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National Moon Day is celebrated to commemorate man’s first lunar landing on the moon. On July 21, 1969, Apollo 11 carried the first humans to the moon. Neil Armstrong spent two and a half hours on the surface of the moon on this day.

Christina Koch spent 328 days on the International Space Station (ISS), surpassing the previous record held by fellow American Peggy Whitson.
Peggy Whitson is the woman who spent most time in space ie, for 665 days 22 hours 22 minutes.

Un a snellrn’s chart , letters, numerals or symbols are recorded in seven lines in different sizes . The primary testing of vision is done by checking the number of lines you can read properly from top to bottom.

Epiphytes – Plants which depend other plants only for shelter. eg; Vanda
Parasites – plants which depends on other plants .
Semi parasites – plants that absorb water and minerals from the host plant and perpare their own food with the help of their leaves . eg ; Loranthus , Sandalwood
Total parasites – plants that absorb food directly from the host plants . eg; Cuscutta , rafflesia .

Mangroves are special kind of plants growing in marshy areas . The tip of their roots grow towards the atmosphere . These roots that help in gaseous exchange are called pneumatophores .

When the moon comes between the earth and the sun in a straight line , the earth comes in the shadow of the moon . Then the shadow of the moon falls on the earth . The sun cannot be seen from the area where the shadow falls . This is solar eclipse .

Objects which allow light to pass through them partially are called translucent object . Borosilicate is a transparent object which allow light to pass through them completely .

Sweet potato , hydrocotyle, strawberry etc are creepers .
Climbers are week stemmed plants and climb on other plants with the support of spring like parts called tendrils . eg ; Pepper, bitter gourd , snake guord etc .

A simple solution is basically two substances that are evenly mixed together.
One of them is called the solute and the other is the solvent.
A solute is the substance to be dissolved.
The solvent is the one doing the dissolving (water).
Solute in less quantity wheras solvent in more quantity .
Solute and solvent when mix up is called a solution .
In soda water Carbon dioxide is the solute and water is the solvent .

Cylindrical type of lenses is prescribed for the correction of astigmatism of the human eye.

A keratometer may also be used to estimate astigmatism by finding the difference in power between the two primary meridians of the cornea.

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