Biology Questions

Plants grow in size both in height and in girth. Enlargement of cells already present cannnot contribute much to the growth. Only addition of more and more cells could increase the size of the plant considerably.

We know that, when we eat a meal, any carbohydrates we've eaten are broken down into glucose and passed into the bloodstream. This rise in blood glucose causes insulin to be released from the pancreas so glucose can move inside the cells and be used. As glucose moves inside the cells, the amount of glucose in the bloodstream returns to normal and insulin release slows down.

Mitochondria is absent in Bacteria as well as in Blue Green Algae. They are seen in eukaryotic cells for respiration purpose.

Sugar is a component of Carbohydrates.

"If fertilization occurs, the corpus luteum is maintained by a hormone secreted by the developing embryo." is the only correct statement about the uterine cycle among the options.

DNA is made of nucleotides. And these Nucleotides are made of a pentose sugar deoxyribose, a phosphate, and a nitrogen-containing bases.

Hence, the given statement 'Nucleotides are made of a pentose only' is FALSE.

The brain has three main parts the cerebrum, cerebellum and brainstem. As cerebrum is the largest part of the brain it is divided into two hemispheres i.e, right and left. It performs many functions like vision, hearing, touch, learning, consciousness, emotions, etc...

Every ecosystem must have Autotrophs.