Which kingdom is characterized by the presence of a rigid cell wall and the formation of an embryo?

Viruses have

Two particles of masses $m_1$ and $m_2$ in projectile motion have velocities $\vec{v}_1$ and $\vec{v}_2$ respectively at time $t = 0$. They collide at time $t_0$. Their velocities become $\vec{v}_1'$ and $\vec{v}_2'$ at time $2t_0$ while still moving in air. The value of $|(m_1 \vec{v}_1' + m_2 \vec{v}_2') - (m_1 \vec{v}_1 + m_2 \vec{v}_2)|$ is

Which of the following is an example of a new crop?

Which of the following is a disaccharide?

When a piece of bread is chewed,it tastes sweet because: