PART - 1 - Unit I : CH - 4 Animal Kingdom — BIOLOGY STD 11 Science — Question

Arya went to a bird sanctuary with her family. She saw numerous birds there and was amazed by the colourful and vibrant world of flying birds. She also saw ostriches there but they were not flying seeing this, she asked her mother who is an ornithologist) why only birds can fly, while all other animals cannot. She also asked her mother about the birds that cannot fly.

Her mother explained Arya about birds and their characteristic features. Arya felt happy knowing knowledge:

1. Which characteristic features of Aves.
2. What are the flight adaptations of birds?
3. Name few flightless birds.
4. What values are shown by Arya?

List any six features of cartilaginous fishes. Give four examples of these.

Write the names of the products formed on incomplete oxidation of glucose molecule and write any four importance of respiration.

(i) Renin hormone is secreted by which cells? Write one function of it.
(ii) Make a labelled diagram of the longitudinal section of the kidney.

Give a description of the structure of neuron.

Neha while learning for her test, got confused how aerobic pyruvic acid is transported to mitochondria for further oxidation. She asked her elder sister (who is a graduate in biology) about this and also asked her to explain the same process in detail. Her sister explained her that it gets completely oxidised into CO₂ and water along with the formation of ATP.

1. Mention the sites in the mitochondria, where these events occur.
2. What happens to pyruvic acid before it enters 'Krebs' cycle?
3. Write the summary equation for the 'Krebs' cycle.
4. Mention the value implicit through Neha's character.

Classify bones on the basis of texture.

Vicky's mother was very concerned about his son. She always used to give him advices on how he should study, what is good for his health, and about everything. One day Vicky saw some, birds flying independently and asked his mother that why don't animals take care of their young ones like humans. Her mother smiled and explained that parental care is also well-developed in some animals.

1. Explain parental care in mammals.
2. Which other animals show parental care and how?
3. What does parental care indicate? bine
4. What values are shown by Vickey's mother?

An Rh-negative woman is carrying an Rh-positive foetus for the second time. Describe the consequences of Rh-incompatibility in this case?

OR

Why is it necessary to check the Rh-factor of the blood of a pregnant woman?