Direction : Study the following question carefully and choose the right answer.
1
What is considered as a normal blood pressure In humans?
» Explain it
B
Blood pressure (BP) is the pressure of circulating blood on the walls of blood vessels. It is measured by an instrument named sphygmomamometer.  120/80 mm hg is considered to be normal blood pressure.

Hence, option B is correct.
 
2
Which of the following does not show heterotrophic nutrition?
» Explain it
D
There are two modes of nutrition in living beings.

Autotrophic nutrition- Autotrophic nutrition means that simple inorganic substances are taken in and used to synthesise organic molecules. Energy is needed to achieve this. Plants are examples of autotrophic nutrition since they make food with the help of sunlight, nitrogen, water and other nutrients from the environment.

Heterotrophic nutrition- Heterotrophic nutrition is the mode of nutrition in which organisms depend upon other organisms to survive. All animals and non green plants are heterotrophic. Heterotrophic organisms have to acquire and take in all the organic substances they need to survive.

Except green plants, all other options are heterotrophic.

Hence, option D is correct.
 
3
Which of the following is the name of a protein digesting enzyme present in the stomach?
» Explain it
B
Pepsin is a protein digesting enzyme present in the stomach. Enzymes called pepsin and trypsin digest dietary proteins. Another hydrolase called lipase is secreted by your pancreas and helps break down dietary fats. The enzyme amylase stimulates the digestion of dietary starch.

Hence, option B is correct.
 
4
Which of the following is a plant hormone?
» Explain it
D
Insulin, thyroxin ad oestrogen are all animal hormones. Insulin is secreted by pancreas which helps In maintaining the sugar levels in a human body. Thyroxin is secreted by the thyroid gland situated in the neck. Oestrogen is the primary female sex hormone. It is responsible for the development and regulation of the female reproductive system and secondary sex characteristics.

Cytokinin is a plant hormone. Cytokinins are a class of plant growth substances (phytohormones) that promote cell division, or cytokinesis, in plant roots and shoots.

Hence, option D is correct.
 
5
The gap between two neurons is called a
» Explain it
B
The gap between two neurons is called synapse. Below is a labelled picture of a neuron.
 

Hence, option B is correct.