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Mention any two functions of the human foetal placenta.
Concept: Placenta (Growth) in Human
What is the significance of the testes being located in scrotal sacs outside the abdomen?
Concept: The Male Reproductive System
Match the items given in Column I with the most appropriate ones in Column II and rewrite the correct matching pairs:
| Column I | Column II | ||
| (a) | Leydig Cells | 1. | Lack of thyroxine in children |
| (b) | Stoma | 2. | 12 pairs |
| (c) | Ova | 3. | Testosterone |
| (d) | Cranial nerve | 4. | Diffusion of respiratory gases |
| (e) | Cretinism | 5. | Haploid cells |
| 6. | 31 Pairs | ||
| 7. | Diploid cells |
Concept: The Male Reproductive System
The diagram given below shows a section of the human ovary.
- Name the process for the release of the part labelled 1.
- Write the name of the structure marked 2.
Concept: The Female Reproductive System
Assertion (A): The foetus respires but does not breathe.
Reason (R): The maternal blood supplies oxygen to the foetus through placenta.
Concept: Placenta (Growth) in Human
Read the explanation given below and name the structure:
A cell formed by the fusion of gametes.
Concept: Parturition (Birth) in Human
State the difference between Micturition and Parturition.
Concept: Parturition (Birth) in Human
What is the significance of Testes being placed in Scrotal sacs?
Concept: The Male Reproductive System
The given statement is incorrect. Rewrite the correct statement:
Seminiferous tubules secrete Testosterone.
Concept: The Male Reproductive System
A biology teacher asked her students to give two examples of vestigial organs in the human body.
Raj said: Wisdom teeth and Pinna
Sonu said: Body hair and large intestine
Lata said: Vermiform appendix and wisdom teeth
Abhay said: Pinna and Ossicles
Who were correct?
Concept: Vestigial Organs
Name any two resources which come under pressure due to the rising population.
Concept: Rising Population - Pressure on Natural Resources
The prime source of chlorofluorocarbons is ______.
Concept: Ozone Layer Depletion
find odd one from following: Sewage, newspaper, Styrofoam, Hay.
Concept: Control of Pollution
Explain Biomedical waste
Concept: Environmental Issues >> Soil Pollution
Study the picture given below and answer the question:
Mention one control measure to stop the pollution of water bodies.
Concept: Control of Pollution
Name two harmful effects of noise pollution.
Concept: Environmental Issues >> Noise Pollution
Define the following term:
Noise
Concept: Environmental Issues >> Noise Pollution
The energy required to remove an electron from a neutral isolated gaseous atom and convert it into a positively charged gaseous ion is called ____________. (electron affinity, ionization potential,
electronegativity)
Concept: Periodic Properties >> Ionisation Potential (Ionisation Energy)
Arrange the following as per the instruction given in the brackets:
He, Ar, Ne (Increasing order of the number of electron shells)
Concept: Periodic Properties >> Electron Affinity
Arrange the following as per the instruction given in the brackets:
Na, Li, K (Increasing Ionisation Energy)
Concept: Periodic Properties >> Ionisation Potential (Ionisation Energy)
