Explanation

Racing cars have really low centers of gravity so that they can corner rapidly without turning over. 

Explanation

HF has the highest ionic character

because electronegativity difference between H and F is highest.

ionic character follows the order HF >HCl>HBr> HI.

As the electronegativity difference increases ionic character increases.

Explanation

Dermatogen is the primary meristem that forms the outermost layer of a plant and forms the epidermis

Periblem is a primary meristem that is located between the plerome and the dermatogen and it forms the cortex

Plerome is the primary meristem that forms the central core of a plant 

Explanation

Weight(mg) of a block = 20N

Height (h) = 6m

Now, potential energy(PE) = mgh

=20 × 6

= 120Joules

The potential energy stored in it is 120 joules.

Explanation

Mass 1,  = 1000 kg

Mass 2,  = 1000 kg

Distance between the spheres, r = 0.5 meters

Gravitational force is the force of attraction between two bodies.

The force of gravitation is inversely proportional to the square of the distance between the bodies and directly proportional to the multiplication of masses of two bodies.

It is given as:

F= G (m1.m2/r^2)

F = 6.67 *n10^11 (1000 * 1000/ 0.5 * 0.5)

F = 2. 67 * 10^-4 N

Explanation

The lingual vein is formed by the sublingual, deep lingual, and dorsal lingual veins

The lingual vein begins on the dorsal side and under the surface of the tongue.  

Explanation

The tapetum is a layer of nutritive cells found within the sporangium, particularly within the anther, of flowering plants.

It has the ability to provide nourishment for the developing embryo as well as release enzymes and hormones.

Tapetum is important for the development of pollen grains.

Explanation

In facilitated transport, also called facilitated diffusion,

material moves across the plasma membrane with the assistance of transmembrane proteins down a concentration gradient (from high to low concentration) without the expenditure of cellular energy.

Explanation

In Riccia sporophyte is embedded.

The spores are formed inside the sporophyte.

The spores are dispersed by the decay of surrounding thallus tissue.

The spore is the first cell of gametophytic

Explanation

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ND19-3-2023