Root and Root modifications- Practice Test 4

Answer: Option D

Explanation

Adventitious root system is commonly foud in monocotyledonous plants and pteridophytes.

Answer: Option B

Explanation

All the plants mentioned above store their reserve food in their roots. Raphanus sativus stores the reserve food and becomes fusiform shaped, Daucus becomes cone shaped. Ipomea has a single tuberous root at each node. Ruellia has a number of tuberous roots are found in clusters at the base of the stem. Beta vulgaris stores food material is in the form of sugar. Hence option D is correct.

Answer: Option D

Explanation

Fibrous root system is excellent for providing good anchorage for the plant. The following are characteristic features of this root system:

• This is the most common type of root system found in monocotyledonous plants and pteridophytes.
• A bunch of uniform roots arise from the base of the stem.
• These roots are slender, shallow and develop equally.
• All the roots look like fibers and hence the name fibrous roots.

Answer: Option D

Explanation

The photosynthetic or assimilatory roots are observed in Tinospora. It has no stems and leaves. The roots of these plants become aerial, flattened, ribbon-like and green colored structures. These modified roots absorb moisture from the atmosphere and also synthesize food materials by carbon assimilation.

Answer: Option A

Explanation

Spongy Pneumatophores are found in Jussiaea Mangroves live in marshy and saline soil, so their roots will not get enough oxygen supply for respiration.Also mangroves suffer from lack of oxygen because these soils are water logged. So mangrove plants produce special aerial branches from the roots. These aerial roots possess minute pores which help in the absorption of oxygen from air. These pores are called pneumatothodes and the roots bearing these pores are called pneumatophores. aquatic example is a hydrophyte Jussiaea. Here the aerial roots become spongy and porous. They act as breathing roots apart from helping the plants to float on water. These roots are also known as spongy respiratory root.