PART - 2 - Unit V : CH - 16 Excretory Products and Their Elimination — BIOLOGY STD 11 Science — Question

Represent diagrammatically the mechanism of translocation of organic nutrients through phloem.

Mango and coconut are ‘drupe’ type of fruits. In mango fleshy mesocarp is edible. What is the edible part of coconut? What does milk of tender coconut represent?

Describe briefly the four major groups of Protozoa.

How was three kingdom system different than four kingdom system?

Differentiate between right ventricle and left ventricle.

You have heard about several insectivorous plants that feed on insects. Nepenthes or the pitcher plant is one such example, which usually grows in shallow water or in marsh lands. What part of the plant is modified into a ‘pitcher’? How does this modification help the plant for food even though it can photosynthesize like any other green plant?

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?

What is the significance of the time gap in the passage of action potential from the sinoatrial node to the ventricle?

List the various types of nephridia in earthworm. Briefly describe the functioning of nephridia during excretion.

1. What is termed as first messenger and second messenger in the target cells.
2. How do protein hormones act on target cells?