Meiosis is an essential event in the sexual life cycle of any organism. Give two reasons.
a. To maintain constant number of chromosomes by reduction cell division.
b. Does not bring variation in offspring
c. Both a & b are correct
d. None of these

Which of the following is a significance of meiosis division ? A. Conservation of chromosome number across generation. B. Reduction in chromosome number by half. С Creates genetic variations. D All of the above.

Fill in the blanks with suitable words: (a)Somatic cells multiple by………(b)Mitosis results in the formation of nuclei havind …….number of chromosomes.(c)The second division of meiosis by described as……division.(d)The region of the attachment of chromosomes to spindle fibre is called.......(e)In meiosis,haploid conidition is reached by...... stage.

Pick up the CORRECT statement from the following : a. The spindle formation is anastral in plant cell while amphiastral in an animal cell. b. DNA replicates once in mitosis and twice in meiosis. c. Equational division, as well as reduction division, occurs in both sexually and asexually reproducing organisms.

Assertion: In triangles ABC and PQR, angleA= angleP, angleC= angleR and AC=PR . The two triangles are congruent by ASA congruence. Reason : If two angles and included side of a triangle are equal to the corresponding angles and side of the other triangle then the triangles are congruent by ASA congruence criteria. (a) Assertion and reason both are correct and reason is the correct explanation for the assertion. (b) Assertion and reason both are correct and reason is not the correct explanation for the assertion. (c) Assertion is correct but reason is wrong. (d) Reason is correct but assertion is wrong.

If two events are independent then (a) They must be mutually exclusive (b) Sum of their probabilities must be equal to 1 (c) (a) and (b) are both correct (d) None of the above is correct

Give below are assertion and reason. Point out if both are true and reason is correct explanation (A), both true but reason is not correct explanation (B), assertion is true but reason is wrong (C), both are wrong (D). Assertion. Megaspore mother cell undergoes meiosis to produce four megaspores. Reason. Megaspore mother cells and megaspores both are haploid

These questions consists of two statements each printed as Assertion and Reason. While answering these question you are required to choose any one of the following five reponses (a) If both Assertion and Reason arecorrect and Reason is the correct explanation of Asserrtion. (b) If both Assertion and Reason are correct but Reason is not the correct explanation of Assertion. (c ) If Assertion is true but Reason is false. (d) If Assertion is false but Reason is true. Assertion The work done in bringing a body down from the top to the base along a frictionless inclined plane is the same as the work done in bringing it down from the vertical side. Reason The gravitational force on the body along the inclined plane is the same as that along the vertical side.

Read the assertion and reason carefully to mark the correct option out of the options given below: (a) If both the assertion and the reason are true and the reason is a correct explanation of the assertion (b) If both the assertion and reason are true but the reason is not a correct explanation of the assertion (c) If the assertion is true but the reason is false (d) If both the assertion and reason are false (e) If the assertion is false but reason is true Assertion : An artifical pacemaker can replace the sinoatrial node of heart. Reason : This is because, an artifical pacemaker is capable of stimulating the heart electrically to maintain its beats.