Advertisements
Advertisements
प्रश्न
Fill in the blank.
Pollen grains are formed by ______ division in locules of anthers.
उत्तर
Pollen grains are formed by meiotic division in locules of anthers.
APPEARS IN
संबंधित प्रश्न
Describe, in brief, the changes the uterus undergoes
(i) to receive the zygote.
(ii) if zygote is not formed
List two functions ovary of human female reproductive system.
Suggest three contraceptive methods to control the size of human population, which is essential for the health and prosperity of a country. State the basic principle involved in each.
Explain how the embryo gets nourishment inside the mother’s body.
What are sexually transmitted diseases?
Describe in brief what happens to the zygote after it gets implanted.
Give appropriate biological/technical terms for the following:
The kind of twins formed from two fertilized eggs.
Describe in brief the structure of placenta
Give biological explanations for The placenta is an important structure for the development of a foetus
Which part of the human body produces ova?
What is the name of the process in which thickened uterus lining alongwith blood vessels is removed from the body of a human female through vaginal bleeding?
What are the male and female gonads in human beings? Mention their functions.
Mention two functions of human testes.
Mention two functions of human ovaries.
What is the scientific name of womb?
Describe the process of fertilisation in humans and development of embryo briefly.
What is ovulation? How often does it happen in human females?
What joins embryo to placenta in mother's body?
In human males, the testes lie in the scrotum outside the body because it helps in the
(a) process of mating
(b) formation of sperms
(c) easy transfer of sperms
(d) all the above
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 uterus becomes thick and soft with lots of blood vessels in it. When the egg cell gets fertilised by a sperm, then an event C occurs in the life of mature human female which lasts for time period y leading to the birth of baby. If, however, the egg cell released by the ovary does not get a sperm to fuse with, then the thick and soft inner lining of 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.
(a) What are A?
(b) What is process B?
(c) What is the time period x?
(d) Name the event C.
(e) How much is the time period y?
(f) What is the name of process D?
(g) Name the chemical substances E.
Explain how the transmission of virus and bacteria diseases be prevented?
Describe in brief the role of vas deferens in human male reproductive system.
Draw a diagram of human female reproductive system and label the part.
(i) That produces eggs.
(ii) Where fusion of egg and sperm take place.
(iii) Where zygote is implanted.
What happens to human egg when it is not fertilized?
Fill in the blank.
In humans, ------ chromosome is responsible for maleness.
In male and female reproductive system of human, ______ gland is same.
Give the name:
Methods of family planning.
What is reproduction? List its two types.
Choose the correct answer:
Binary fission is a method of __________
Give the functions of the following:
Vagina
What is sexual reproduction? What are its essential features?
What do you understand by an inguinal hernia?
Differentiate
Sexual Reproduction and Asexual Reproduction.
Mention, if the following statement is True or False. If false rewrite the wrong statement in its correct form:
Women after the age of 45 years normally cannot produce children.
Choose the Odd One Out:
The mature sperms are stored in the ____________.
The membranous cover of the ovum at ovulation is ______.
Reproductive organs are also considered endocrine glands.
