4exam

Q.1: Make a comparison to write down ways in which plant cells are different from animal cells. Ans: The cells of animals and plants have the following differences: Animal Cell >> Animal cells are generally small in size. >> Cell wall is absent. >> Except the protozoan Euglena, no animal cell possesses plastids. >> Vacuoles in animal cells are many, small and temporary. >> Animal cells have a single highly complex and prominent Golgi apparatus. >> Animal cells have centrosome and centrioles. Plant Cell >> Plant cells are larger than animal cells. >> The plasma membrane of plant cells is surrounded by a rigid cell wall of cellulose. >> Plastids are present. >> Most mature plant cells have a permanent and large central sap vacuole. >> Plant cells have many simpler units of Golgi apparatus, called dictyosomes. >> Plant cells lack centrosome and centrioles. Q.2: How is a prokaryotic

Adult education is the practice of teaching and educating adults. This often happens in the workplace, through 'extension' or 'continuing education' courses at secondary schools, at a college or university. Other learning places include folk high schools, community colleges, and lifelong learning centers. The practice is also often referred to as 'Training and Development'and is often associate with workforce or professional development. It has also been referred to as andragogy (to distinguish it from pedagogy). A difference is made between vocational education, mostly undertaken in workplaces and frequently related to upskilling, and non-formal adult education including learning skills or learning for personal development. Educating adults differs from educating children in several ways. One of the most important differences is that adults have accumulated knowledge and experience that can add to or hinder the learning experience. Another difference is that

Q.1: Describe the terms ‘Rest’ and ‘Motion’. Ans: Rest - A body is said to be at rest if it does not change its position with respect to its surroundings. For example, a table lying in a room is at rest with respect to the walls of the room. Motion -A body is said to be in motion if it changes its position with respect to its surroundings. For example, a car running on a road is in motion with respect to trees on roadside. Q.2: Describe the various types of motions observed in bodies. Ans: 1. Translatory motion - When a body moves as a whole along a straight or curved path, it is said to be in translatory motion. Translatory motion is of two types: (a) Rectilinear motion: Here a body moves as a whole along a straight path. For example, a train moving on straight rails has translatory rectilinear motion. (b) Curvilinear motion: Here a body moves as a whole along a curved path. For example, a bicycle taking a turn along a curved path. 2. Rotatory / Rotational motion - Wh

what is photosytheisis? the process in which green plants make there food whit the help of sunlight ,water,etc.. is called photosytheisis

Solid 1. They are rigid and incompressible. 2. Have definite volume and definite shape. 3. Minimum or no fluidity. 4. Can be stored without vessel. 5. Inter-molecular force of attraction is the maximum. 6. Least inter-molecular space hence, tightly packed. Liquid 1. Not rigid and can be compressed to a little extent. 2. Have definite volume but no definite shape. 3. Slippery and fluid. They flow from higher level to lower level. 4. Need vessel for storing. Open vessel can store. 5. Inter-molecular force of attraction is intermediate. It is lesser than solid and greater than gases. 6. Inter-molecular space is greater than solids but lesser than gases. Gas 1. These are not at all rigid and can be easily compressed. 2. Have neither definite shape nor volume. 3. Flow in all directions. Maximum fluidity. 4. Can be stored in a closed vessel only. 5. Inter-molecular force of attraction is the minimum. 6. Inter-molecular space is the maximum.

=> Characteristics of Solid - A solid are a state in which matter is characterized by having definite shape, distinct boundaries, rigidity, incompressibility and fixed volume. => Characteristics of Liquid - A liquid is a state in which matter is characterized by having fluidity, low compressibility, no definite boundary or shape but fixed volume. => Characteristics of Gases - The gaseous state are characterized by having fluidity, high compressibility, no definite boundary, volume or shape. => Melting Point is the temperature at which a solid becomes a liquid at atmospheric pressure. => Boiling Point is the temperature at which a liquid changes into its vapour at atmospheric pressure. => Latent Heat of Fusion is the amount of heat consumed when 1 kg of a solid changes into liquid at a constant temperature. => Latent Heat of Vaporization is the amount of heat consumed when 1 kg of a liquid changes into its vapour at a constant temperature. =>