Daily NEET MCQ- April 13, 2022 - NEET MCQ

Escape velocity (v) = (2*g*R)^1/2
g = Acceleration due to gravity
R = Radius of planet
Given;
R_a/R_b = r
g_a/g_b = p
v_a/v_b = (2*g_a*R_a])^1/2/(2*g_b*R_b) ^1/2
= (p x r)^1/2.

As per the notations of the IUPAC nomenclature, the 101st element is named as Unnilunium. When the Einstenium was bombarded with alpha particles, Mendelevium was discovered and named after Dmitri Mendeleev.

As per IUPAC nomenclature, 0 – nil, 1 – un, 2 – bi, 3 – tri, 4 – quad, 5 – pent, 6 – hex, 7 – sept, 8 – oct and 9 – enn. Here it’s 109 so 1 – un, 0 – nil and 9 – enn, combining them its unnilennium (adding “-ium” after it).

Unnilquadium is a combination of un, nil, and quad i.e. 1, 0 and 4 as per IUPAC nomenclature. Its symbol is formed by joining the first letters. So combining u from uni, n from nil and q from quad, we get Unq.

Prop roots are those that originate from aerial branches. Prop roots are also called hanging roots. Those roots that originate from stem base that grow obliquely and penetrate into the soil are called stilt roots. Stilt roots are present in sugar cane and maize.

In trapa, roots help in performing photosynthesis. In few aquatic plants, roots are modified into spongy structure help in floating by maintaining buoyancy. In parasitic plants, haustorial roots penetrate into host to derive nutrition. Haustorial roots are present in cuscuta.

Root system helps in absorption of water and minerals from soil. In plants like mangroves, breathing roots called pneumatophores are present. Pneumatophores grow vertically upwards and exchange gases through lenticels. Plants that grow tall derive their additional mechanical support by sending pillar like woody roots called prop roots.

Banyan roots have adventitious roots called prop roots that provide them with additional support. Prop roots are also called as hanging roots. Prop roots on meeting the soil form secondary and tertiary roots. Initially these start as tiny outgrowth on the branches and become woody and large.

Climbing roots originate from nodes or internodes. They help plant climb on the surface. These roots secrete sticky substances that help the plants to stick on the walls. Climbing roots don’t help in anchoring the plant to the soil.

Clarification: If the object’s initial velocity is “v”, from the law of conservation of energy, we have;
(m x v²)/2 = (G x M x m)/R
v² = (2 x G x M)/R
Therefore; v = [(2 x G x M)/R]^1/2.