Plant Growth and Development — BIOLOGY STD 11 Science — Question

While examining the mitotic stage in a tissue. One finds some cells with 16 chromosomes and some with 32 chromosomes. What possible reasons could you assign to this difference in chromosome number? Do you think that cells with 16 chromosomes number could have arisen from cells with 32 chromosomes or vice-versa?

What is acute infection or inflammation of the alveoli?

Name two synthetic auxins.​​​​​​​

While using hydroponics why aeration of nutrient solution is important?

What is pericarp? Name its three different regions in a fleshy fruit.

Name two groups of animals where exchange of gases occurs by diffusion across their entire body surface.

Which gibberellin was discovered first?

Which type of neurons are found in the,

1. Dorsal root of a spinal nerve?
2. Ventral root of a spinal nerve?

Name the double-wailed sac, which covers the lung in mammals.

Correct the wrong statements among the following: Typhlosole is the part of intestine of earthworm.