Implantation of IUCD within five days of protected sex prevents _______.

How do the pills work ? (i) Inhibit ovulation and implantation (ii) Alter the quality of cervical muscus to prevent or retard the entry of sperms (iii) Inhibit spermatogenesis

Read of following statements and select the correct option Statement 1 : Subcutaneous implantation of synthetic progesterone prevents pregancy for about 5 years Statement 2 : A tiny amount of progesterone is steadily released from the inserts into the blood.

A lake near a village suffered heavy mortality of fishes within a few days. Consider the following reasons for this : 1. Lots of urea and phosphate fertilize were used in the crops in the vicinity 2 The area was spreyed with DDT by an aircraft 3. The lake was turned green and stinky 4. Phytoplankton populations in the lake declined initially therby greatly reducing photosybthesis.

Read the given statements and select the correct option Statement 1 : Use of condom is a safeguard against AIDS and sexual diseases besides checking pregnancy Statement 2 : Certain contraceptives are implanted under the skin of the upper arm to prevent pregnancy.

In a microbiology laboratory, the technician uses heat to sterilise the nutrient solution that is used to grow a fungus. When the heating system broke down, he sterilised the solution by passing it (in a sterile environment) through a sterile filter with a pore size of 0.2 micrometers. when the fungs was grown on the filtered nutrient solution, it stopped growing and looked unhealthy within a few days. which statements is the most likely explanation for the observed effects on the fungus ?

Select the correct option to fill up the blanks. (i) Diseases which are easily transmitted from one person to another, are called ______ diseases. (ii) In human body, parasite of malaria initially multiplies within the ____ and then attack the ______. (iii) _____ is the yellowish fluid secreted by mother during the initial days of lactation. (iv) _____ and ____ are the primary lymphoid organs.

Fill up the blank :Saheli contains a non-steroidal preparation called ____ to prevent implantation.

Oxygen in milligrams required for five days in one litre of water at 20^@ for the microorganisms to metabolise organic waste is called _______.

What are implants? How do they help in preventing fertilization?