Sensitivity in living organisms
Oxford amazing science book 6 unit 3 sensitivity in living organisms
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00:003. Sensitivity in Living Organisms
00:04a. How do single-celled organisms respond to changes in their environment?
00:13Single-celled i.e. unicellular organisms respond to changes in their environment.
00:19In single-celled organisms, the whole cytoplasm is sensitive to changes in the environment.
00:26b. What is sensitivity?
00:40The ability of an organism to respond to a stimulus is called sensitivity.
00:45c. What are tropic movements?
01:06The movement of plants towards light and gravity are called tropic movements.
01:30d. How does auxin control tropic responses in plants?
01:39Auxin is a chemical substance which is made in the cells at the tips of the roots and
01:46shoots.
01:47Auxin speeds up the growth in stems and slows down the growth in roots.
01:59e. How do higher animals respond to changes in their environment?
02:11Higher animals respond to changes in their environment by taking appropriate action.
02:16f. What is coordination?
02:32Coordination is how it is brought about in our bodies.
02:35The working together of all the organs and systems of a body is called coordination.
02:52Coordination in the body is brought about by two systems, the nervous system and endocrine system.
03:00Fill in the Blanks
03:02a. Eyes, Ears, Nose, Tongue, Skin
03:08b. Sight c. Salty, Sweet, Sore, Bitter
03:12d. Smell e. Plants
03:15f. Auxin g. Brain
03:18h. Motor i. Auditory Nerve
03:21j. Semicircular Canals and Vestibule
03:25Columns are given as part and function.
03:29We have to match or arrange them according to the organs.
03:33Sensor organ
03:35a. Detects stimuli
03:37b. Eye spot
03:38h. Helps to detect changes in light intensity in a euglena
03:42c. Auxin
03:43d. Speeds up stem growth
03:45e. Brain
03:46h. Controls all parts of the body
03:49d. Ear
03:50e. Sensitive to the stimulus of sound
03:53a. Semicircular Canals
03:55m. Maintain the balance of the body
03:57b. Sweat glands
03:58c. Produce sweat
04:00d. Pupil
04:01e. Controls the amount of light entering
04:04i. Taste buds
04:07i. Sensitive to taste
04:09ii. Olfactory nerve
04:11iii. Connects the nose to the brain
04:24Skin
04:30Eye
04:33Ear
04:39This was the end of this lecture. Hope you liked it. Thank you for watching.
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04:45See you in the next video.