(Q.67) Write the basic differences between autotrophic and heterotrophic nutrition.

(Q.67)  Write the basic differences between autotrophic and heterotrophic nutrition.

(Ans) In autotrophic nutrition: Carbon dioxide and water are converted into carbohydrates by green plants in the presence of sunlight.
In heterotrophic nutrition: Other organisms take up the ready-made complex food prepared by green plant.

Name and write the function of the enzyme present in human saliva

(Q.66)  Name and write the function of the enzyme present in human saliva.

(Ans) Salivary amylase. It breaks down starch into sugar.

What is peristaltic movement? How helpful are they in human digestion?

(Q.65)  What is peristaltic movement? How helpful are they in human digestion?

(Ans) The muscles of the food canal contract rhythmically. These movements are peristalsis and these movements push the food forward.

Why do herbivores need a longer intestine and the carnivores the shorter one?

(Q.64)  Why do herbivores need a longer intestine and the carnivores the shorter one?

(Ans) Herbivores need longer intestine, as they need to digest the cellulose of grasses and other plants While carnivorous eat meat which is easier to digest thus they have shorter intestine.

What are the differences between arteries and veins?

(Q.63)  What are the differences between arteries and veins?

(Ans) Arteries have thick and elastic walls; they carry blood away from the heart.
Veins do not have thick walls but have valves to ensure that blood flows in one direction. Veins carry blood towards heart.

Write the methods used by the plants to get rid of excretory products.

(Q.62)  Write the methods used by the plants to get rid of excretory products.

(Ans) Plants get rid of:
1. of water by transpiration.
2. waste products may be stored in vacuoles or may be stored in leaves which fall off.
3. resine and gums are stored in xylem.
4. some waste substance may be excreted in the soil.
5. as by products move out of the plants by diffusion through stomata.

Which of the following factor does not affect the rate of photosynthesis

(Q.61)  Which of the following factor does not affect the rate of photosynthesis?

(A) Light (B) CO2 (C) Water and temperature (D) Wind velocity

Which type of intestine is required by herbivores

(Q.56)  The gastric glands present in the wall of stomach release:

(A) Pepsin (B) Mucus (C) HCl (D) All the above (Q.57)  What is the difference between the walls of arteries and veins?

(A) Arteries have thick and elastic walls but veins do not have thick walls. (B) Veins have thick and elastic walls but arteries do not have thick walls. (C) Both have thin walls. (D) None of the above (Q.58)  Which type of intestine is required by herbivores?

(A) Shorter (B) Longer (C) Circular (D) None of the above (Q.59)  Process of digestion begins from which enzyme?

(A) Salivary amylase (B) Salivary ligase (C) Salivary trypsin (D) None of the above (Q.60)  What is the smallest unit of excretory system in human beings?

(A) Nephrons (B) Neurons (C) Alveolus (D) None of the above

How does plants get rid of excess of water

(Q.51)  What is the full form of ATP?

(A) Adenosine Tetra Phosphate. (B) Adenosine Tri Phosphate. (C) Aminosine Triphosphate (D) Aminosine Tetra Phosphate (Q.52)  Rate of respiration in aquatic organisms is ____as compared to terrestrial organisms.

(A) Low (B) Fast (C) Equal (D) Cannot say (Q.53)  Which of the following factors affect the rate of photosynthesis?

(A) Light (B) CO2 (C) Water and temperature (D) All the above (Q.54)  How does plants get rid of excess of water?

(A) Store it in leaves (B) Store it in vacuoles (C) Releases through roots (D) By transpiration (Q.55)  How does the transportation of food take place in plants?

(A) Transportation of food takes place in plants through xylem. (B) Transportation of food takes place in plants through phloem. (C) Transportation of food takes place in plants through xylem and phloem. (D) None of them

What is the function of mucus secreted in the stomach

(Q.46)  Arrange the following events in sequence that take place in the process of photosynthesis. (a) Conversion of light energy into chemical energy and splitting of water molecules into hydrogen and oxygen. (b) Reduction of carbon dioxide to carbohydrates. (c) Absorption of light energy by chlorophyll.

(A) (a)à (b)à (c) (B) (b)à (c)à (a) (C) (a)à (c)à (b) (D) (c)à (a)à (b) (Q.47)  What are the values of normal systolic and diastolic pressures in the human body?

(A) 120 mm and 80 mm of Hg respectively (B) 80 mm and 120 mm of Hg respectively (C) 70 mm and 110 mm of Hg respectively (D) 110 mm and 70 mm of Hg respectively (Q.48)  What is the function of mucus secreted in the stomach?

(A) Helps in protein digestion (B) Activates the enzyme pepsin (C) Kills the bacteria of stomach (D) Protects the lining of stomach (Q.49)  Tick the correct statement.

(A) Arteries carry blood away from the heart while veins carry blood towards heart. (B) Veins carry blood away from the heart while arteries carry blood towards heart. (C) Both of them carry blood in the same direction. (D) Either of them can carry blood away from the blood. (Q.50)  How does amoeba takes food?

(A) By using tentacles. (B) By using flagella. (C) By using pseudopodia. (D) None of the above.