Daily NEET MCQ- April 27, 2022 - NEET MCQ

Since the object has mass, it always has inertia. However, weight force is zero and hence the experienced acceleration is zero because it is experiencing weightlessness.

The parabolic trajectory of the free fall of the international space station is at such high velocity that it essentially orbits the planet. The weightlessness experienced by the astronauts in the ISS is the consequence of this freefall.

As per the outer shell configuration of hydrogen (that is 1s1), it has only one electron in s-orbital making it eligible as an Alkali metal. It requires only 1 electron to obtain a noble gas configuration, which is a characteristic of halogen.

The p-block elements comprise of elements from group-13 to group-18 while s-block elements are 1st and 2nd groups. They two together form “Representative elements” or “Main group elements”.

Non-metallic nature is defined as a tendency to gain electrons thus having high negative electron gain enthalpies, but the 18th group has no reactivity. So the non-metallic nature increases from left to right in groups leaving noble gases.

Pheretima or earthworm possesses 4 testes, that is, two pairs. They are present in the 10th and 11th segment. The earthworm is hermaphrodite. Hence, it also possesses female reproductive structures.

Vasa deferentia is the common prostate and sperm duct of earthworms. Vasa efferentia is absent. Spermathecae store spermatozoa during copulation. Oviduct is a part of the female reproductive system.

The spermathecae stores spermatozoa during mating. Four pairs of spermathecae are present in earthworms. They occur in segments 6 to 9. It is not an accessory organ. It is not a vestigial organ.

The earthworm possesses one pair, that is, two ovaries. They are attached at the septum between the 12th and 13th segments. Egg cells or ova are formed which subsequently get fertilized to zygotes during fertilization.

In the body of earthworms, the ovarian funnels are present below the ovaries. The ovarian funnels open up into the oviduct and join together. They lead to an opening on the ventral side known as the female genital pore.