Assertion. Many female insects emit pheromones into the air.
Reason. Pheromones help the downwind malesto locate the females far away from them.

Assertion (A): Deer has strong teeth and long ears. Reason (R): The speed of deer helps them to run away from prey

Assertion: CO_(2) and water vapour present in the atmosphere absorb the re-emitted IR radiations from the earth's surface and warm the air. Reason: For greenhouse effect, presence of green plants is essential.

Assertion : Concave lens is used to correct myopia or short-sightedness. Reason : A concave lens of suitable focal length diverges the parallel rays from the distant objects as if they are coming from the far point of the myopic eye. This helps the eye lens to form a clear image at the retina.

Assertion: If there is a system of two unequal point charges of any polarity then there is one and only one point in space around it where the electric field intensity is zero. Reason: The direction of electric field intensity at a point is away from the positive charge and towards the negative charge, along the line joining the charge and location where electric field intensity is to be calculated.

Assertion: Electric field intensity at a point due to a positive charge is always opposite in direction to electric field intensity due to negative charge, and it is independent to locațions of charges. Reason: The direction of electric field due to a point charge is away from the positive charge and towards the negative charge along the line joining the point charge and location where the electric field is to be calculated.

Male Atlas Moth has huge antennae that can detect pheromone released by female moth from a distance of

Male Atlas Moth has huge antennae that can detect pheromone released by female moth from a distance of

Assertion (A): Lactation happens at the adolescent stage of a female. Reason (R): The secretion of diiferent hormones during the later stage of pregnancy helps in milk production.