Yes, it is the correct answer. It is not a natural valve present in the heart but an artificial mechanical valve used by a doctor for a cardio patient.

No, gastric glands do not release amylase. It is produced by salivary glands. Hence, this is the correct answer.

Yes, this is the correct answer. Gravity pull will force the water downwards. The upward movement of water and minerals from roots to different plant parts is called ascent of sap.

Yes, Bowman's capsule is a cup-like sac at the beginning of the tubular component of a nephron in the mammalian kidney. The filtered blood is sent to the systemic circulation through efferent arteriole and the filtrate goes to the Bowman’s capsule.

Yes, it is correct. Planaria is the first animal which shows ‘eye’ like structure that are spots and light sensitive.

Yes, all of them have lumen. The opening in a tubular body structure that is surrounded by body tissue is known as lumen. It is present in the small intestine, aorta and esophagus.

Yes, it is correct. Number of chromosomes is halved during gamete formation. As a result, the number of chromosomes in gamete is half the number of chromosomes in somatic cells.

Yes, it is the correct answer. Meiosis creates sex cells, i.e. gametes with half the number of chromosomes.

Yes, the number of chromosomes remain the same. It is a process of asexual reproduction in which the cell divides in two producing a replica, with an equal number of chromosomes in each resulting diploid cell.

Yes, it is correct. No, it is incorrect. Diploid cell is produced after mitotic reproduction having 46, i.e. the original number of chromosomes. Haploid cells are produced after meiosis reproduction having half the number of chromosomes, i.e. 23. Diploid human cells are formed after fusion of two daughter haploid cells, hence 23 + 23 = 46 again.

Yes, all are correctly matched. Cerebellum controls the balance of body. Medulla controls various involuntary functions. Hypothalamus controls sleep and wake cycle (circadian rhythm) of the body, cerebrum is the seat of learning and memory.

Yes, it is correct. The secretion of this gland lubricates the urethra before ejaculation and neutralizes the acidic traces of urine in the urethra by Cowper's in males and Bartholin's in females.

Yes, it is correct. The fragments of the lining are shed along with blood and the discarded egg; through the vagina. The discharge of discarded tissues is called menstrual flow and the process is called menstruation.

Yes, it is correct. Spirogyra can reproduce both sexually and asexually. Spirogyra reproduces asexually by filaments breaking into smaller bits. Plasmodium reproduces by multiple fission. Yeast shows budding and paramecium reproduces by binary fission, when it reproduces asexually.

Yes, it is correct. Yeast grows very slow in plain water as there are very less nutrients present than in the sugar solution, which has sufficient amount of nutrients for yeast to grow. High temperature does not support yeast growth.