Sickle-cell anemia is a disease caused due to the abnormality in

• white blood cells

• red blood cells

• thrombocytes

• blood plasma composition

132.

Carbohydrates are stored in plants and animals in the form of

• cellulose and glucose respectively

• starch and glycogen respectively

• starch and glucose respectively

• cellulose and glycogen respectively

Which of the following statements regarding oxidation and reduction are correct?

1. In oxidation, loss of electron takes place whereas, in reduction, a gain of electron takes place.
2. In oxidation, a gain of electron takes place whereas, in reduction, loss of electron takes place.
3. Oxidizing agent decreases the oxidation number but reducing agent increases the oxidation number.
4. Oxidizing agent increases the oxidation number but reducing agent reduces the oxidation number.

Select the correct answer using the code given below:

• 1 and 3

• 2 and 4

• 2 and 3

• 1 and 4

Certain parts of a plant can be bent easily without breaking. This flexibility in certain parts, like leaf and stem, can be attributed to the abundance of

• parenchyma

• collenchyma

• sclerenchyma

• xylem and phloem

Which of the following is not a micronutrient for a plant?

• Iron

• Magnesium

• Molybdenum

• Manganese

Which of the following statements is/are correct?

1. Ligaments are highly flexible.
2. Ligaments connect muscles and bones.
3. Ligaments contain very little matrix.

Select the correct answer using the code given below:

• 1,2 and 3

• 1 and 3 only

• 2 and 3 only

• 1 only

The cell membrane is selectively permeable because

• it is made up of selected organic molecules

• it does not allow transport of some substances from region of higher concentration to the region of lower concentration

• the movement of organic molecules occurs only at a specific concentration

• it allows the movement of certain molecules in and out of the cell while the movement of other molecules is prevented

A biogeographic region with a significant reservoir of biodiversity that is under threat from humans is called

• bioendangered region

• biodiversity hotspot

• biodiversity reservoir

• environmentally endangered region

The main function of the inner bark of a woody plant is to

• transport minerals and water from the roots to the leaves

• act as a membrane·impermeable to water and gas

• transport food from the leaves to the other parts of the plant

• protect the plant from herbivorous animals

Birds like Flamingos can stand on one leg. Which among the following statements relating to this is/are correct?

1. By standing on one leg Flamingos can conserve body heat and energy because they can reduce a great deal of surface area for the loss of heat.
2. By standing on one leg, one Flamingo makes a courtship display, which is a part of ritual prior to reproduction.

Select the correct answer using the code given below:

• 1 only

• 2 only

• Both 1 and 2

• Neither 1 nor 2