Science [5 marks Questions]

i. Plant growth movements in response to stimuli in a particular direction/directional movements due to light, gravity etc. Is known as tropic movement.
- Plant growth inhibitor: Abscisic Acid
- Promotes cell division - Cytokinins
ii. When the tendrils come in contact with any support, auxins move away from the point of contact of the support. More growth occurs on the side away from the support. As a result, unequal growth occurs on its two sides and thus tendrils coil/ circle around the support.
Hormone - Auxins

i. Use of condoms are beneficial for both the sexes as it prevents the spread of sexual transmitted diseases (STDs).
- condoms which are put on penis( in males) and on vagina (in females) before starting coital activity .
- These are popularly called Nirodh.
- These are very widely used contraceptives in India because they are easily available, low cost, reliable, effective, and with no side effects .these also prevent the spread of sexually transmitted diseases like AIDs, syphilis,etc.
ii. - Physiological devices such as oral contraceptives are taken through mouth .
- These contain a combination of synthetic progestins (acting like progesterone) and estrogens, so-called combined pills.
- These combination inhibit the secretion of FSH and LH from anterior lobe of pituitary gland. These also retarded the entry of sperms in the uterus.
iii. Sex selective abortion is aborting a child on the basis of sex .it effects a healthy society in most negative way as it disturbs the sex ratio in the population and now a sex selective abortion is a crime.