Question

Assertion: living organisms show internal as well as external growth.
Reason: living organisms undergo the process known as accretion.
A. Both assertion and reason are correct and reason is the correct explanation for assertion
B. Both assertion and reason are correct but reason is not the correct explanation for assertion
C. Assertion is correct but reason is incorrect
D. Both assertion and reason are incorrect

Answer 1

However, growth in living things is caused by a variety of internal processes that take place within the bodies of living organisms, the most important of which is the development of new cells. Growth has two distinct characteristics: an increase in the number and mass of individuals. Cell division is how multicellular creatures grow. As multicellular organisms grow, they add additional cells to develop additional tissues and organs.

Complete answer:
Option A: Internal growth happens in living organisms as a result of the body's synthesis of new cells. This operation is referred to as intussusception. Non-living things grow when similar materials are applied to their outside surfaces. The process is referred to as accretion.
So, option A is incorrect.
Option B: Internal growth occurs as a result of the body's production of new cells in living organisms. Intussusception is the medical term for this procedure. When similar materials are put to the exterior surfaces of non-living creatures, they grow. The procedure is known as accretion.
So, option B is not correct.
Option C: Growth is defined as an increase in the number of people in a group. External growth refers to growth that occurs as a result of events outside of their control, resulting in a rise in their population.
So, option C is not correct.
Option D: Internal growth occurs in living organisms as a result of the creation of cells within the body. Intussusception is a term for this type of procedure. The addition of comparable materials to the outer surface of non-living things causes them to grow. The procedure is known as accretion.
So, option D is correct

Therefore, Option D is the correct answer.

Note:
Primary and secondary growth: Mitotic divisions in meristematic cells at the root and shoot apex lengthen the plant. This is known as Primary Growth, whereas Secondary Growth refers to the increased width of the plant caused by the secondary meristem.
Vegetative Growth: Vegetative growth refers to the growth of plants prior to flowering, which includes the creation of leaves, branches, and stems.
Reproductive Growth: The plants begin to blossom, which is a reproductive member of the plant, during this stage.