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प्रश्न
How can plants and animals save themselves from extinction?
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उत्तर
Genetic variation helps the organisms to adjust with the changing environment and thereby to maintain their existence. Due to this, plants and animals can save themselves from being extinct.
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संबंधित प्रश्न
Define the Zygote.
Choose the odd one in each of the following:
Sperm; implantation; fertilization; ovum; afterbirth
State whether the following statement is true or false:
Fertilization occurs in the vagina.
What happens to uterus if fertilization takes place? And what happens to uterus if fertilization does not take place?
Define the following:
Ovulation
The figure given below represents the female reproductive system of a mammal.
What will happen if the part B on both sides gets blocked?
What is fertilization? Name the site of fertilization in the human females.
Name two essential structures which take part in fertilization.
How is the fetus protected?
Give Reasons
Millions of sperms are produced at ejaculation yet one sperm actually fertilizes the ovum. Explain.
Give Reasons
The acrosome of sperm secretes an enzyme called hyaluronidase at the time of fertilization
Complete the following sentences with appropriate word:
___________ hormones are secreted by the interstitial cells.
Multiple Choice Question:
Ovulation in mammals is a process in which
Explain the process of fertilization.
What is fertilization?
Identify the function of fertilization membrane.
What are autosomes chromosomes?
Which hormones are called neurohypophyseal hormones?
Match the items in column I with those in column II and write down the matching pairs (some may not match).
| Column I | Column II | ||
| (a) | Acrosome | (i) | An embryo which looks like human baby. |
| (b) | Gestation | (ii) | Luteinizing hormone |
| (c) | Menopause | (iii) | Ovum producing cells. |
| (d) | Foetus | (iv) | Semen |
| (e) | Oogenesis | (v) | Spermatozoa |
| (f) | Ovulation | (vi) | Complete stoppage of menstrual cycle. |
| (vii) | Time taken by a fertilised egg till the delivery of baby. |
Write the specific location of the following:
Acrosome
