer
Correct Option: B
Explanation:

In nonchordates, heart is present on dorsal side of the body whereas in chordates heart is present on ventral side of the body.