Q1: Which one of the following is not a criterion for classification of fungi? (NEET 2024)
(a) Morphology of mycelium
(b) Mode of nutrition
(c) Mode of spore formation
(d) Fruiting body
Ans: (b)
The classification of fungi is based on various criteria that broadly include morphology, genetics, and physiological features. Each of the provided options, except one, is a valid criterion for the classification of fungi:
However, the option that is not a criterion for the classification of fungi is:
Mode of nutrition: While fungi are heterotrophic (meaning they obtain their food by absorbing dissolved molecules, typically from decomposing material), this characteristic is generally true across all fungi. They can be saprophytic (decomposers), parasitic (feeding on living organisms), or mutualistic (engaging in mutually beneficial relationships). Despite these differences in their ecological roles or interactions, the mode of nutrition is not typically used as a primary criterion for formal taxonomic classification in fungi. It is more pertinent to ecological or functional groupings rather than taxonomic classification.
Therefore, the correct answer is Option B: Mode of nutrition.
Q2: Match List I with List II (NEET 2024)
Choose the correct answer from the options given below:
(a) A-III, B-II, C-IV, D-I
(b) A-I, B-III, C-II, D-IV
(c) A-III, B-II, C-I, D-IV
(d) A-IV, B-III, C-II, D-I
Ans: (a)
Let's analyze the matching based on what each item in List I corresponds to in List II:
Given the matches:
A - Rhizopus corresponds to III, B - Ustilago corresponds to II, C - Puccinia corresponds to IV, D - Agaricus corresponds to I. Comparing these with the provided options:
Option A (A-III, B-II, C-IV, D-I) matches exactly with the analysis above.
Therefore, the correct answer is: Option A.
Q1: Given below are two statements: (NEET 2022 Phase 1)
Statement I: Mycoplasma can pass through less than 1 micron filter size.
Statement II : Mycoplasma are bacteria with cell wall.
In the light of the above statements, choose the most appropriate answer from the options given below:
(a) Statement I is correct but Statement II is incorrect
(b) Statement I is incorrect but Statement II is correct
(c) Both Statement I and Statement II are correct
(d) Both Statement I and Statement II are incorrect
Ans: (a)
Mycoplasma are the smallest cells and are only 0.3 μm in length. So it can pass through less than 1 μm filter size.
Mycoplasma lack cell wall.
(a) (b) (c)(d)
Q3: Mad cow disease in cattle and Cr Jacob disease in humans are due to infection by ______.
(a) Prion
(b) Bacterium
(c) Virus
(d) Viroid (NEET 2022 Phase 2)
Ans: (a)
Prions are abnormally folded proteins. They cause mad cow disease in cattle and Cr Jacob disease in humans.
Q1: Which of the following statements is correct? (NEET 2021)
(a) Organisms that depend on living plants are called saprophytes.
(b) Some of the organisms can fix atmospheric nitrogen in specialized cells called sheath cells.
(c) The fusion of two cells is called Karyogamy.
(d) Fusion of protoplasms between two motile on non-motile gametes is called plasmogamy.
Ans: (d)
Q1: Which of the following is correct about viroids? (NEET 2020)
(a) They have DNA with protein coat.
(b) They have free DNA without protein coat.
(c) They have RNA with protein coat.
(d) They have free RNA without protein coat.
Ans: (d)
Viroids have free RNA without protein coat. Viroid, an infectious particle smaller than any of the known viruses, an agent of certain plant diseases. The particle consists only of an extremely small circular RNA (ribonucleic acid) molecule, lacking the protein coat of a virus.
Q1: Which of the following statements is incorrect? (NEET 2019)
(a) Prions consist of abnormally folded proteins.
(b) Viroids lack a protein coat.
(c) Viruses are obligate parasites.
(d) Infective constituent in viruses is the protein coat.
Ans: (d)
Q2: Which of the following statements is incorrect? (NEET 2019)
(a) Yeasts have filamentous bodies with Iong thread-like hyphae.
(b) Morels and truffles are edible delicacies.
(c) Claviceps is a source of many alkaloid and LSD.
(d) Conidia are produced exogenously and ascospores endogenously.
Ans: (a)
Yeasts are not filamentous, they are usually oval in shape. They are not having hyphal structure.
Q1: Which among the following is not a prokaryote? (NEET 2018)
(a) Saccharomyces
(b) Mycobacterium
(c) Nostoc
(d) Oscillatoria
Ans: (a)
Q2: Select the wrong statement. (NEET 2018)
(a) Cell wall is present in members of fungi and plantae.
(b) Mushrooms belong to basidiomycetes.
(c) Pseudopodia are locomotory and feeding structures in sporozoans.
(d) Mitochondria are the powerhouse of the cell in all kingdoms except monera.
Ans: (c)
Q3: After karyogamy followed by meiosis, spores are produced exogenously in ______. (NEET 2018)
(a) Neurospora
(b) Alternaria
(c) Agaricus
(d) Saccharomyces
Ans: (c)
Karyogamy and meiosis takes place in the basidium producing four basidiospores. The basidiospores are exogenously produced on the basidium. The basidia are arranged in fruiting bodies called basidiocarps. Some common members are agaricus (mushroom).
Q4: Oxygen is not produced during photosynthesis by ______. (NEET 2018)
(a) Green sulphur bacteria
(b) Nostoc
(c) Cycas
(d) Chara
Ans: (a)
Green sulphur bacteria do not use H2O as source of proton, therefore they do not evolve O2.
Q5: Which of the following organisms are known as chief producers in the oceans? (NEET 2018)
(a) Dinoflagellates
(b) Diatoms
(c) Cyanobacteria
(d) Euglenoids
Ans: (b)
Diatoms are the most common form of phytoplankton in the ocean. They have the pigment chlorophyll which helps in photosynthesis. Since they are the primary producers of the aquatic chain and the marine ecosystem depends on them. They are called chief producers in the oceans.
Q6: Ciliates differ from all other protozoans in: (NEET 2018)
(a) Using flagella for locomotion.
(b) Having a contractile vacuole for removing excess water.
(c) Using pseudopodia for capturing prey.
(d) Having two types of nuclei.
Ans: (d)
Ciliates differs from other protozoans in having two types of nuclei. e.g., Paramoecium have two types of nuclei i.e. macronucleus & micronucleus.
Q1: DNA replication in bacteria occurs: (NEET 2017)
(a) Within nucleolus
(b) Prior to fission
(c) Just before transcription
(d) During the S phase
Ans: (b)
In bacteria DNA replication occurs in cytoplasm prior to fission. Prokaryotes due to their primitive nature do not show well marked S-phase.
Q2: Viroids differ from viruses in having: (NEET 2017)
(a) DNA molecules without protein coat
(b) RNA molecules with protein coat
(c) RNA molecules without protein coat
(d) DNA molecules with protein coat
Ans: (c)
Viroids are free RNA particles that lack protein coat. They are infectious agents smaller than viruses.
Q3: Which of the following components provides a sticky character to the bacterial cell? (NEET 2017)
(a) Nuclear membrane
(b) Plasma membrane
(c) Glycocalyx
(d) Cell wall
Ans: (c)
Glycocalyx is the outermost mucilage layer of the cell envelope which consists of non-cellulosic polysaccharides with or without proteins. It gives sticky character to the cell.
Q4: Which of the following are found in extreme saline conditions? (NEET 2017)
(a) Eubacteria
(b) Cyanobacteria
(c) Mycobacteria
(d) Archaebacteria
Ans: (d)
Halophiles, a type of archaebacteria, usually occur in extreme saline conditions like salt pans, salt beds and salt marshes
Q5: Which among the following are the smallest living cells, known without a definite cell wall, pathogenic to plants as well as animals and can survive without oxygen? (NEET 2017)
(a) Pseudomonas
(b) Mycoplasma
(c) Nostoc
(d) Bacillus
Ans: (b)
Mycoplasmas are smallest, prokaryotes lacking cell wall and are pleomorphic in nature. These are pathogenic to both plants and animals.
Q2: Methanogens belong to ______. (NEET 2016 Phase 2)
(a) Eubacteria
(b) Archaebacteria
(c) Dinoflagellates
(d) Slime moulds
Ans: (b)
Q3: Select the wrong statement. (NEET 2016 Phase 2)
(a) The walls of diatoms are easily destructible.
(b) ‘Diatomaceous earth’ is formed by the cell walls of diatoms.
(c) Diatoms are chief producers in the oceans.
(d) Diatoms are microscopic and float passively in water.
Ans: (a)
Diatoms are marine or freshwater unicellular organisms which have cell walls (frustules) composed of pectin impregnated with silica and consisting of two halves, one overlapping the other. The siliceous frustules of diatoms do not decay easily.
Q4: One of the major components of the cell wall of most fungi is: (NEET 2016 Phase 1)
(a) Cellulose
(b) Hemicellulose
(c) Chitin
(d) Peptidoglycan
Ans: (c)
Fungal cell wall contains chitin or fungal cellulose along with other polysaccharides, proteins, lipids and a number of other substances
Q5: Which of the following statements is wrong for viroids? (NEET 2016 Phase 1)
(a) They cause infections.
(b) Their RNA is of high molecular weight.
(c) They lack a protein coat.
(d) They are smaller than viruses.
Ans: (b)
Q6: Which one of the following statements is wrong? (NEET 2016 Phase 1)
(a) Eubacteria are also called false bacteria.
(b) Phycomycetes are also called algal fungi.
(c) Cyanobacteria are also called blue-green algae.
(d) Golden algae are also called desmids.
Ans: (a)
Eubacteria are also called true bacteria
Q7: The primitive prokaryotes responsible for the production of biogas from the dung of ruminant animals include the ______. (NEET 2016 Phase 1)
(a) Methanogens
(b) Eubacteria
(c) Halophiles
(d) Thermoacidophiles
Ans: (a)
Methanogens are microorganisms that produce methane as a metabolic byproduct in anoxic conditions. They are obligate anaerobic ancient and primitive bacteria. They are involved in methanogenesis
Q8: Chrysophytes, Euglenoids, Dinoflagellates and Slime moulds are included in the Kingdom ______. (NEET 2016 Phase 1)
(a) Fungi
(b) Animalia
(c) Monera
(d) Protista
Ans: (d)
All unicellular eukaryotic organism like diatoms, desmids (chrysophytes), euglenoids, dinoflagellates and slime mould are included in Protista
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1. What are the different levels of biological classification? |
2. What is the importance of biological classification? |
3. How do scientists classify organisms into different kingdoms? |
4. What is the difference between prokaryotic and eukaryotic organisms? |
5. Why is it important to use scientific names in biological classification? |
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