Structural Organisation in Animals — BIOLOGY STD 11 Science — Question

Sunday morning Abhishek and his friends emptied all the overhead tanks belonging to flat owners who were not residing in their apartments for the last few months. On their return, the owners complained about their empty tanks. Some elderly people even spoke against Abhishek and his friends. Abhishek humbly apologised for the inconvenience caused. He explained that water in the tanks had become stagnant and become a breeding ground for mosquitoes which will give rise to malaria. The people appreciated the boys.

1. What values are reflected by Abhishek in the above case?
2. What is the causal agent of malaria and how does it reach human body?
3. How many phases the causal organism undergoes in its life cycle?
4. As an individual what can you do to avoid malaria in your neighbourhood?

Differentiate between the following: Apoplast and symplast pathways of movement of water in plants

Explain the following events of a cardiac cycle.

1. Atrial systole.
2. Ventricular systole.
3. Ventricular diastole.

Give a diagrammatic representation of ATP synthesis.

What is hibernation? Describe winter sleep (hibernation).

Write any four differences between mitosis of animal and plant cells.

Why nephridia in earthworm that is basically similar in structure is classified into three types? Mention the names of each.

1. Why are proteins called heteropolymers and not homopolymers?
2. Why are essential amino acids to be taken in our diet?

‘All elements that are present in a plant need not be essential to its survival’. Comment.

With the help of proper diagram describe various regions of root.