Q18 of 216 Page 478

i. List the sequence of events that occur during the process of photosynthesis.

ii. List the three kinds of blood vessels of human circulatory system and write their functions in tabular form.

(i) The sequence of events that occur during the process of photosynthesis are:


(a) Adsorption of light energy by the chlorophyll pigment.


(b) Conversion of light energy into chemical energy.


(c) Splitting of water molecules into hydrogen and oxygen.


(d) Formation of carbohydrates from CO2 gas.


(ii) There are three types of blood vessels


• Arteries


• Veins


• Capillaries



More from this chapter

All 216 →
16

i. Identify the acid and the base whose combination forms the common salt that you use in your food. Write the formula and chemical name of this salt. Name the source from where it is obtained.

ii. What is rock salt? Mention its colour and the reason due to which it has this colour.


iii. What happens when electricity is passed through brine? Write the chemical equation for it.


OR


i. Write the chemical name and chemical formula of washing soda.


ii. How is it obtained from sodium chloride? Give equations of the reactions.


iii. Why it is called a basic salt? Give its any one use.

 17

An element placed in 2nd Group and 3rd Period of the Periodic Table, burns in presence of oxygen to form a basic oxide.

i. Identify the element.


ii. Write the electronic configuration.


iii. Write a balanced equation when it burns in the presence of air.


iv. Write a balanced equation when this oxide is dissolved in water.


v. Draw the electron dot structure for the formation of this oxide.

 19

i. Write the functions of each of the following parts in a human female reproductive system:

A. Ovary B. Uterus


C. Fallopian tube


ii. Write the structure and functions of placenta in a human female.

 20

i. Define the following terms in the context of spherical mirrors:

A. Pole


B. Centre of curvature


C. Principal axis


D. Principal focus


ii. Draw ray diagrams to show the principal focus of a:


A. Concave mirror


B. Convex mirror


iii. Consider the following diagram in which M is a mirror, P is an object and Q is its magnified image formed by the mirror.


State the type of the mirror M and one characteristic property of the image Q.



OR


i. Draw a ray diagram to show the formation of image by a convex lens when an object is placed in front of lens between its optical centre and principal focus.


ii. In the above ray diagram mark the object-distance (u) and the image-distance (v) with their proper signs (+ve or –ve as per the new Cartesian sign convention) and state how these distances are related to the focal length (f) of the convex lens in this case.


iii. Find the power of a convex lens which forms a real, and inverted image of magnification-1 of an object placed at a distance of 20 cm from its optical center.