Biology

Q. If the female gamete carries 22+XX chromosomes, while male gamete is normal, predict the probable defects in the baby formed as a result of fusion between these gametes from the options given below.

i. Triple X syndrome
ii. Klinefelter’s syndrome
iii. Turner’s syndrome
iv. Edwards' syndrome
[1 mark]

1. i and ii
2. ii and iii
3. i and iv
4. iii and iv

Q.

Define nutrition.

Q.

Explain the importance of the conservation of resources?

Q.

How are oxygen and carbon dioxide transported in human beings?

Q.

Define land degradation. Explain with causes and control measures

Q.

What are the main causes of population growth in India?

Q.

What is spermatogenesis? Briefly describe the process of spermatogenesis.

Q.

Describe the important properties of enzymes.

Q.

Differentiate between microsporogenesis and megasporogenesis. Which type of cell division occurs during these events? Name the structures formed at the end of these two events.

Q.

What is the importance of photosynthesis?

Q.

Describe the various types of placentations found in flowering plants.

Q.

What are the characteristics of protozoa?

Q.

List the names of external and internal organs of your body.

Q.

Describe the function of heart.

Q.

If E. coli was allowed to grow for 80 minutes then what would be the proportions of light and hybrid densities in a DNA molecule?

Q.

List the three events that occur during the process of photosynthesis. Explain the role of stomata in this process

Q.

Explain the process of transcription in prokaryotes. How is the process different in eukaryotes?

Q.

Which is the smallest bone in the human body?

1. Stapes
2. Malleus
3. Incus
4. Femur

Q.

List out three methods of soil conservation.

Q.

What is oogenesis? Give a brief account of oogenesis.

Q.

In a cross between a male and female, both heterozygous for sickle cell anemia gene, what percentage of the progeny will be diseased?

1. 50%

2. 75%

3. 25%

4. 100%

Q. Two chambers, $A$ and $B$, containing solutions are separated by a semipermeable membrane.
$\left(a\right)$ Solution of which chamber has a lower water potential?
$\left(b\right)$ Solution of which chamber has a lower solute potential?
$\left(c\right)$ In which direction will osmosis occur?
$\left(d\right)$ Which solution has a higher solute potential?
$\left(e\right)$ At equilibrium which chamber will have lower water potential?
$\left(f\right)$ If one chamber has a $\Psi$ of $2000kPa$, and the other $1000kPa$, which is the chamber that has the higher $\Psi$?
$\left(g\right)$ What will be the direction of the movement of water when two solutions with ${\Psi }_w=0.2MPa$ and ${\Psi }_w=0.1MPa$ are separated by a selectively permeable membrane?

Q.

What is respiration?

Q.

What is the function of the stomach?

Q.

What are two major differences between prokaryotic and eukaryotic cell structures?

Q. During muscle contraction, which of the following shortens?
(i) A band
(ii) I band
(iii) Sarcomere

1. i and ii
2. ii and iii
3. i and iii
4. i, ii, and iii

Q.

What are the sub-stages of prophase I of Meiosis I? Explain briefly.

Q.

Explain mutation and its type in detail?

Q.

What is Biological Oxygen Demand (BOD)?

Q.

What is CPH4?