Larkspur,$Ranunculus$,and cotton plants are similar in the presence of

The deteriorative processes in plants that naturally terminate their functional life are collectively called

Go through the following pairs and choose the correct pairs from the options given below:

$I$. Nerium	Sunken stomata	Lower epidermis of leaves to reduce loss of water
$II$. Calotropis	Non-succulent	Root cells with thickened cell walls
$III$. Peperomia	Leaf succulent	Leaf epidermal cell,store water
$IV$. Ammophila	Dicot	Curl their leaves to minimise loss of water
$V$. Tribulus	Ephemeral	Water is stored in stem

Plants follow .....$A$.... pathways in response to environment or phases of life to form different kind of structures. This ability is called ....$B$...... Complete the given statement with the correct combination of options.

Plasticity means

Define the term 'stress' for plants. Discuss briefly the two types of stress encountered by plants.