1. Eggs starts developing in human female ?

After the first menstruation

Only after her birth

When she is in her mothers womb

When she attains puberty

Answer: When she is in her mothers womb

Explanation:


2. Male reproductive organ in flowering plant is ?

Ovary

Stamen

Corolla

Carpel

Answer: Stamen

Explanation:


3. Where does fertilisation take place ?

Cervix

Fallopian tube

Vagina

Uterus

Answer: Fallopian tube

Explanation:


4. The embryo in humans gets nutrition from the mother’s blood with the help of a special tissue called ?

Womb

Uterus

Placenta

Villi

Answer: Placenta

Explanation:


5. In a potato, vegetative propagation takes place by ?

grafting

leaf

root

stem tuber

Answer: stem tuber

Explanation:


6. A feature of reproduction that is common to amoeba, spirogyra and yeast is that ?

They are all multicellular

They reproduce only sexually

They are all unicellular

They reproduce asexually

Answer: They reproduce asexually

Explanation:

Amoeba and yeast are unicellular while spirogyra is multicellular. But all the three reproduce asexually.


7. In human males, the testes lie in the scrotum, because it helps in the ?

Formation of sperm

Process of mating

All the above

Easy transfer of gametes

Answer: Formation of sperm

Explanation:

Formation of germ cell or sperms take place in the testes and it lies in the scrotum. In the scrotum outside the abdominal cavity, the temperature is about 3 degree Celsius lower than the temperature of the body. Testes lies in the scrotum because the sperm formation require a lower temperature than the normal body temperature.


8. A pair of duct arising from testis, which carry sperms are ?

urethra

oviduct

vas deferens

fallopian tube

Answer: vas deferens

Explanation:


9. Vegetative propagation refers to formation of new plants from ?

Stem, leaves and flowers

Stem, flowers and fruits

Stem, roots and leaves

Stem, roots and flowers

Answer: Stem, roots and leaves

Explanation:

In vegetative propagation, vegetative parts of a plant such as root, stem leaf, etc. can produce new plants. Vegetative reproduction is seen in plants like orchids, ornamental plants, grasses, banana, rose, jasmine etc.


10. An unisexual flower ?

Has either petal or sepal

Do not have carpel

Has either carpel or stamen

Do not have stamen

Answer: Has either carpel or stamen

Explanation: