30. Explain how fertilizers are different from manure?
31. Write a short notes on the harmful effects of microorganisms?
32. Cells are the structural and functional unit of loving organisms. Explain?
33. What is metamorphosis? Give two examples.
34. Differentiate between internal fertilisation and external fertilisation
35. What is menstruation? Explain.
36. Is it safe for the electrician to carry out electrical repairs outdoors during heavy dow
Explain.
37. What is Adam's apple?
38. What are weeds ? How can we control them?
Answers
30) Manures are obtained or prepared from natural sources like kitchen waste, vermicompost, human waste, and by decomposing the biodegradable materials. Manures are environment-friendly and are produced at a low cost. It is cost economical to farmers.
Manures are obtained or prepared from natural sources like kitchen waste, vermicompost, human waste, and by decomposing the biodegradable materials. Manures are environment-friendly and are produced at a low cost. It is cost economical to farmers.The fertilizers are synthetically and chemically manufactured in the factories and industries. Fertilizers harm the microbes present in the soil which help in nitrogen fixation and other important microbes that are useful to crop. It also decreases the soil fertility if it is prolonged and used for a longer duration. It is not cost economical for farmers.
31) Microorganisms can prove very harmful to us, as they cause a number of diseases in human, plants and animals. Diseases in humans like common cold, tuberculosis, measles, chicken pox, polio, cholera, typhoid, hepatitis B, malaria, etc. are caused by microorganisms.
32) The cell is called the structural and functional unit of life as all living organisms are made up of cells. Cells are also essential for performing various life processes required for sustaining life. Furthermore, cells provide form and structure, process nutrients and convert it into useable energy.
33) Metamorphosis is a biological process which involves sudden and abrupt changes in the body structure of the animal by cell growth and differentiation. It is generally observed in amphibians and insects. Examples: frogs and butterflies.
34) Internal fertilization is the process when the syngamy (union of male and female gamete) occurs inside the female body after insemination using copulation. In contrast, External fertilization is the syngamy outside the female body, that is in the outer environment especially in water bodies.
35) Menstruation, or period, is normal vaginal bleeding that occurs as part of a woman's monthly cycle. Every month, your body prepares for pregnancy. If no pregnancy occurs, the uterus, or womb, sheds its lining. The menstrual blood is partly blood and partly tissue from inside the uterus.
36) No, it is not safe for the electrician to carry out electrical repairs outdoors during heavy downpour. As rainwater consists of dissolved salts, it can conduct electricity.
37) When the larynx grows larger during puberty, it sticks out at the front of the throat. This is what's called an Adam's apple. ... An Adam's apple sometimes looks like a small, rounded apple just under the skin in the front of the throat. This larger larynx also gives boys deeper voices.
38) Tilling before sowing of crops helps in the uprooting and killing of weeds. Which may dry up and get mixed with soil. Weeds are also controlled by using certain chemicals, called weedicides. Weedicides are sprayed in the fields to kill the weeds.
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