Download App

Heredity and Evolution — Science STD 10 — Question

CBSE BoardEnglish MediumSTD 10ScienceHeredity and Evolution5 Marks
Question
Bacteria have a simpler body plan when compared with human beings. Does it mean that human beings are more evolved than bacteria? Provide a suitable explanation.
✓

Answer

It depends on our perspective through which we try to evaluate evolution. If complexity in body design is the parameter to define evolution, then human beings are more evolved than bacteria. Bacteria are unicellular while human beings are multicellular. Bacteria show cellular level of organization, while human beings show organ system level of organization. In terms of complexity human beings are definitely highly evolved compared to bacteria.But when we compare the ability of survival, then situation is quite opposite. Human beings are living in almost every part of the earth but they can live only on land. Moreover, in extreme environmental conditions, human beings make artificial facilities to counter the adverse conditions. This means their body is not adapted to withstand extreme climatic conditions. Bacteria, on the other hand, are known to be present almost everywhere on earth. They are known to live even in some of the harshest conditions; like Sulphur spring, crater of volcano, etc. Bacteria can survive in highly acidic environment and they can survive extreme temperatures. From this angle, bacteria can be considered as more evolved than human beings.

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Explore more

More "[5 marks Questions]" from Heredity and Evolution→Heredity and Evolution — all question types→Science STD 10 question papers→CBSE Board STD 10 question papers→CBSE Board question paper generator→

Similar questions

Explain the following terms related to spherical lenses:
  1. Centres of curvature.
  2. Principal axis.
  3. Optical centre.
  4. Principal focus.
At what distance from a concave lens of focal length 20 cm, should a 6 cm tall object be placed so that it forms an image at 15 cm from the lens? Also determine the size of the image formed.
→
What is meant by:
  1. Displacement reaction, and
  2. Double displacement reaction? Explain with the help of one example each.
→
When we touch a hot plate unknowingly, then this heat is sensed by a receptor P present in our fingers. The receptor triggers and impulse in neuron Q which transmits the message to an organ R which is a part of the central nervous system. Here the impulse is passed on to a neuron S which in turn passes it to a yet another neuron T. The neuron T passes the impulse to a tissue U in our arm. The tissue U then contracts and pulls our hand away from the hot plate.
  1. What is the name of (i) receptor P (ii) neuron Q, and (iii) organ R?
  2. What is (i) neuron S, and (ii) neuron T?
  3. Name the tissue U.
  4. What name is given to the phenomenon in which hand is pulled away quickly from the hot plate?
  5. Name the effector in this whole process.
→
$(i) '\ A\ '\  '\ B\ '$ are sodium salts of long$-$chain carboxylic acid and long chain Sulphonic acid respectively. Which one of $A$ or $B$ will you prefer as a cleansing agent while using underground water $($hand pump water$)$?
Give the reason for your answer.
$(ii)$ Elaborate on the process of cleansing action. Illustrate micelle with the help of labelled diagram.
$(iii)$ Write the chemical equation of the preparation of soap from an ester
$CH_3COOCH_3$. What is the name of this process?
→
State and explain the reaction, if any, of the following metals with a solution of copper sulphate:
  1. Gold.
  2. Copper.
  3. Zinc.
  4. Mercury.
→
  1. Define optical centre of a spherical lens.
  2. A divergent lens has a focal length of 20cm. At what distance should an object of height 4cm from the optical centre of the lens be placed so that its image is formed 10cm away from the lens. Find the size of the image also.
  3. Draw a ray diagram to show the formation of image in above situation.
→
An object is placed 10cm from a lens of focal length 5cm. Draw the ray diagrams to show the formation of image if the lens is:
  1. Converging, and
  2. Diverging.
→
Draw a labelled diagram of the human female reproductive system. With the help of this diagram, explain the working of human female reproductive system.
→
Identify the compound X on the basis of the reactions given below. Also, write the name and chemical formula of A, B and C.
→
In the reaction represented by the following equation:$\text{CuO(s)}\ +\ \text{H}_2(\text{g})\xrightarrow{\ \ \ \ \ \ \ \ \ \ \ \ }\text{Cu(s)}\ +\ \text{H}_2\text{O(1)}$
  1. Name the substance oxidised.
  2. Name the substance reduced.
  3. Name the oxidising agent.
  4. Name the reducing agent
→