human body activities for middle school

The penetration of the sperm activates the egg and initiates a series of changes in the egg cortex and in the egg cytoplasm. Ovulation in the human female occurs at the secondary oocyte stage in which meiosis - I has been completed and the first polar body has been rel..

Complete the following table by measuring the interior and exterior angles of the figure given above using a protractor. Study the table carefully and identify the relation between exterior and interior opposite angle..

Introduce a burning jet of hydrogen into a jar of chlorine. Hydrogen continues to burn, forming hydrogen chloride (Fig.5.2)...

Remove air from a can by putting a little water into the can and boiling the water in it. The steam forces the air out. Close the opening and keep it below a tap, we find the can crumbling as the pressure inside the can is very small when compared to the pressure outside. ..

Draw a scalene triangle, an acute angled triangle, an obtuse angled triangle, an equilateral triangle and a right angled triangle. Measure the angles in all the figure. Enter the measure in the table given. What do you observe? What do you conclude with respect to the sum of the magnitudes of all ..

Take a thin layer of tissue from the lower surface of the leaf. Mount it on a slide in water and examine under a microscope. You will find tiny pores or stomata along with the epidermal cells. The stomata are bound by a pair of guard cells whose concave sides face each other. It is through the stom..

Take a nichrome wire of about 50 cm length and apply a potential difference of 1.5 V from a battery. Measure the current flowing through the wire using an ammeter connected to it in series, and note the potential difference across the resistance using a voltmeter connected across it. Note down and ..

Draw a triangle ABC. Mark the mid-points of BC, AC and AB as D, E and F respectively. Join AD, BE, CF. AD, BE and CF are the three medians of D ABC. They pass through (or meet) at the same point (or common point). G is the point of concurrence of the medians. It is called as centroi..

In a transparent combustion tube, cotton wool dipped in concentrated hydrochloric acid and liquor ammonia is introduced separately from the two ends of the tube. Both the ends of the combustion tube are then closed with rubber stoppers (Fig.5.6)...

Take two glass jars A and B. Collect sulphur dioxide gas in jar B and let jar A contain air. Carefully invert jar B containing sulphur dioxide, over the jar A containing air. Keep it for a few minutes (Fig. 7.3). Remove jar B and put a filter paper strip dipped in acidified potassium dichromat..