Consider the following statements : 1. Some species of turtles are herbivores. 2. Some species of fish are herbivores. 3. Some species of marine mammals are herbivores. 4. Some species of snakes are viviparous. Which of the statements given above are correct?
- A.1 and 3 only
- B.2, 3 and 4 only
- C.2 and 4 only
- D.1, 2, 3 and 4
Correct answer
Explanation
The correct answer is D, 1, 2, 3 and 4. Each statement is true: there are plant-eating turtles, fish and marine mammals, and some snakes give birth to live young.
The adult green sea turtle feeds mainly on seagrass and algae, which is what gives its body fat a greenish tint. Many fish are herbivores, such as parrotfish and surgeonfish that graze algae on coral reefs and the grass carp of fresh water. Among marine mammals, the dugong and the manatee, called sea cows, live almost entirely on seagrass and other water plants. Most snakes lay eggs, but boas, anacondas, many vipers and most sea snakes are viviparous or bear live young, which helps them survive in cold places or in water.
A is wrong: it leaves out the herbivorous fish and the viviparous snakes.
B is wrong: it leaves out the herbivorous turtles.
C is wrong: it leaves out the herbivorous turtles and marine mammals.
Exam tip: green sea turtle, parrotfish and dugong eat plants; sea snakes and anacondas bear live young.
Practice Questions
View allIf one set of chromosomes for a given plant is represented as N; in case of double fertilization, the zygote and the endosperm nucleus of a diploid plant would have how many sets of chromosomes respectively?
- A.N and 2N
- B.2N and 2N
- C.N and 3N
- D.2N and 3N
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The zygote is diploid (2N) and the primary endosperm nucleus is triploid (3N). Double fertilisation is a feature of flowering plants.
Read the full explanation →Which one of the following statements is NOT correct for the given reaction? Fe(s) + CuSO4(aq) → FeSO4(aq) + Cu(s)
- A.Iron is the reducing agent
- B.The solution turns green in colour after the reaction
- C.Copper is a more reactive metal than iron
- D.The reaction is an example of a redox reaction
Show answer
The reaction happens because iron is more reactive than copper and pushes it out of its salt, so statement C is false.
Read the full explanation →Which one of the following statements is correct ?
- A.Xylem consists of tracheids, vessels, xylem parenchyma and xylem fibres.
- B.Flexibility in plants is due sclerenchyma.
- C.Parenchyma have no intercellular spaces.
- D.Xylem consists of sieve plate, sieve tube and companion cells.
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These four elements make up the complex tissue that carries water and minerals upward from the roots. Tracheids and vessels are long, dead, thick-walled tubes through which water moves; xylem parenchyma is the only living part and stores food; xylem fibres give support.
Read the full explanation →When light is scattered by a molecule and the frequency of the scattered light is changed, this phenomenon is called
- A.Rayleigh scattering.
- B.Raman effect.
- C.Photoelectric effect.
- D.Rutherford scattering.
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In the Raman effect, a small part of the light scattered by molecules comes out with a changed frequency. C.V.
Read the full explanation →Which one of the following is not an example of a redox reaction?
- A.AlCl3 + 3H2O → Al(OH)3 + 3HCl
- B.2NaH → 2Na + H2
- C.4Fe + 3O2 → 2Fe2O3
- D.CuSO4 + Zn → Cu + ZnSO4
Show answer
This is a hydrolysis reaction in which no element changes its oxidation number, so nothing is oxidised or reduced. A redox reaction is one in which one substance loses electrons (its oxidation number rises) and another gains them (its oxidation number falls).
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