Assertion and reason based questions of class 10 CBSE science chapter life process and reproduction you may send mañy questions you want and explain the answer also please
Answers
Given below are some important short answer kind inquiries to steel oneself against CBSE category ten Science examination 2019:
1. (a) Why are most carbon compounds poor conductors of electricity?
(b) Write the name and structure of a saturated compound during which the carbon atoms are organized during a ring. offer the quantity of single bonds gift during this compound.
Answer.
(a) Carbon compounds type valency bonds. they are doing not dissociate into ions and don't have charged particles (ions) to hold current.
2. Name the hormones secreted by the subsequent endocrine glands and specify one operate of each:
(a) Thyroid
(b) Pituitary
(c) duct gland
Answer.
(a) endocrine} hormone is secreted by thyroid. It regulates supermolecule supermolecule and metastasis for balance of body growth.
(b) ductless gland secrets human growth hormone. It regulates growth and development of body.
(c) duct gland secrets hypoglycemic agent. It regulates/decreases the blood glucose level.
Pancreas additionally secrets hormone that regulates /increases blood glucose level.
3. offer an evidence for the formation of a rainbow.
Answer.
Rainbow is created thanks to the dispersion of daylight by raindrops suspended in air. Water drops act like little prisms. once daylight enters into a spherical rain¬drop, it's refracted and spread. the various colors of sunshine bent in numerous angles. once totally different colors of sunshine fall on the rear inner surface of drop, they endure total internal reflection. The water drop once more refracts the various colors, whereas kicking off of the drop. once deed the drop totally different colors commence to create a rainbow.
4. however are we tend to ready to see distant and close objects clearly? that a part of eye helps in dynamical curvature of lens? Why no image is created at blind spot?
Answer.
We can see distant and close to objects clearly due to the property of accommodation of eye. Accommodation is that the name given to the power of the lens of the attention to vary its focal distance and manufacture centered pictures of each distant and close to objects on the tissue layer.
Cilary muscle helps in dynamical curvature of the lens. they're hooked up to the lens and contract or unharness to vary the lens form and curvature.
No image is created at blind spot as a result of there aren't any photoreceptors, i.e., cones and rods to sight the sunshine and send it to brain.
5. (a) Why magnification is taken negative for real pictures and positive for virtual images?
(b) Why convexo-convex mirror is employed in rear read mirrors and not concave mirror?
Answer.
(a) If image is real, it'll be inverted which implies height of image are taken as negative. Also, the peak of object is often positive.
currently as magnificati of image / Height of object.
Therefore, just in case of real image,
Magnificati of image (-) / height of object (+)=Negative.
So, Magnification are negative.
Similarly, if image is virtual, it'll be erect.
Therefore, just in case of reflexion,
Magnificati of image (+) / height of object (+)= Positive
So, Magnification are positive.
(b) convexo-convex mirror is often utilized in rear read mirrors in vehicles as a result of it provides associate degree erect, virtual, full size diminished image of distant objects with a wider field of read. Thus, convexo-convex mirrors alter the motive force to look at a lot of larger space that isn't doable with a concave mirror.