Tag: biology

Questions Related to biology

Wheel animalcules are

biology living world and classification of microbes pathogen and their mode of transmission economic importance of bacteria and fungi diseases and immunity five kingdoms of living organisms

  1. Coelenterates

  2. Echinoderms

  3. Rotifers

  4. Protozoans

Show answer
Correct Option: C
Explanation:
  • Animalcule is an older term for a microscopic animal or protozoan.
  • Rotifers are microscopic and free-living microscopic or near-microscopic pseudocoelomate animals belonging to the phylum Rotifera.
  • 90% of rotifers inhabit freshwater habitat but some live in brackish water and few in the ocean.
  • Rotifers are called wheel animalcules because their corona is composed of several ciliated tufts around the mouth that in motion resemble a wheel.
  • Hence wheel animalcules are Rotifers.
  • So, the correct answer is 'Rotifers'.

In most simple type of canal system of Porifera, which of the following ways exhibit water flow?

biology living world and classification of microbes pathogen and their mode of transmission economic importance of bacteria and fungi diseases and immunity five kingdoms of living organisms

  1. Ostia $\longrightarrow$ Spongocoel $\longrightarrow$ Osculum $\longrightarrow$ Exterior

  2. Spongocoel $\longrightarrow$ Ostia $\longrightarrow$ Osculum $\longrightarrow$ Exterior

  3. Osculum $\longrightarrow$ Spongocoel $\longrightarrow$ Ostia $\longrightarrow$ Exterior

  4. Osculum $\longrightarrow$ Ostia $\longrightarrow$ Spongocoel $\longrightarrow$ Exterior

Show answer
Correct Option: A
Explanation:
The central body cavity of sponges is called spongocoel. Their body is porous. The inhalent pores are called ostia and exhalent pores are known as oscula. The body of a sponge is organised in such a manner as to form a complex system of pores and canals. This system is called canal system. Water flows In through ostia to spongocoel and comes out to exterior via osculum. The continuous water current flowing through the canal system is very important for the life of a sponge. It brings in food and oxygen and canes away carbon dioxide, nitrogenous wastes and reproductive bodies. Thus, the canal system helps the sponge in nutrition, respiration, excretion and reproduction. So, the correct answer is 'Ostia $\longrightarrow$ Spongocoel $\longrightarrow$ Osculum $\longrightarrow$ Exterior'.

State whether the following statement is true or false:
Some organisms, like amoeba, can be classified as animals and plants.

biology living world and classification of microbes pathogen and their mode of transmission economic importance of bacteria and fungi diseases and immunity five kingdoms of living organisms

  1. True

  2. False

Show answer
Correct Option: B
Explanation:

Amoeba, unicellular protozoan, outerly covered by plasma membrane, cell wall is not present. So amoeba is purely animal cell.

So, the statement is false.

Choose the correct answers from the alternatives given.
Which of the following is the most accurate general description of the kingdom Protista?

biology living world and classification of microbes pathogen and their mode of transmission economic importance of bacteria and fungi diseases and immunity five kingdoms of living organisms

  1. Eukaryotic, photosynthetic or heterotrophic organisms that inhabit moist environments, form resistant cysts, and reproduce with flagellated gametes

  2. Relatively simple versions of plants, animals and fungi

  3. Eukaryotic, unicellular organisms that may be photosynthetic or heterotrophic

  4. Eukaryotic, heterotrophic and/or photosynthetic, unicellular or simple multicellular organisms, which are different enough from multicellular plants, fungi, or animals to be placed in this diverse group

Show answer
Correct Option: C
Explanation:

Kingdom Protista is a group in of eukaryotic organisms which have a true nucleus, they are usually unicellular and the cells of these organisms contain nucleus which is bound to the organelle,  algae are one of the classifications of protista which are photosynthetic organisms that are mostly found in freshwater sources or marine lakes. Protists are heterotrophic organism & on the other hand, has to acquire nutrition from other organisms such as plants or animals to survive.

So, the correct option is 'Eukaryotic, unicellular organisms that may be photosynthetic or heterotrophic'.

Wheat, paddy and other cereals which form, the staple food of mankind belong to the family

morphology of angiosperms introduction to angiosperms morphology of flowering plants plant kingdom biology

  1. Asteraceae

  2. Scitamineae

  3. Palmae

  4. Poaceae

Show answer
Correct Option: D
Explanation:
  • Poaceae or gramineae is the most economically important plant family.
  • It provides staple foods from domesticated cereal crops such as maize,wheat,rice,barley,millet etc.
  • So the correct answer is 'Poaceae'

Nodulated roots occur in

morphology of angiosperms introduction to angiosperms morphology of flowering plants plant kingdom biology

  1. Leguminosae

  2. Solanaceae

  3. Malvaceae

  4. Papilionaceae

Show answer
Correct Option: A
Explanation:

Nodulated roots occur in Leguminosae because these plants live in association with Rhizobium bacteria for obtaining nitrogen contents.

So, the correct option is 'Leguminosae'.

Family poaceae is member of series

morphology of angiosperms introduction to angiosperms morphology of flowering plants plant kingdom biology

  1. Nudiflorae

  2. Glumaceae

  3. Epigynae

  4. Microspermae

Show answer
Correct Option: B
Explanation:

  1. Nudiflora is a fungus of genus Cercospora.
  2. Glumaceae is a term used by Bentham and Hooker that include grasses.
  3. Epigyne is an order of plant which has an epigynous ovary.
  4. Microspermae is an order of flowering plant refers to the size of a seed.
So the correct option is 'Glumaceae'

Significance of vernlization is/are

morphology of angiosperms introduction to angiosperms morphology of flowering plants plant kingdom biology

  1. Early flowering

  2. Prevention of precocious reproductive development

  3. Shortening the life span of plants

  4. All of these

Show answer
Correct Option: A

Oryza sativa (rice) belongs to

morphology of angiosperms introduction to angiosperms morphology of flowering plants plant kingdom biology

  1. Solanaceae

  2. Malvaceae

  3. Liliaceae

  4. Poaceae

Show answer
Correct Option: D
Explanation:

Oryza sativa, commonly known as Asian rice belonging to the family Poaceae or Gramineae. Rice is the most widely grown tropical cereal, and over 400 million tonnes of milled rice is produced each year. Rice is a staple food of South Asia and a vast number of people are employed in its cultivation.

So, the correct answer is 'Poaceae'.

Lemma is

morphology of angiosperms introduction to angiosperms morphology of flowering plants plant kingdom biology

  1. Superior palea

  2. Inner palea

  3. Both A and B

  4. Inferior or outer palea

Show answer
Correct Option: D
Explanation:

The spikelet inflorescence is seen in family Poaceae. The spikelet consists of a short axis called rachilla on which 1 to many sessile or short-stalked flowers are borne. The florets may be arranged in the alternate or opposite manner on the central axis. At the base of rachilla two sterile scales, called glumes, are present. Above the glumes a series of florets are present. Each floret has an inferior palea or lemma and above it a superior palea is present. Hence, Lemma is the inferior or outer palea.

So, the correct answer is 'Inferior or outer palea'.