Assertion: Auxins help to prevent fruit and leaf drop at early stages.

Reason: Auxins promote the abscission of older mature leaves and fruits.

Q. Assertion: $\overrightarrow{\tau }=\overrightarrow{r}\times \overrightarrow{F}but\overrightarrow{\tau }\ne \overrightarrow{F}\times \overrightarrow{r}.$
Reason: Cross product of a vector is commutative.

Q. Assertion : Ethylene cause climacteric ripening of fruits
Reason : Climacteric fruits show a rise in respiration at the time of ripening.

Q.

Read the assertion and reason carefully to mark the correct option out of the options given below :

(a) If both assertion and reason are true and the reason is the correct explanation of the assertion.

(b) If both assertion and reason are true but reason is not the correct explanation of the assertion.

(c) If assertion is true but reason is false.

(d) If the assertion and reason both are false.

(e) If assertion is false but reason is true.

Assertion: Acetic acid does not undergo haloform reaction.

Reason: Acetic acid has no alpha hydrogens.

Q. Assertion : Amount of cyanocobalamine required daily is 3 mcg
Reason : Its deficiency causes pernicious anaemia

Q. Read the assertion and reason carefully to mark the correct option out of the options given below:
Assertion: Short wave bands are used for transmission of radio waves to a large distance.
Reason : Short waves are reflected by ionosphere
(a)If both assertion and reason are true and the reason is the correct explanation of the assertion.
(b)If both assertion and reason are true but reason is not the correct explanation of the assertion.
(c)If assertion is true but reason is false.
(d)If the assertion and reason both are false.
(e)If assertion is false but reason is true.