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(D) The shedding of leaves in winter is a complex physiological process triggered by environmental factors.$1$. The shortening of day length $(photope

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(D) The shedding of leaves in winter is a complex physiological process triggered by environmental factors.$1$. The shortening of day length $(photoperiodism)$ and the fall in temperature act as external signals that initiate the process of leaf senescence.$2$. In response to these signals,a specialized zone called the $abscission$ $layer$ forms at the base of the petiole.$3$. This layer consists of thin-walled,cambium-like cells that are rich in protoplasm and starch.$4$. Enzymes such as $cellulases$ and $pectinases$ are secreted,which degrade the middle lamella and cell walls,causing the leaf to detach from the branch.Therefore,all the mentioned factors contribute to this process.

Column $I$ (Precursor/Term)	Column $II$ (Associated Hormone)
$(a)$ Tryptophan	$(i)$ Cytokinin
$(b)$ Mevalonic acid	$(ii)$ Abscisic acid
$(c)$ Kinetin	$(iii)$ Gibberellins
$(d)$ Dormin	$(iv)$ Auxin

Column-$I$	Column-$II$
$A$. Plant growth promoters	$1$. Auxin
$B$. Plant growth inhibitor	$2$. Gibberellin
	$3$. Abscisic acid
	$4$. Cytokinin

Leaves fall off from branches in winter due to

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The process of soaking rice in water to induce germination is known as $..........$.

While eating watermelons, all of us wish it was seedless. As a plant physiologist, can you suggest any method by which this can be achieved?

Match column $I$ with column $II$ and select the correct option:
Column $I$ (Precursor/Term) Column $II$ (Associated Hormone)
$(a)$ Tryptophan $(i)$ Cytokinin
$(b)$ Mevalonic acid $(ii)$ Abscisic acid
$(c)$ Kinetin $(iii)$ Gibberellins
$(d)$ Dormin $(iv)$ Auxin

Match the following columns:
Column-$I$ Column-$II$
$A$. Plant growth promoters $1$. Auxin
$B$. Plant growth inhibitor $2$. Gibberellin
$3$. Abscisic acid
$4$. Cytokinin

Select the correct matching for $A$ and $B$.

During experimentation, why is it difficult to attribute any observed effect to a single hormone?

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