Q19 of 30 Page 1

(a) State the role played by the following in the process of digestion.

(i) Enzyme trypsin


(ii) Enzyme lipase


(b) List two functions of finger like projections present in the small intestine.


(a) Enzyme Trypsin: The pancreas secretes pancreatic juice which contains enzymes like trypsin for digesting proteins

Enzyme Lipase: The pancreas secretes pancreatic juice which contains enzymes like lipase for breaking down emulsified fats.


(b) The lining of the small intestine is covered with tiny finger-like projections called villi. The villi help the nutrients in food to be absorbed into the blood. The villi are carpet-like fingers inside the small intestine that help absorb nutrients.


More from this chapter

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17

Study the data of the following three categories A, B
and C.




(i) From the given three categories A, B and C, pick the one which forms Dobereiner Triads.


(ii) Why did Mendeleev laced elements of category A, B and C in three different groups?


(iii) Is Newland law of octaves applicable to all the three categories? Give reason to justify your answer.


 18

(a) From the following group of organisms create a food chain which is the most advantageous for Human being in terms of energy.

Hawk, Rat, Cereal plant, Goat, Snake, Human Being


(b) State the possible disadvantage if the cereal is growing in soil rich in pesticides.


(c) Construct a food web using the organisms mentioned above.


OR


(a) Write two harmful effects of using plastic bags on the environment. Suggest alternatives to the usage of plastic bags.


(b) List any two practices that can be followed to dispose off the waste produced in our homes.


 20

(a) Classify the following as homologous or analogous pairs:

(i) Broccoli and cabbage


(ii) Ginger and Raddish


(iii) Fore limbs or birds and lizard


(iv) Wings of a bat and wings of a bird


(b) State the main feature that categorises a given pair of organs as homologous and analogous.


 21

A green stemmed rose plant denoted by GG and a brown stemmed rose plant denoted by gg are allowed to undergo a cross with each other.

(a) List your observation regarding


(i) Colour of stem in their F1 progeny


(ii) Percentage of brown stemmed plants in F2 progeny if F1 plants are self-pollinated.


(iii) Ratio of GG and Gg in the F2 progeny.


(b) Based on the findings of this cross, what conclusion can be drawn?