Advertisements
Advertisements
प्रश्न
The eggs of frogs do not have shells for protection, yet they are safe in water, how?
Advertisements
उत्तर
Frog’s eggs are without any external covering or shell but a layer of jelly hold the eggs together, thus providing them protection.
This jelly or gelatinous covering also protects them from drying up and prevents them from being eaten up by other animals or predators.
APPEARS IN
संबंधित प्रश्न
The following diagram represents the vertical sectional view of the human female reproductive system.
How does the uterus prepare for the reception of zygote?
The following diagram represents the vertical sectional view of the human female reproductive system.
What happens to the uterus, if fertilization fails to take place?
Give Reasons
A large number of sperms are required for fertilizing one egg.
Differentiate between tubectomy and vasectomy.
Study the diagram given below and then answer the questions that follow:
(i) Name the part labeled A. Name any two hormones produced by the part labeled A.
(ii) What happens to the part labeled B.
(1) if fertilization takes place?
(2) If fertilization does not take place?
(iii) Where does fertilization occur?
(iv) Draw a neat diagram of the human sperm as seen under high magnification and label the following parts.
(1) Acrosome
(2) Mitochondria
Mention, if the following statement is True or False. If false rewrite the wrong statement in its correct form:
Fertilization is the product of the egg nucleus and the sperm nucleus.
What is sex chromosomes?
Name the parts of fallopian tubes.
Explain tubectomy and vasectomy.
What is the location and nature of antifertilizin?
