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Questions in biology

[Homework Help] When Mendel crossed two purple-flowered pea plants with each other, he obtained a phenotypic ratio of 3:1 (purple-flowered pea plants to white-flowered pea plants). His results are consistent with which of the following sets of parents? A. Homozygous dominant purple pea plant and heterozygous white pea plant B. Heterozygous purple pea plant and homozygous dominant purple pea plant C. Homozygous dominant purple pea plant and homozygous recessive white pea plant D. Heterozygous purple pea plant and heterozygous purple pea plant

[Homework Help] Assertion (A): For sowing, seeds are scattered by seed drill. Reason (R): Sowing of seeds is done before preparation of soil.

[Homework Help] Which gases are carried by red blood cells? Select two options. A. oxygen B. helium C. carbon dioxide D. nitrogen E. hydrogen

[Homework Help] B. Fill in the blanks. 1. Living things get _______ from the food they eat. 2. Plants breathe through _______. 3. Whales breathe through their _______ gas. 4. Plants prepare food with the help of _______. 5. _______ and _______ give shape to a tree. 6. The single main root called _______ bears several small roots. 7. We can avoid _______ following safety rules at various places. 8. We should use a _______ to cross the road.

[Homework Help] 1. Which part of the tooth is visible when we open our mouth? 2. How many molars are there in each jaw? 3. What is the yellow sticky layer present on teeth called? Plaque 4. Which type of teeth are used for grinding?

[Homework Help] Based on the information shown in the table, match each digestive enzyme to the part of the body where it is found. | mouth | stomach | small intestine | |---|---|---| | | |

[Homework Help] Most plants are A. monocots B. dicots C. tricots D. polycots

[Homework Help] A person who has allergies has a compromised immune system because the body's immune system A. attacks its healthy cells. B. overreacts to an antigen. C. steals nutrients from healthy cells. D. responds to mutagens.

[Homework Help] Which conditions need to be in balance for cells to function? Check all that apply. A. blood sugar B. food intake C. body water D. body temperature E. body mass

[Homework Help] Which of the following is not an example of mechanical control of nonnative species? A. pulling B. inspections C. net barriers D. mowing