Biology (Part-3) (CDS-Solved Paper)

The correct pathway for the elimination of urine is Kidneys→ Ureters → Urinary Bladder → Urethra
Kidneys are main excretory organs where urine formation occurs. Ureters are tube-like structures emerging from hilum of kidneys. Urinary bladder is a sac-like structure where urine is stored. Through urethra urine is discharged outside.

Cell membrane, cytoplasm and nucleus are the components or parts that are common to both plant and animal cells, whereas cell wall and chloroplast are strictly confined to plant cell only. Prominent vacuole is present in plant cell whereas animal cell contains multiple small vacuoles.

Only statement 1 is correct, rest are incorrect. Pulmonary veins deliver oxygenated blood from lungs to heart. Common hepatic artery supplies blood to the liver, pylorus, duodenum and pancreas. Renal vein carries the blood, filtered by kidney to the heart.

Marchantia belongs to group bryophytes. In bryophytes plants absorb water through general body surface. Bryophytes are amphibians of plant kingdom. They grow near water or in moist and shady places.

They cannot complete their life cycle without water, but they lack conducting tissues. In bryophytes, xylem and phloem are present.

Marsilea and fern belong to group pteridophytes which have xylem tissue for transport of water. Cycas belongs to gymnosperms which also have xylem, but vessels are absent.

Stomata is a tiny opening or pore that is responsible for transpiration. Air containing carbon dioxide and oxygen enter the plant through these openings where it is used in photosynthesis and respiration.

Also, water vapour gets into the atmosphere through these pores in a process called transpiratioin.

Some times small pores lenticels are also present. Xylem is responsible for conduction of water. Root absorbs water from soil and barks are dead covering in older plants.

Anorexia nervosa is an eating disorder characterised by immoderate food restriction, inappropriate eating habits or rituals, obsession with having a thin figure, and an irrational fear of weight gain, as well as a distorted body self-perception.

Fats are needed for the formation of cell membrane. Fats are present in the form of phospholipid. Phospholipid are the same as triglycerides except that one of the three fatty acid units is replaced by a molecule that contains phosphorus. Body cannot release energy in fats as quickly as the energy released in carbohydrates because fat first will have oxidise into carbohydrate in the form of acetyl Co-A for releasing energy. Vitamin-D is essential for absorption of calcium (Ca) and proteins are required for repairing of damaged tissue of the body.

Among the given options bug has only three pairs of legs. All the insects in phylum–Arthropoda have three pairs of leg. In given option only bug belongs to class–Insecta. Others have four pairs of legs belong to other class–Arachnida.

Both the statements (1) and (2) are correct. Amnion is a membrane, filled with fluid, closely covers the embryo which protects it from shock. The sex of the embryo may be determined by ultrasound as early as 11 weeks gestation.