• The onion plant has bluish-green leaves and its bulb at the base of the plant begins to swell when a certain day-length is reached. The bulbs are composed of shortened, compressed, underground stems surrounded by fleshy modified scale leaves that envelop a central bud at the tip of the stem.
  
• Underground stems are modified plant structures that derive from stem tissue but exist under the soil surface. Turmeric is the rhizome or underground stem.
  
• In racemose inflorescence,  the growing region at the tip of the flower stalk continues to produce new flower buds during growth. As a result, the youngest flowers are at the top and the oldest flowers are at the base of the stalk. Mustard shows racemose inflorescence. Cyme inflorescence is present in Solanum. A Cyme is a group of flowers in which the end of each growing point produces a flower, so new growth comes from side shoots and the oldest flowers are at the top.
• Phylloclade is a flattened branch or stem-joint resembling and functioning as a leaf. Phylloclade is a stem modification for deserts like area in which the stem becomes broad and fattened (in Opuntia) or cylindrical (in euphorbia)

• Suberin is a cell wall constituent that forms gas and watertight layers. It is part of the Casparian strip of the root endodermis, where it acts as a diffusion barrier between the apoplast of the root cortex and the central cylinder.
• Suberin is present in many C4 plants as an impermeable layer between the bundle sheath and mesophyll cells.
  

The venus fly trap which looks and smells like a flower to insects. When they land on it, they touch a trigger hair which slams the trap shut and they are then digested by the plant.

The insectivorous plants are the carnivorous plants which feed on the insects. These plants have adapted to grow in the extreme conditions of the soil such as acidic pH. Generally, these plants are known to grow in the soil which is deficient in the mineral nutrients due to the presence of acid. The plant can grow in the soil which have low levels of nitrogen. 

• Cuscuta is a large and widely distributed genus of twining leafless parasitic herbs.
• Viscum is a common example of partial stem parasites, which grow as parasitic epiphytes on host plants. But it can carry out photosynthesis and manufacture their own food.
• Rafflesia is a parasitic plant that lacks chlorophyll and contains a single very large flower.
• Orobanche is the genus of more than 200 species of the parasitic nature plants.

So, option B is correct.

Aldrovanda vesiculosa, also famous as the waterwheel plant. This plant captures small aquatic invertebrates using water flea traps. The traps are arranged in spirals around a central, free-floating stem. This is one of the rare plant species capable of rapid movement.

So option B is correct.

A) Tendrils are the modification of leaves that help climbers to climb the support.

Leaf pitcher is found in Nepenthes is a modified leaf which is converted into a lid to capture small insects and digest it to overcome nitrogen deficiency.

Leaves of some plant get modify to form tendrils. These are thin, wiry, and spirally coiled. It holds the support by coiling around it and help the weak stem to climb the support.

1. Onion leaves are modified to store food and water called scale leaves.
2. Opuntia or prickly pear leaves modified into spines for defensive purpose.
3. Nepenthes leaves are modified into leaf-pitcher to trap insects so that they fulfill their nitrogen deficiency.
4. Utricularia is an insectivorous plant that grows in water and their leaves get modified to leaf-bladder for digesting insects.

Areoles are the evolutionary modification in the cacti. These modifications give rise to spines and glochids which are the means of self-defense. These spines effectively cover the cacti. These evolved as abortive branch buds while their spines evolved as vestigial leaves.

'Fleshy scale leaves' in garlic and onion are edible plant parts.

The leaves close under various other stimuli, such as touching, warming, blowing, or shaking. ... The stimulus can also be transmitted to neighboring leaves. It is not known exactly why Mimosa pudica evolved this trait, but many scientists think that the plant uses its ability to shrink as a defense from herbivores. So, the correct option is "C" (Leaf movement).

In Duranta, axillary buds and in Carrisa the apical bud is modified into stem thorns, for ulex both stem thorns as well as leaf spines are modified.
Hence, option D is correct.

Leaves are those parts of plants that perform the primary function of photosynthesis and transpiration. Growth, Reproduction and Protection are it's secondary or modified functions.

The plant is morphologically divided into roots, stem and leaves.

A)The midrib is the large strong the central vein in the middle of the leaf.
B)Stomata are the part of leaf present on the epidermis and help in the gaseous change.
C)Veins are the vascular tissue of leaf located at the mesophyll part.
D)The petiole is the part of a leaf that joins the lamina to the base.
So the correct option is 'Stomata'

A) The midrib is the large strong central vein in the middle of the leaf.
B) The lamina is the broad green part of the leaf in which photosynthesis takes place.
C) Leaf base is the lowermost part of the leaf from where it attaches to stem or branch.
D) Stamen is the male reproductive part present on a flower.
So the correct option is 'Stamen'.

Plants with both submerged and floating or emerged leaves show hetrophylly or occurrence of more than one type of leaves. Eg Ranunculus, Aquatilis 

The leaf of Mimosa pudica is bipinnately compound. It contains leaflets arranged in opposite arrangement on the rachis. It has unipnnate leaves instead of single leaflets in the opposite direction on the rachis.

Venation is the arrangement of veins on the leaves. It is basically of 2 types, reticulate and parallel. Reticulate venation involves irregular distribution of veins to form a network. Parallel venation involves the veins running parallel to each other. In pinnate or unicostate venation, the lamina has a single principal vein or midrib. It produces lateral veins. In palmate or multicostate venation, lamina has more than one principal vein. In Canna, the venation is pinnately parallel. 

Venation is the arrangement of veins on the leaves. It is basically of 2 types, pinnate and palmate. In pinnate or unicostate venation, the lamina has a single principal vein or midrib. It produces lateral veins. In palmate or multicostate venation, lamina has more than one principal vein. Castor has palmate type venation of leaf blade. Cosmos is an example of pinnate type venation of leaf blade. Thus, the correct answer is 'Cosmos.'

Compound leaves are of two types, namely pinnately compound leaves and palmately compound leaves. In palmately compound leaf, the leaflets are arranged at the tip of the petiole. It is further divided into 5 types depending upon the number of leaflets present at the tip of the petiole.

In unifoliate, there is only one terminal leaflet is attached at the top of petiole. Example includes citrus.

In bifoliate, two leaflets are attached side by side at the terminal end of petiole. Example includes Balanites roxburghii.

In trifoliate, three terminal leaflets are attached at the terminal end of petiole. Example includes Aegle marmelos.

In quadrifoliate, four leaflets are attached to the tip of petiole. Example includes Paris quadrifolia.

In multifoliate, five or more leaflets are present at the tip of petiole in the form of fingers of the palm. Example includes Parthenium (common weed).

Thus, the correct answer is 'Multifoliate.'