Question

Boron in green plants assists in
(a) Sugar transport
(b) Activation of enzymes
(c) Acting as enzyme cofactor
(d) Photosynthesis

Answer 1

Hint: Boron is important for the expansion of higher plants. The first function of the element is to supply structural integrity to the cell wall in plants. Other functions likely include the upkeep of the cell membrane and other metabolic pathways.

Complete answer:
Boron has an essential role in the development of plants. It has a diverse range of plant functions, which includes-
- Cell wall formation and stability
- Maintenance of structural and functional integrity of the biological membrane
- Movement of sugar into growing parts of plants
- Pollination and seed set
Many of these listed functions could also be embodied by its function in moving the highly polar sugars through cell membranes by reducing their polarity and hence the energy needed to pass the sugar. If sugar is not able to pass to the instance of the fastest- growing part enough, those parts die.
The process of photosynthesis by green parts of the plant converts sunlight into energy and forms sugars. But it's also essential that these sugars should be translocated to other parts of the plant. The speed of sugar transport is increased by boron in growing regions and developing fruits.
So, the right answer is ‘Sugar transport’.

Note:
- Plants contain boron both during a water- soluble and insoluble form. Boron is required in very small quantities. Excess boron may result in boron toxicity. Low boron levels cause poor growth of fast-growing tissues and plant development.
- Boron deficiency affects the vegetative and reproductive growth of plants, resulting in inhibition of cell expansion, death of meristem, and reduced fertility. 
- Plants contain boron both in a water-soluble and insoluble form. The primary function of the element is to provide structural integrity to the cell wall in plants.