Assignment no.15 for 9th

Assignment no.15 for 9th 
Q 1   What are three group of activities done to improve food production from plants ?
Q 2   Enumerate some aims and objectives of varietal improvement .
HOTS
Q1  Explain the methods of varietal improvement.

Assignment no 17 for class 10th

Assignment no 17 for class 10th 

Q1 Why is pitutary called master gland ?

Q2 Write the hormones released by the following glands and explain their function:

(a)Thyroid

(b) Pancreas

(c) Adrenal

(d) ovary 

(e) testes

Q3 Why do people living in hilly areas suffer more from goiter?

Q4 Which glands are called mixed glands and why?

Q5 Differentiate between endocrine and exocrine glands with example and reason?

HOTS  

Q1 Why do we feel sweating and lack of appetite when there is any emergency ? 

Q2 which  gland is a two in one gland ? mention it's endocrine role?

Q3 Explain feed back mechanism with the help of suitable example.

Assignment no 14 for 9th

Assignment no 14 for 9th 
Q1 Draw labelled diagram of the three types of muscle tissue .
q2 differentiate the three type of muscle tissue on the basis of:
(a) location 
(b) nucleus 
(c) bands
(d) branching
(e) function
Q3 Explain the function o9f nerve cell along with it's diagram.

HOTS 
Q1 why do body builders consume high protein diet and perform exercises regularly?
Q2 Why are  nerve cells  so long?

Assignment 16 for class 10th

Assignment 16 for class 10th
Q1 Give the definition and example of the following
(a)Geotropism
(b)Phototropsm
(c)Thigmotropism
(d) Hydrotropism
(e) Chemotropism
Q2 Diffentiate between the following
(a) Tropic movement and nastic movement
(b) positive and negative phototropism
Q3 Explain the phenomenon of bending of stem towards light
Q4 Write two functions
(a) Auxin
(b) cytokinin
(c) Gibberellins
(d) Abscisic acid
HOTS
Q1 Why is abscisic acid called growth inhibitor?
Q2 Why do gardners are seen pruning the plants frequently?
Q3 Why should we cut the tip of stalk of fruit before eating the rest ?

Assignment 13 for 9th

Assignment 13 for 9th
Q 1 Write the following names:
Epithelial tissue present in 
(a) Skin
(b) cheek 
(c) kidney
(d) Small intestine
(e) Trachea
(f) blood vessels
Q2 List any four functions of epithelial tissue?
Q3 Differentiate between 
(a)ligament and tendon
(b)Bone and cartilage
Q4 Name the components of blood and list their functions.

HOTS
Q1 Why do some animals like polar bear have very thick layer of adipose tissue?
Q2 What is the significance of having areolar tissue in between the body parts and organs?
Q3Why do red blood cells don't have nucleus and where are they synthesized?
(hint -in bone marrow and they need more space to carry oxygen)

All the 9th and 10th class students are instructed to submit their complete holidays' home work within this week or face the consequences.

Assignment 12 for 9th class

Assignment 12 for 9th class 
Q1 what are the components of xylem and phloem .
Q2 Draw the diagram of vessel , tracheid and phloem tissue.
Q3 Write the function the following:
(a)vessel
(b)Xylem parenchyma
(c) companion cells
HOTS  
Q1 compare the two conducting tissue i.e xylem and phloem.
Q2 Why are vascular tissue called complex permanent tissue?

Assignment 15 for class 10th 
Q1 Draw labelled diagram of human brain.
Q2 Write the functions of the following:
(a) Forebrain
(b) hind brain
(c) cranium

HOTS
Q1 What the function of meninges?
Q2 What is the significance of having several folds in the cerebrum?
Q3 Which part is called brain stem and what role does it play?