Tag: biology

Quizzes (1160) Questions (12174)

Questions Related to biology

Multiple choice biology cell-the basic unit of life number and shape of cells unicellular and multicellular organisms cell parameters diversity and classification in animals

The largest cell measuring .........., is the egg of an ostrich.

  1. 130 mm-150 mm

  2. 130 mm-180 mm

  3. 130 mm-170 mm

  4. 170 mm-190 mm
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The cell is the structural unit of life and its size ranges from 0.5 micrometers to 100 micrometers. An egg of ostrich is a single-celled structure and know as the largest cell in the world with the size of 130 mm-170 mm. Thus, the correct answer is option C.

Multiple choice biology seed dispersal food material and source sources of food and food habits of animals forests: our lifeline

Scattering of seeds over a wide area is called ...........

  1. Pollination

  2. Fertilisation

  3. Dispersal

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

  1. Transfer of pollen grains from the anther to the stigma of either same of a different flower of the same or different plant is pollination.
  2. The fusion of male and female gametes is known as fertilization.
  3. Scattering of seeds over a wide area by animals or other means is called dispersal.
  4. Growing of a new plant from seed under the favorable condition is known as germination.
So the correct option is "Dispersal".

Multiple choice biology interdependence of organism and the environment food material and source sources of food and food habits of animals forests: our lifeline

A detrivorous animal of economic importance is

  1. Caterpillar larva

  2. Leech

  3. Earthworm

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

Detrivores are those animals which obtain their nourishment by consuming decomposing plant and animal parts. Earthworms decompose the organic matter of soil thus aerating it which is then used by farmers as fertilizers. Thus it improves the fertility of soil making it more porous. 

Caterpillar larva feeds on leaves.
Leech is sanguivores which means blood sucking organism.
Giriraja fowl feeds on small insects and grass.
Thus, the correct answer is option C. 

Multiple choice biology interdependence of organism and the environment food material and source sources of food and food habits of animals forests: our lifeline

Bacteria and fungi in a forest ecosystem are generally 

  1. Producers

  2. Decomposers

  3. Primary consumers

  4. Secondary consumers

  5. Tertiary consumers
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Decomposers are saprotrophs which decompose the organic remains by secreting extracellular digestive enzymes. Due to degradation of organic remains, decomposers are also called reducers. They are also known as mineralisers as they release minerals trapped in organic remains. Bacteria and fungi, in general microorganisms, are usually detrivores that feed on dead and decaying organic matter and act as decomposers.

Multiple choice biology interdependence of organism and the environment food material and source sources of food and food habits of animals forests: our lifeline

The bacteria that attack dead organic matter are

  1. Producers

  2. Herbivores

  3. Carnivores

  4. Decomposers
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Decomposers are organisms feeding on dead remains of plants and animals and excreta of animals. Decomposers are saprotrophs, which decompose the organic remains by secreting extracellular digestive enzymes. Due to degradation of organic remains, decomposers are also called as reducers. They are also known as mineralizers, as they release minerals trapped in organic remains.

Multiple choice biology interdependence of organism and the environment food material and source sources of food and food habits of animals forests: our lifeline

Microorganisms are

  1. Primary consumers

  2. Secondary consumers

  3. Tertiary consumers

  4. Decomposers
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
  • The food chain starts with energy from the sun, which is captured by plants and converted into fuel through photosynthesis. 
  • Primary consumers eat plants, and secondary and tertiary consumers feed on primary consumers. At the end of the chain, a group of micro-organisms called as decomposers carry out natural process of decomposition and form the final link in the food chain. They break down dead animals and plants and return vital nutrients to the soil.
  • So, option D is correct here.
Multiple choice biology interdependence of organism and the environment food material and source sources of food and food habits of animals forests: our lifeline

Decomposers are

  1. Autotrophs

  2. Heterotrophs

  3. Autoheterotrophs

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

Decomposers are heterotrophs feeding on the dead and decaying matter. More specifically decomposers are saprotrophs, which decompose the organic remains by secreting extracellular digestive enzymes. Due to degradation of organic remains, decomposers are also called as reducers. They are also known as mineralizers, as they release mineral trapped in organic remains.