P-1 Lenses — Science STD 10 — Question

(Luteinizing hormone, endometrium of uterus, follicle stimulating hormone, estrogen, progesterone, corpus luteum)
Growth of follicles present in the ovary occurs under the effect of ………….. This follicle secretes estrogen. Ovarian follicle along with oocyte grows/regenerates under the effect of estrogen. Under the effect of ………….., fully grown up follicle bursts, ovulation occurs and …………….. is formed from remaining part of follicle. It secretes ……………. and ………. Under the effect of these hormones, glands of ……….. are activated and it becomes ready for implantation.

Write the demerits of Mendeleev's periodic table.

What is a neuron? Draw a labelled diagram of a neuron.

The filament of a lamp is 80cm from a screen and a converging lens forms an image of it on a screen, magnified three times. Find the distance of the lens from the filament and the focal length of the lens.

Find the focal length of a convex lens which produces a virtual image at 10 cm from the lens when an object is placed at 5 cm from the lens.

Using electron-dot diagrams which show only the outermost shell electrons, show how a molecule of nitrogen, N, is formed from two nitrogen atoms. What name is given to this type of bonding? (Atomic number of nitrogen is 7)

Why is it essential to get the training of first aid? (July ’19)

The near point of a long-sighted person is 50cm from the eye:

1. Can she see clearly an object at:

1. A distance of 20 cm?
2. At infinity?

2. To read a book held at a distance of 25cm, will she need converging or diverging spectacle lenses?

Which precautions are necessary for proper decomposition of domestic waste?