Cattle never feed on the leaves of Calotropis because of the presence of these chemicals
Show Hint
- Cardiac glycosides
- Lignin and chitin
- Nicotine
- Opium
The Correct Option is A
Solution and Explanation
Top Questions on Ecology and Environment
- Correctly depict (also indicate the trophic level) and describe the ecological pyramid of biomass in sea with 40 standing crop of phytoplankton supporting 90 standing crop of zooplankton which further supports 120 small fishes.
- CBSE CLASS XII - 2025
- Biology
- Ecology and Environment
Highly conserved proteins such as Haemoglobin and Cytochrome-C provide the best biochemical evidence to trace evolutionary relationships between different groups. Cytochrome-C is formed of 104 amino acids. Cytochrome-C is the respiratory pigment present in all eukaryotic cells. It has evolved at a constant rate during evolution. In chimpanzees and humans, Cytochrome-C genes are identical. The given data shows the evolution of the Cytochrome-C gene in different mammals from kangaroos, cows, rodents to humans:
Groups Nucleotide substitution in the gene of Cytochrome-C Millions of years ago Human/Kangaroo 100 125 mya Human/Cow 75 120 mya Human/Rodent 60 75 mya (a) Select the correct option for the time of separation of two groups and the number of nucleotide substitutions in the gene of Cytochrome-C:
Options Time of separation of two groups during evolution Number of nucleotide substitutions (i) Lesser Greater (ii) Greater Lesser (iii) Greater Greater (b) What do you infer about the type of evolution (convergent or divergent) for the given pair of groups and why?
(i) Human and Kangaroo
(ii) Human and Rodent
(c)
(i) Define convergent evolution.
OR
(ii) Define divergent evolution.- CBSE CLASS XII - 2025
- Biology
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- Explain how the loss of habitat and fragmentation drives plants and animals to extinction with the help of an example of habitat loss in the Tropical Rain Forest. Also write the effect of fragmentation of a habitat on the population decline.
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- (a) Write the full form of BOD.
(b) Define BOD. Explain how it is a measure of the organic matter present in the water body.- CBSE CLASS XII - 2025
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- Ecology and Environment
- Study the following and pick up the correct statements:
[I)] \Daphnia exhibits cyclomorphosis
[II)] In a thermally stratified lake of temperate region, the upper layer in winter is epilimnion
[III)] Niche is the functional role of an organism in an ecosystem
[IV)] Bergmann’s rule states the relationship between temperature and metabolic rate of animals- AP EAPCET - 2025
- Zoology
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The following data represents the frequency distribution of 20 observations:
Then its mean deviation about the mean is:- AP EAPCET - 2025
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What is the molarity of a solution prepared by dissolving 5.85 g of NaCl in 500 mL of water?
(Molar mass of NaCl = 58.5 g/mol)- AP EAPCET - 2025
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- What volume will 2 moles of an ideal gas occupy at STP (Standard Temperature and Pressure)?
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- A real valued function $ f: A \to B $ defined by $ f(x) = \frac{4 - x^2}{4 + x^2} \ \forall x \in A $ is a bijection. If $ -4 \in A $, then $ A \cap B = $
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