Advertisements
Advertisements
प्रश्न
Give biological explanations for All the food chains begin with green plants.
Give biological explanations for the following:
All the food chains begin with green plants.
Advertisements
उत्तर
Green plants are the only organisms that are able to synthesise food from CO2 and H2O in the presence of chlorophyll and sunlight. However, animals depend upon plants for food. Therefore, all food chains begin with green plants.
APPEARS IN
संबंधित प्रश्न
Find the odd one out and write it: vagina, uterus, vas deferens, ovary
Describe the function of placenta.
How many pairs of chromosomes are present in human beings? Out of these how many are sex chromosomes?
The diagram shows female reproductive system. Name the parts labelled A to D.
(a) In which part do the sperms enter?
(b) Which part releases the egg?
(c) In which part does fertilisation take place?
(d) In which part does the foetus develop?
Explain why, fertilisation is possible if mating takes place during the middle of menstrual cycle.
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.
Trace the path of sperms from where they are produced in human body to the exterior.
Write the functions of secretions of prostate gland and seminal vesicles in humans.
The vagina is a muscular tube.
Complete the following statement by choosing the correct alternative:
Sterilization in female is due to cutting off of ______.
