Control and Coordination in Living Organism ~ LIFE SCIENCE Chapter 1(class 10 wbbse) ( Important Short questions & Notes )

 

MADHYAMIK  LIFE SCIENCE   SUGGESTION

Control and Coordination in Living Organism

Short Question's Answer 

1. Give the definition of movement.

Ans. The process by which living beings can move any part of their body spontaneously or under the influence of external stimuli is called movement.

2. Define locomotion.

Ans. The process by which living beings can change the place of their whole body spontaneously or in response to external stimuli is called locomotion.

3. What is chemotactic movement ?

Ans. The tactic movement controlled by the chemical substances is called chemotaxism or chemotactic movement; e.g. in ferns male gamete move towards the female reproductive organ in presence of malice acid.

4. What is tropic movement? 

Ans. When the movement of curvature in plants determined by the direction of external stimuli is called the tropic movement of tropism.

5. What is hydrotropism ?

Ans. The direction of the movement of a plant organ is determined by the source of water is called hydrotropic movement or hydrotropism.

6. What is chemonasty movement ?

Ans. The nastic movement controlled by the intensity of chemical substance is called chemonasty ; e.g. the leaflets of insectivorous plants gradually enclose when they come of an in contact of insect .

7. What is seiosmonasty ?

Ans. The nastic movement induced by shock generated by touch or injury is called seismonasty; e.g. Lajjabati

8. Give the name of a synthetic hormone in plants?  

Ans. Naphthalene acetic acid (NAA)

9. What is the chemical name of Auxin ?

Ans. Indole acetic acid.

10. Which hormone control tropic movement? 

Ans. Auxin

11. Which hormone influences germinating seeds?

Ans. Gibberellin.

12. What is the role of synthetic hormone 2, 4-D ?

Ans. Prevent shedding of immature organs in plants and weeds control in the paddy field, wheat etc.

13. What is the full form of ACTH ?

Ans. Adreno cortico trophic hormone. 

14. Which hormone is called growth hormone?

Ans. Somatotrophic hormone. 

15. From where Adrenalin secretes ?

Ans. Medulla part of Adrenal gland.

16. Why Adrenalin is called emergency hormone? 

Ans. During emergent condition ( fear, anxiety , emotional condition etc. ) adrenalin is a to fight out the situation successfully.

17. Which hormone forms placenta in female body? 

Ans. Progesterone.

18. Give the site of testosterone hormone? 

Ans. Interstitial cells of leydig  of testis.

19. Where does Nissl bodies are presence and absence in a neurone ?

Ans. Present in cell body and dendron  but absent in axon and dendrites.

20. What is afferent (sensory) nerves? 

Ans. Those nerves which are made up of sensory neurons and transmit nerve impulse from the receptors to central nervous system are called afferent nerves.

21. Give the name of a mixed nerves? 

Ans. Vagus nerve.

22. What is the full name of CSF ? 

Ans. Cerebrospinal fluid. 

23. Give the name of the afferent nerves ?

Ans. Olfactory, Optic nerve

24. What is ganglion ?

Ans. A group of nerve cell bodies united and sheathed by connective tissue and located outside of the central nervous system is called ganglion.

25. What is the function of acetylcholine as neurotransmitter ?

Ans. Carry forward impulse one neurone to another next neurone.

26. What is the function of medulla oblongata ?

Ans. It regulates the respiration, cardiac activities and visceral reflexes. 

27. What is reflex action ?

Ans. Reflex action is a spontaneous involuntary (automatic) motor response due to sensory stimulus.

28. What is the function of lens of eye ?

Ans. Refraction of light.

29. What is the name of innermost light sensitive layer of eye ?

Ans. Retina 

30. Rod or Cone ; which cells are present maximum on yellow spot of human eye ?

Ans. Rod cells.

31. What is the yellow spot of eye ?

Ans. The particular area on the retina , the inner layer of eye almost at the centre of the horizontal axis of the eyeball is called yellow spot.

32. What is sclera ?

Ans. The outermost posterior 5/6 portion of the eyeball is called sclera.

33. What is cornea ?

Ans. The anterior 1/6 portion of the eyeball is called cornea.

34. What is vitreous humor ?

Ans. A clear gelatinous fluid is present in between the lens and retina of eye ball.

35. What is the locomotory organ of earthworm ? 

Ans. Seta 

36. Number and name of fins present in fish ?

Ans. 2 Pectrol, 2 Pelvic , 1 anal , 1 causal (tail),  1 dorsal fins; total – 7 find are present in fish.

37. What is the function of tail or causal fin ?

Ans. It acts as a steering, with the help of causal fin , the fish changes direction.

38. What is the number of air sac present in bird ?

Ans. 9

39. What is the locomotory organs of fishes ?

Ans. Fins, myotome muscles and swim bladder.

40. Give an example of ball and socket joint ? 

Ans. Hip joint.

41. What is the location and function of synovial fluid ?

Ans. Movable joints of bones , a viscous fluid is found called synovial fluid and resists the erotion of the bones during movement. 

42. Give an example of a pivot joint ?

Ans. Between first and second vertebrae. 

43. What is flexor muscle? 

Ans. Contraction of these muscle cause flexor movement , in which two bones held together by a joint, come close to each other. 

44. What is the function biceps muscle? 

Ans. Present in the anterior side of the upper arm and facilate to fold hand.

45. What is tendon ?

Ans. Skeletal muscles are attached with the bones flat connective tissue called tendon.

46. What is ligament? 

Ans. Thread like structure which connects between bones is called ligament. 

47.  What is the balancing part of the human body?

Ans. Cerebellum of posterior brain and semicircular canals of internal ear.