Related InterviewSolutions

• A women uses a device X made of a common metal for preventing pregnancy. This device works by preventing the implantation of fertilised egg cell (or embryo) in the female organ Y. (a) What are the two names of device X ? (b) Name the organ Y. (c ) Can this method of contraception protect a women from acquiring a STD?
• In the surgical method of birth control available for males, the structures A in the reproductive system are cur and ligated (tied up) at both ends. This prevents the reproductive cells B from coming out from the organs C where they are made in the male body. Since B connot come out from the male body, they connot fuse with cell D in the body of a female and hence pragnancy is prevented. (a) What are structures A ? (b) What are cells B ? (c ) Name the organs C. (d) What is cell D ? (e) What is the name of this surgical procedure for birth control available to males ?
• People who die from AIDS are not killed by the virus itself. Explain.
• What are the causative organism for the following diseases ? (i) Gonorrhoea (ii) Syphilis (iii) AIDS
• The male gametes in a flower and in a human are produced sperm in:A. stigma and ovaryB. anther and styleC. ovary and testesD. radicle
• When an insect sits on the flower of a plant them some particles A present in the top of little stalks in the flower attach to its body hair. When this insect now sits on the flower of another similar plant, then particles A attached to the hair of insect are put on the top of a flask-shaped organ at the centre of flower. The particle A grows a long tube B from the top of flask-shaped organ through which C moves down and reaches the bottom part of flask-shaped organ. Here C fuses with the nucleus of D contained in structure E. the fusion of C and D forms a new cell F wich grows and develops into a seed of the plant.? (a) What are particles A ? What is the process of transferring A from one flower to another flower of similar plant by the insect of known as? (b) What is the name of tube B? (c) What is C which moves down through the tube B? ltbr? (d)Name D and E. (e) What is F?
• The flask-shaped organ A at the centre of a flower is surrounded by a number of little stalks B having swollne tops which lie just inside the ring of petals. (a) Name A. What are the various parts of A ? (b) Which part of A contains gametes ? (c) Name B. What is the swollen top of B known as ? (d) What does the swollen top pf B contain ? (e) Out of A and B, which one is (i) male part, and (ii) female part of the flower ?
• When the branches of a plant growing in the field are pulled towards the ground and a part of them is convered with moist soil (leaving the tips of the branches exposed above the ground), then after some time new roots develop from the parts of branches buried in ths soil. On cutting these branches from the parent plant new plants are produced from the cut parts of branches which had developed roots. (a) What is this method or propagation of plants knows as ? (b) What type of branches should a plant have to be able to be propagated by this method? (c) Name any two plants which are grown for thier fruits and propagated by this method (d) Name any two plants which are grown for thier fruits and propagated by this method (e) Name of plant which gets propagated by this method naturally by forming runners (soft horizontal stem running above the ground)
• A scientist removed some cells from the growing point of a plant and placed it in a suitable medium leading to the formation of a shapeless lump of mass X,Y is then transferred to another medium which stimulates it to develop roots. Whem X which developed roots is placed in a yet aniother medium, then it develops shoots to from tiny plantlets. These plantlets can then be transplanted in pots or soil where they can grow to form mature plants. (a) What is the shapeless lump of mass X known as ? (b) What name is given to this method of producing new plants ? (c) The growth medium used in this method contains palnt nutrients in the form of jelly . Name this jelly. (d) What is the general name of chemicals used to stimulate the growth of palnt cells and development of roots and shoots? (e) Name any two plants which are produced by this method. (f) State any two advantage of this method of producing plants (g) What is the other name of thsi method [other than that given in (b) above ?
• (a) What is a tuber? Name one stema tuber and one root tuber. (b) What is name of organ of propagation present in a tuber ? (c) Name one commonly used vegetable which is propagated by using tubers.