Q32 of 65 Page 230

In order for quick harvest, a farmer added product A in the field. Later, the effects of another product were observed, i.e. writing of leaves and dormancy in seeds. Read the above passage and answer the following questions.

(i) What is the name of product A? List its two functions.


(ii) Can you guess what was applied instead of product A? what is its mode of action?


(iii) Can you suggest two naturally occurring plant hormones and their actions?


(iv) What values should be present in agricultural practitioners?

(i) Abscisic acid is product A. Its functions are cell division (in fruits and seeds) and breaking of seed dormancy.

(ii) Abscisic acid. It inhibits the growth.


(iii) Auxin – elongation of cells and promotes the growth of seedless fruits.


Gibberellins – stem growth, seed germination and flowering.


(iv) Values like honesty and responsibility should be present in agricultural practitioners.


More from this chapter

All 65 →
30

Ramesh a class X student, goes with his mother to bring milk from a nearby dairy farm. On a number of occasions, he had seen the dairy owner giving an injection to the buffalo before milking. Ramesh being concerned discussed with the dairy owner, about the harmful effects of such practice. Read the above passage and answer the following questions.

(i) Which chemical was being injected by dairy owner in buffalo before milking it and why?


(ii) What other major functions this chemical performs in buffalo or adult human females? Also, list two common terms used for the chemical based on its functions.


(iii) Why should such practice be discouraged? Comment.


(iv) What values were shown by Ramesh?

 31

Recently. The science teacher discussed with students ‘Control and Coordination in Animals’. He told children that two systems, i.e. the nervous system and endocrine system help to regulate all body functions. He also told becoming addict to alcohol drinking and how alcohol is affecting their body.

Read the above passage and answer the following questions.


(i) Which hormones are responsible for the onset of adolescence


(ii) How does alcohol drinking affect the nervous system?


(iii) What role the government should play to check alcohol drinking especially by adolescents? Give at least two suggestions.


(iv) What values were shown by the teacher?

 1

The given diagrams shown some of the features of human skin.


Which part of the brain coordinates the information labeled in the diagram?

 2

The diagram shows the central nervous system, which has been blocked in three different places by a drug used as an anaesthetic.


Three men had one unaesthetic block at X,Y or A. One of the men can move his leg in response to a pinprick, but does not feel it. Where is the anesthetic block in this man?