NEET Test 64

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NEET Test 64

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Weekly Quiz Competition

Question 1
4 / -1

The enthalpy change involved in the oxidation of glucose is -2880 kJ/mol and 25% of this energy is available for muscular work. If 100 kJ of muscular work is needed to walk 1 km, then what is the maximum distance that a person will be able to walk after consuming 120 g of glucose?

A
9.7 km

B
7.9 km

C
8.4 km

D
4.8 km

Solution

Explanation:As the energy available for muscular work on consumption of 180 g of glucose is 2880 × 25 / 100 = 720 kJ/mol

So, the energy available for muscular work after consuming 120 g of glucose = 720 × 120 / 180 = 480 kJ/mol As 100 kJ is used for walking 1 km,

So, 480 kJ is sufficient for walking = 1 × 480 / 100 = 4.8 km
Question 2
4 / -1

If root of a flowering plant has 24 chromosomes, then its gamete has

A
24 chromosomes

B
12 chromosomes

C
4 chromosomes

D
8 chromosomes

Solution

The root cell of a flowering plant is diploid (2n = 24) while the gamete is haploid. Therefore, the number of chromosomes becomes 12 in the gamete.

The cells of stem, leaf and somatic cells of a flower are diploid. Therefore, they contain the chromosome number 2n = 24.
Question 3
4 / -1

Which cells are found only in sponges?

A
Amoeboid cells

B
Choanocytes

C
Pigment cells

D
Gland cells

Solution

Choanocytes are found only in sponges. The choanocyte is an ovoid cell with free ends bearing a transparent contractile collar. The collar surrounds a single, long flagellum. Choanocytes are used in feeding and for ensuring flow of water within the animal's body.
Question 4
4 / -1

The animal with bilateral symmetry in young stage, and radial pentamerous symmetry in the adult stage belongs to which phylum?

A
Annelida

B
Mollusca

C
Cnidaria

D
Echinodermata

Solution

Echinoderms are triploblastic animals with organ system level of organisation. Larval forms possess bilateral symmetry while adults have radial symmetry.

Annelids are bilaterally symmetrical animals, for example, nereis, aphrodite.

Molluscs are bilaterally symmetrical animals, but snails are asymmetrical.

Cnidarians (coelenterates) are radially symmetrical animals with tissue grade of body organisation.