Class 10 Science - Chapter Control and Coordination NCERT Solutions | The brain is responsible for (a) thin

Draw the structure of a neuron and explain its function.

Which signals will get disrupted in case of a spinal cord injury?

How does chemical coordination take place in animals?

Compare and contrast nervous and hormonal mechanisms for control and coordination in animals.

Why is the use of iodised salt advisable?

How do we detect the smell of an agarbatti (incense stick)?

How do auxins promote the growth of a tendril around a support?

Which part of the brain maintains posture and equilibrium of the body?

How does our body respond when adrenaline is secreted into the blood?

What are plant hormones?

Did Döbereiner’s triads also exist in the columns of Newlands’ Octaves? Compare and find out.

What is a good source of energy?

Why is diffusion insufficient to meet the oxygen requirements of multi-cellular organisms like humans?

What are trophic levels? Give an example of a food chain and state the different trophic levels in it.

What changes can you make in your habits to become more environment-friendly?

What is the importance of DNA copying in reproduction?

If a trait A exists in 10% of a population of an asexually reproducing species and a trait B exists in 60% of the same population, which trait is likely to have arisen earlier?

Why should a magnesium ribbon be cleared before burning in air?

Define the principal focus of a concave mirror.

You have been provided with three test tubes. One of them contains distilled water and the other two contain an acidic solution and a basic solution, respectively. If you are given only red litmus paper, how will you identify the contents of each test tube?

What are the qualities of an ideal source of energy?

Why does the sky appear dark instead of blue to an astronaut?

Compare the power used in the 2 Ω resistor in each of the following circuits:

(i) a 6 V battery in series with 1 Ω and 2 Ω resistors, and (ii) a 4 V battery in parallel with 12 Ω and 2 Ω resistors.

The refractive index of diamond is 2.42. What is the meaning of this statement?

Write the balanced equation for the following chemical reactions.

1. Hydrogen  +  Chlorine  →  Hydrogen chloride
2. Barium chloride  +  Aluminium sulphate  →  Barium sulphate  +  Aluminium chloride
3. Sodium  +  Water  →  Sodium hydroxide  +  Hydrogen

10 mL of a solution of NaOH is found to be completely neutralised by 8 mL of a given solution of HCl. If we take 20 mL of the same solution of NaOH, the amount HCl solution (the same solution as before) required to neutralise it will be

  (a) 4 mL          (b) 8 mL          (c) 12 mL          (d) 16 mL

Which uses more energy, a 250 W TV set in 1 hr, or a 1200 W toaster in 10 minutes?

What are the differences between autotrophic nutrition and heterotrophic nutrition?

The autotrophic mode of nutrition requires

         (a) carbon dioxide and water.         (c) sunlight.
         (b) chlorophyll.                                (d) all of the above.

Why is variation beneficial to the species but not necessarily for the individual?