Q19 of 216 Page 478

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.

(i) A. Ovary- They produce oocytes (eggs) for fertilisation, and they produce the reproductive hormones oestrogen and progesterone.


B. Uterus- The function of the uterus is to accept a fertilized ovum which passes through the utero-tubal junction from the fallopian tube (uterine tube).


C. Fallopian tube- The function of the fallopian tube is to transport the egg from the ovary to the uterus.


(ii) The placenta is a disc-shaped structure formed on the uterine wall just before the implantation of the gastrulocyte (embryo). The functions of placenta are:


(a) It helps in transporting substances such as oxygen, carbon dioxide, glucose, amino acids, fatty acids and glycerol, antibodies and waste products, etc.


(b) It transforms as an endocrine gland secreting progesterone and oxytocin.


(c) It provides attachment to the embryo and nourishment.


More from this chapter

All 216 →
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.

 18

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.

 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.

 21

i. Two identical resistors each of resistance 10Ω are connected in

A. Series


B. Parallel to a 6 V battery


Calculate the ratio of power consumed in the combination of resistors in two cases.


ii. Draw the circuit diagram of the two cases.


Ans. i. 4 : 1