Download App

Control and Coordination — Science STD 10 — Question

CBSE BoardEnglish MediumSTD 10ScienceControl and Coordination5 Marks
Question
A cylindrical structure P in our body begins in continuation with medulla and extends downwards. It is enclosed in a bony cage Q and surrounded by membranes R. As many as x pairs of nerves arise from the structure P. The structure P is involved in the reflex actions of our body and conduction of nerve impulses to and from another organ S of our body with which it forms CNS.
  1. Name the structure P.
  2. Name (i) bony cage Q, and (ii) membranes R.
  3. How much is x?
  4. Name the organs S.
  5. What are the reflexes involving structure P only known as?
✓

Answer

  1. The structure P is the spinal cord. It is a cylindrical structure that begins in continuation with the medulla and extends downwards.
  2.  
  1. The bony cage Q is the vertebral column. The spinal cord is enclosed by the vertebral column.
  2. R represents the meninges. The spinal cord is surrounded by membranes called the meninges.
  1. X represents the number of pairs of spinal nerves. They are 31 in number.
  2. S is the brain. The central nervous system consists of the brain and the spinal cord.
  3. The reflex actions involving the spinal cord (P) are known as spinal reflexes.

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 Control and Coordination→Control and Coordination — all question types→Science STD 10 question papers→CBSE Board STD 10 question papers→CBSE Board question paper generator→

Similar questions

A man bought a device X which could cook pulses, vegetables and rice without using any fuel like wood, coal, kerosene or LPG, etc. This device did not work at night. It also took a lot of time for cooking.
  1. Name the device X.
  2. What is the source of energy which cooks food in this device?
  3. What is the name of the process which traps energy in this device?
  4. State one advantage (other than saving on fuel) or using such a device for cooking food.
→
Complete the following cross word puzzle (Figure).
Across:
  1. An element with atomic number 12.
  1. Metal used in making cans and member of Group 14.
  2. A lustrous non-metal which has 7 electrons in its outermost shell.
​​​​​​​Down:
  1. Highly reactive and soft metal which imparts yellow colour when subjected to flame and is kept in kerosene.
  1. The first element of second Period.
  2. An element which is used in making fluorescent bulbs and is second member of Group 18 in the Modern Periodic Table.
  3. A radioactive element which is the last member of halogen family.
  4. Metal which is an important constituent of steel and forms rust when exposed to moist air.
  5. The first metalloid in Modern Periodic Table whose fibres are used in making bullet-proof vests.
→
A liquid X of colour Y circulates in the human body only in one direction: from body tissues to the heart. Among other things, liquid X contains germs from cells and dead cells. The liquid X is cleaned of germs and dead cells by a special type of white blood cells called Z. This cleaned liquid is then put into blood circulatory system in subclavian veins.
  1. What is (i) liquid X and (ii) colour Y?
  2. What are Z.
  3. The liquid X is somewhat similar to a component of blood. Name this component.
  4. Why is liquid X not red?
→
An object is kept at a distance of 100 cm from each of the above lenses. Calculate the
  1. Image distance and
  2. Magnification in each of two cases.
→
While conducting experiments to study the effect of various stimuli on the plants, it was observed that the roots of a plant X grow and bend towards two stimuli A and B but bend away from a third stimulus C. The stem of the plant X, however, bends away from stimuli A and B but bends towards the stimulus C. The stimulus B is known to act on the roots due to too much weight of the earth. Keeping these points in mind, answer the following question:
  1. What could stimulus A be?
  2. Name the stimulus B.
  3. What could stimulus C be?
  4. The branches of a fallen tree in a forest grow straight up in response to two stimuli. What could be these two stimuli out of A, B and C? Also name these two stimuli.
→
  1. Suggest an explanation for the fact that the chemicals produced by endocrine glands arc usually in the form of small molecules.
  2. Write any three endocrine glands and chemically produced by them.
→
State any five physical properties of metals and five physical properties of non-metals.
→
What are various ways to avoid pregnancy? Elaborate any one method.
→
State one use each of the following non-metals:
Hydrogen, Carbon (as Graphite), Nitrogen, Sulphur
→
Reproduction is essentially a phenomenon that is not for survival of an individual but for the stability of a species. Justify.
→