Due to revolution of the earth and also due to inclined axis of the earth,
there is a change in the time span of day time and night time. Which of the
following are correct?
1. In Northern hemisphere, between 22nd March and 23rd September the days are
long and nights are short.
2. In Northern hemisphere, between 22nd March and 23rd September the days are
short and nights are long.
3. in Southern hemisphere, between 23rd September to 22nd March the days are long
and nights are short.
4. In Southern hemisphere, between 22nd March to 23rd September the days are short
and nights are long.
a. 1, 2 and 3
b. 2, 3 and 4
c. 1, 3 and 4
d. 1, 2 and 4
Answers
Answer:
After recovering from infection of ringworm, Reena thought that all fungi are harmful for human kind, as these spoil food and cause various diseases. But her elder sister told him that not all fungi are harmful, some are quite useful such as in making bread, vitamins, Medicines (antibiotics) and in decomposing organic wastes.
(i) Name any fungus which is used in bread making.
(ii) Name any fungus which is the source of some medicine.
​(iii) What ecological benefit is shown by fungi?
1, 3, and 4 statements are correct, i.e, option (C) is correct.
• In Northern hemisphere, between 22nd March and 23rd September, the days are long and nights are short. This is because in this period, it is summer in the Northern Hemisphere as this part of the Earth is tilted towards the Sun and receives light from it. Therefore, the days are longer and the nights are shorter between 22nd March and 23rd September in the Northern Hemisphere.
• In Southern hemisphere, between 23rd September and 22nd March, the days are long. This is again due to the revolution and inclination of the Earth towards the Sun. In this period, the Southern Hemisphere is faced towards the Sun, due to which it receives direct light from the Sun. Therefore, it is summer in this hemisphere during this period, causing the days to be longer than the nights.
• In Southern hemisphere, between 22nd March to 23rd September, the days are short and the nights are long. This is because it is winter during this period in the Southern Hemisphere, due to which the days are short and the nights are long.