Which one of the following options shows the correct evolutionary order of the plants mentioned below?
(i) Ferns (ii) Ginkgo (iii) Zosterophyllum (iv) Gnetales
Choose the correct option.
(i) Ferns (ii) Ginkgo (iii) Zosterophyllum (iv) Gnetales
Choose the correct option.
Show Hint
- (i), (iii), (ii), (iv)
- (iii), (i), (ii), (iv)
- (i), (ii), (iii), (iv)
- (iv), (ii), (i), (iii)
The Correct Option is B
Solution and Explanation
Step 2: Ferns (i) evolved later, around 360 million years ago during the Devonian period.
Step 3: Ginkgo (ii) appeared around 270 million years ago in the Permian period, and Gnetales (iv) are more recent, evolving around 150 million years ago in the Mesozoic era.
Thus, the correct evolutionary order is (iii) Zosterophyllum, (i) Ferns, (ii) Ginkgo, (iv) Gnetales.
Top Questions on evolution
- How does the process of Natural Selection affect Hardy-Weinberg equilibrium? Explain with the help of graphs.
- Assertion (A): The number of white winged moths decreased after industrialisation in England.
Reason (R): Effects of industrialisation were more marked in rural areas of England. - The first human-like hominid evolved during human evolution is supposed to be:
- The primates that probably lived in East Africa grasslands about two mya were:
Read the following passage and answer the questions that follow.
The most convincing evidence to trace evolutionary relationships between humans and different groups of animals come from the basic similarities seen at the molecular level. Study the table given below that depicts the number of amino acid differences between the haemoglobin polypeptide of a few animals with that of humans and answer the questions that follow.
S.No. Animal No. of amino acid differences in haemoglobin with that of humans 1. Macaque 08 2. Dog 32 3. Bird 45 4. Frog 67 5. Lamprey 125 (a) To which category of evolution (Divergent or Convergent) do the following evolutionary relationships belong to:
(i) Humans and Macaque
(ii) Humans and Frog
(b) What do the biochemical similarities in haemoglobin suggest about the evolutionary relationship between humans, frog, and lamprey?
(c) (i) Which one of the two – lampreys’ or macaques’ evolution is more closely related to humans and why?
OR
(c) (ii) Which one of the two – frogs’ or dogs’ evolution is more closely related to humans and why?
Questions Asked in CBSE CLASS XII exam
(a) Calculate the standard Gibbs energy (\(\Delta G^\circ\)) of the following reaction at 25°C:
\(\text{Au(s) + Ca\(^{2+}\)(1M) $\rightarrow$ Au\(^{3+}\)(1M) + Ca(s)} \)
\(\text{E\(^\circ_{\text{Au}^{3+}/\text{Au}} = +1.5 V, E\)\(^\circ_{\text{Ca}^{2+}/\text{Ca}} = -2.87 V\)}\)
\(\text{1 F} = 96500 C mol^{-1}\)- CBSE CLASS XII - 2025
- Electrochemistry
Define the following:
(i) Cell potential
(ii) Fuel Cell- CBSE CLASS XII - 2025
- Electrochemistry
Calculate the emf of the following cell at 25°C:
\[ \text{Zn(s)} | \text{Zn}^{2+}(0.1M) || \text{Cd}^{2+}(0.01M) | \text{Cd(s)} \] Given: \[ E^\circ_{\text{Cd}^{2+}/\text{Cd}} = -0.40 \, V, \, E^\circ_{\text{Zn}^{2+}/\text{Zn}} = -0.76 \, V \] \[ [\log 10 = 1] \]- CBSE CLASS XII - 2025
- Electrochemistry
Write chemical equations of the following reactions:
(i) Phenol is treated with conc. HNO\(_3\)
(ii) Propene is treated with B\(_2\)H\(_6\) followed by oxidation by H\(_2\)O\(_2\)/OH\(^-\)
(iii) Sodium t-butoxide is treated with CH\(_3\)Cl- CBSE CLASS XII - 2025
- Alcohols, Phenols And Ethers
Give a simple chemical test to distinguish between butan-1-ol and butan-2-ol.
- CBSE CLASS XII - 2025
- Alcohols, Phenols And Ethers