Lakhmir Singh and Manjit Kaur Solutions for Chapter: How Do Organisms Reproduce, Exercise 10: Questions Based on High Order Thinking Skills (HOTS)

When a female child is born, her ovaries already contain thousands of immature eggs (or ova) contained in immature structures A. On maturing, A bursts open and an egg shoots out of the ovary in a process called B. The process B starts in the females at puberty and occurs again and again after a time period x. Before every occurrence of process B, the inner lining of the uterus becomes thick and soft with lots of blood vessels in it. When the egg cell gets fertilised by a sperm, then event C occurs in the life of a mature human female which lasts for a time period y leading to the birth of a baby. If, however, the egg cell released by the ova does not get a sperm to fuse with, then the thick and soft inner lining of the uterus breaks down and comes out of the female's body in an event called D. The occurrence of event D is controlled by chemical substances E.

Name the chemical substances E, whether it is enzymes or hormones?

A woman uses a device X made of common metal for preventing pregnancy. This device works by preventing the implantation of the fertilised egg cell (or embryo) in the female organ Y. Name the organ Y.

A, B and C are three common STDs. A and C are caused by bacteria whereas B is caused by a virus D. The virus D reduces the immunity of the infected person to such a low level that the person can die of even very mild diseases. Name virus D.

The germ cell A produced by a person X is round in shape and it fuses with another germ cell B having a long tail and produced by a person Y. The fusion of A and B produces a new cell C. The cell C divides repeatedly and grows inside the organ D of person X to form E in which the body features of the unborn baby are not much developed. E grows further to form F in which the various body features of the unborn baby (like hands, legs, head, eyes, and ears, etc.) can be identified. F grows further and ultimately forms a baby. What are A, B, C, D, E and F? Out of the two persons X and Y, which one is male and which one female?

Explain why a human zygote is more likely to grow into an adult than a frog zygote.

In a bisexual flower, inspite of the young stamens being removed artificially, the flower produces fruit. Explain.

In what ways is fertilization in a plant similar to fertilization in a human?

In what ways is fertilization in a plant different from fertilization in a human?