Animal Kingdom — BIOLOGY STD 11 Science — Question

The transport of substances through phloem happens in two directions, i.e. from source to sink and from sink to source. This is similar to a dialogue between two persons because of which of the following? What are the benefits of two-way communication for us?

1. The flow of message happens in from speaker to the listener.
2. The flow of message happens in two directions; in a dialogue.
3. The flow of message needs a medium.

Write short notes on following:

1. Diploblastic and Triploblastic Organization.
2. Different types of coelom.
3. Segmentation.
4. Notochord.

Which are the different phases of growth in a plant? Describe with the help of suitable diagrams.

Nucleic acids exhibit secondary structure. Describe through WetsonCrick Model.

What is hemodialysis (blood dialysis)? Describe its process.

Create an annotated diagram of the vertebral column in humans and describe its four functions.

What are the steps involved in formation of a root nodule?

Vidhi attended the guest lecture on photosynthesis with her biology teacher. Guest for the seminar explained the basic functioning of chloroplast in the photosynthetic processes. As students from different schools attended the seminar. The guest for the lecture asked all students to put forward their queries regarding the topic. Vidhi stood up and asked him that, she is unable to understand the division of labour in the chloroplast. He appreciated her doubts and explained her about the same.

1. What do you understand by the division of labour in chloroplast?
2. How the different pigments are involved in photosynthesis?
3. What is the significance of photosynthesis for animals?
4. Elucide the value shown by Vidhi as a good biology student?

Frog is a poikilotherm, exhibits camouflage and undergoes aestivation and hibernation, how are all these beneficial to it?

Give a brief account of mechanism of vision.