Plant Kingdom — BIOLOGY STD 11 Science — Question

Mention two conditions which allow the root pressure to occur.

Rani was amazed to read about the layers and coverings in the plant. As her teacher taught her that like mammals, plants are also formed by various layers of tissues. Thus, forming the different plant system. As the epidermal tissue system forms the outermost covering of the body. She felt curious and asked her elder sister about the same, that how come this is possible. Her sister cleared all her doubts patiently.

1. From where it is derived?
2. Why are outer wall of some plants is cutinised?
3. In some cases, the cuticle is reinforced by a layer of wax. Explain the reason.
4. Extract the message from Rani's behavior.

In the diagrammatic presentation of heart given below, mark and label, SAN, AVN, AV bundles, bundle of His and Purkinje fibres.

In normal breathing, which is the active process inspiration or expiration Explain.

What is the characteristic feature of class-Ascomycetes?

The technique of solution culture has been developed to avoid contamination. Justify. How?

Solenocytes and metanephridia are excretory organs of:

1. Coelenterata and Mollusca.
2. Platyhelminthes and Annelida.
3. Aschelminthes and Annelida.
4. Annelida and Arthropoda.

Which tissue is afflicted by Myasthenia gravis? What is the underlying cause?

Name and describe the experiment that was used to identify the tissues through which food is transported.