Which one of the following is not characteristic feature of fungi ?
- A.Cell wall is made of chitin
- B.Filamentous mycelium is present
- C.Can carry out photosynthesis
- D.Asexual spores are produced
Correct answer
Explanation
The correct answer is C, Can carry out photosynthesis. Fungi have no chlorophyll, so they cannot make their own food by photosynthesis. They are heterotrophs that absorb food from outside: most are saprophytes living on dead organic matter, some are parasites such as rusts and smuts, and some live in partnership with algae as lichens or with plant roots as mycorrhiza. In the five-kingdom system of R.H. Whittaker they form a separate kingdom, Fungi, because of this mode of nutrition. Option A is wrong because the fungal cell wall is indeed made of chitin, the same substance found in the outer skeleton of insects, and not of cellulose. Option B is wrong because most fungi, such as bread mould, grow as a network of thread-like hyphae called mycelium; yeast is a single-celled exception. Option D is wrong because fungi commonly reproduce asexually by spores such as conidia, sporangiospores and zoospores. Exam tip: fungi = chitin wall, hyphae and mycelium, spores, no chlorophyll, food stored as glycogen.
Practice Questions
View allChlorophyll in photosynthetic prokaryotic bacteria is associated with
- A.plastids
- B.membranous vesicles
- C.nucleoids
- D.chromosomes
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Photosynthetic bacteria have no chloroplasts; their pigments sit on infoldings of the cell membrane that form vesicles or sacs, often called chromatophores.
Read the full explanation →Fat in human body is stored in
- A.Adipose tissue
- B.Red blood cells
- C.Muscle tissue
- D.Epithelial tissue
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Adipose tissue is a loose connective tissue whose cells, called adipocytes, are built to store fat. Each cell holds a large droplet of fat that pushes the nucleus and cytoplasm to one side.
Read the full explanation →Which one of the following is a metalloid ?
- A.Germanium
- B.Coke
- C.Iodine
- D.Sugar
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Germanium is a metalloid, an element whose properties lie between those of metals and non-metals. It is a hard, shiny, grey-white solid like a metal, yet it is brittle and conducts electricity far less well than a metal, which makes it a semiconductor.
Read the full explanation →A photon of X-ray has energy of 1 keV. A photon of visible radiation has energy of 3 eV. In this context, which one of the following statements is not correct?
- A.The wavelength of X-ray photon is less than the wavelength of visible radiation photon.
- B.Both the photons have different energies.
- C.The speeds of both the photons in vacuum are different.
- D.The frequency of X-ray photon is higher than the frequency of visible radiation photon.
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This statement is wrong because every photon, whatever its energy, travels in vacuum at the same speed of light, about 3 × 10^8 metres per second.
Read the full explanation →Which of the following substances cause temporary hardness in water?
1. Mg(HCO3)2
2. Ca(HCO3)2
3. CaCl2
4. MgSO4
Select the correct answer using the code given below.
- A.3 and 4
- B.2 and 3
- C.1 and 4
- D.1 and 2
Show answer
Temporary hardness is caused by the bicarbonates of magnesium and calcium, Mg(HCO3)2 and Ca(HCO3)2. It is called temporary because simple boiling removes it: on heating, the soluble bicarbonates break down into insoluble carbonate or hydroxide, carbon dioxide and water, and the solid settles out.
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