Optic Nerves

Q.

How does our brain interpret the image that is formed on the retina?

1. Wherever light falls that area becomes hot and thus by measuring the difference in hotness image is formed.

2. Light sensitive cells on retina get activated wherever light falls and generate electrical signals which are sent to the brain via the optic nerves.

3. Image is formed on the retina. we do not need the brain to interpret the image.

4. Cells are present in vitreous humour which help brain to perceive the image formed on retina.

Q. What is the function of optic nerve?

1. Keeps vitreous humour clear
2. Transmits electrical signal to brain
3. Forms image
4. Reduces the size of the pupil

Q. Signals generated by the light- sensitive cells in the human eye are sent to the brain via ___.

1. Retina
2. Pupil
3. All of these
4. Optic nerves

Q. Which among the following is called as the second cranial nerve?

1. Optic nerve
2. Cornea
3. Iris
4. Choroid

Q. List any four endangered species of animals in India. (2 Marks)

Q. Which of the following analogies explains the concept of in situ conservation?

1. Saving the tiger to save the forest
2. Saving the tiger as India’s national animal
3. Saving the forest to save the tiger
4. Saving the tiger to control deer populations

Q. What is the main reason that many species are becoming endangered?

1. Habitat Destruction
2. Disease
3. Acid rain
4. Natural Selection

Q. Which one of the following species is not included under the 'Red List'?

1. Extinct
2. Endemic
3. Endangered
4. Vulnerable

Q. When the number of organisms in a species decrease to the level of extinction, they are called species.

1. endangered
2. extinct
3. dangerous
4. endemic

Q. Match the following tiger reserves with state it is located in:

Tiger reserve	State
i. Bandipur	a. Uttarakhand
ii. Jim Corbett	b. West Bengal
iii. Sunderbans	c. Maharashtra
iv. Melghat	d. Karnataka

1. i-a, ii-b, iii-c, iv-d
2. i-c, ii-a, iii-d, iv-b
3. i-d, ii-a, iii-b, iv-c
4. i-d, ii-b, iii-c, iv-a