How do Organisms Reproduce? quiz

Binary fission occurs in:

Multiple fission is seen in:

Which of the following shows vegetative propagation through leaves?

The part of a flower that develops into a fruit after fertilisation is the:

The site of fertilisation in human females is the:

Which of the following is a sexually transmitted disease?

The male reproductive part of a flower is the:

In human males, the testes are located outside the abdominal cavity in the scrotum because:

The Copper-T is a contraceptive device placed in the:

Spirogyra reproduces asexually by:

Why is variation important in the long run for a species? (2 marks)

How does binary fission differ from multiple fission? (2 marks)

How will an organism benefit if it reproduces through spores? (2 marks)

What are the advantages of sexual reproduction over asexual reproduction? (2 marks)

What is the role of the seminal vesicles and the prostate gland? (2 marks)

What changes are seen in girls at the time of puberty? (2 marks)

How does the embryo get nourishment inside the mother's body? (2 marks)

If a woman is using a Copper-T, will it help in protecting her from sexually transmitted diseases? Give a reason. (2 marks)

What happens to the zygote after fertilisation in a flowering plant? Name the parts that develop into the seed and fruit. (2 marks)

Why does menstruation occur? (2 marks)

Yeast cells in a sugar solution reproduce by budding, each cell producing one bud that separates every 90 minutes. Starting with 50 cells, how many cells will there be after 6 hours? Show your working. (3 marks)

In a germination experiment, 200 bean seeds were soaked and kept in moist cotton. After 5 days, 170 seeds had germinated. Calculate the germination percentage. Name two conditions needed for germination that the experiment provided. (3 marks)

Human gestation lasts about 280 days from the first day of the last menstrual period. Express this in weeks and in months (taking a month as 30 days). If a woman's last period began on 1 January (not a leap year), roughly when is the baby due? (3 marks)

A flower of a pea plant has 10 ovules in its ovary. If 80% of the ovules are fertilised, how many seeds will form in the pod? Explain why the number of pollen grains landing on the stigma must be at least as large as the number of seeds. (3 marks)

A fragment of Spirogyra filament with 6 cells breaks into 3 equal fragments, and each cell in each fragment divides once to lengthen the filament. How many cells are present in each new filament and in all filaments together? Name the mode of reproduction. (3 marks)

Read the passage and answer the questions. A farmer wants to grow banana, sugarcane and rose plants on his land. His friend advises him to use parts such as stems or roots rather than seeds. The friend says this gives plants that bear flowers and fruits earlier and are exactly like the parent plant. (i) What is this method of reproduction called? (ii) Give two advantages of this method. (iii) Why are banana and orange plants, which have lost the capacity to produce seeds, propagated only in this way? (5 marks)

Read the passage and answer the questions. Bread kept in a moist and warm place for a few days developed a cottony growth with tiny black dots. A student observed it under a microscope and saw thread-like structures with round blobs at their tips. (i) Name the organism and its mode of reproduction. (ii) What are the round blobs and what do they contain? (iii) Why does the organism grow well on moist bread? (5 marks)

Read the passage and answer the questions. In a flowering plant, pollen grains from the anther of one flower are carried by insects to the stigma of another flower. A pollen tube grows from the pollen grain through the style to reach the ovule. After fertilisation, the flower changes and a fruit is formed. (i) What is this type of pollination called? (ii) What happens to the male germ cell after reaching the ovule? (iii) Name the parts that the ovule, ovary and petals become after fertilisation. (5 marks)

Read the passage and answer the questions. A health worker in a village conducts awareness sessions on reproductive health for adolescents. She explains the changes during puberty, how infections can spread through sexual contact, and the importance of the right age for marriage. (i) Name two bacterial and two viral sexually transmitted diseases. (ii) Why is a mechanical barrier like a condom useful in preventing these diseases? (iii) Why is early pregnancy harmful to the health of a young mother? (5 marks)

Read the passage and answer the questions. The human female reproductive system has two ovaries that contain thousands of immature eggs at birth. At puberty, some start maturing, and one egg is produced every month by one of the ovaries. The uterus prepares itself every month to receive and nurture the growing embryo. (i) Where does fertilisation take place? (ii) What happens to the uterine lining if the egg is not fertilised? (iii) How does the embryo get attached to the uterus and what is the role of the placenta? (5 marks)

Describe the different modes of asexual reproduction with one example of each: binary fission, multiple fission, fragmentation, regeneration, budding, vegetative propagation and spore formation. Draw a labelled diagram of spore formation in Rhizopus. (6 marks)

Draw a labelled diagram of the longitudinal section of a pistil showing the growth of a pollen tube and its entry into the ovule. Describe the process of fertilisation in flowering plants and the changes that take place in the flower after fertilisation, leading to seed and fruit formation. (6 marks)

Draw a labelled diagram of the human male reproductive system. Describe the role of the testes, scrotum, vas deferens, seminal vesicles, prostate gland and urethra. What is the role of testosterone? (6 marks)

Describe the human female reproductive system with a labelled diagram. Explain the events from fertilisation to the development of the foetus, including implantation and the role of the placenta. What is the approximate duration of gestation in humans? (6 marks)

What is reproductive health? Explain the different methods of contraception, with one example and one disadvantage of each. Why is female foeticide a serious social problem, and how does it affect the sex ratio? Draw a simple chart showing the classification of contraceptive methods. (6 marks)