What are the components of pancreatic juice, where are aged erythrocytes destroyed, and what deficiency causes thin lanky growth in seedlings?

Here are the solutions to the questions:

31. The pancreatic juice contains the enzymes amylopsin, Steapsin and trypsinogen.

• Pancreatic juice contains a variety of digestive enzymes. Amylopsin is pancreatic amylase, which digests carbohydrates. Steapsin is pancreatic lipase, which digests fats. Trypsinogen is a precursor to trypsin, a protease that digests proteins. The correct option is A. The pancreatic juice contains the enzymes $\boxed{\text{A. Steapsin and trypsinogen}}$.

32. Aged erythrocytes are destroyed in the

• Aged or damaged red blood cells (erythrocytes) are primarily removed from circulation and broken down by macrophages in the spleen and liver. The correct option is B. Aged erythrocytes are destroyed in the $\boxed{\text{B. Liver}}$.

33. The seedling in a rice field were found to have thin lanky growth with reddish leaves and poor root development. This is because the soil lacks

• These symptoms—thin lanky growth, reddish or purplish leaves, and poor root development—are characteristic signs of phosphorus deficiency in plants. Phosphorus is essential for energy transfer, root growth, and overall plant development. The correct option is B. This is because the soil lacks $\boxed{\text{B. Phosphorus}}$.

34. There will be agglutination when the

• Agglutination (clumping of red blood cells) occurs when antibodies in the serum react with corresponding antigens on the surface of red blood cells.
  • Blood Group A serum contains anti-B antibodies.
  • Blood Group B erythrocytes have B antigens.
• Therefore, when Group A serum mixes with Group B erythrocytes, the anti-B antibodies in the serum will react with the B antigens on the erythrocytes, causing agglutination. The correct option is B. There will be agglutination when $\boxed{\text{B. Group A serum mixes with Group B erythrocytes}}$.

35. Which of the following is the function of lymph?

• Lymph is formed from interstitial fluid, which is the fluid surrounding cells. This fluid facilitates the exchange of substances between blood capillaries and cells. Therefore, lymph (as interstitial fluid) is involved in the transport of nutrients and oxygen from the blood capillaries to the cells, and also carries away waste products. Other key functions of lymph include returning excess fluid to the bloodstream, transporting absorbed fats, and playing a crucial role in the immune system. The correct option is C. The function of lymph is $\boxed{\text{C. Transports nutrients and oxygen from blood capillaries to the cells}}$.

36. Which of the following organisms is a vector for malaria?

• Malaria is a parasitic disease transmitted to humans through the bite of infected female Anopheles mosquitoes. The correct option is A. The organism that is a vector for malaria is $\boxed{\text{A. Mosquito}}$.