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Which of the numbered structure secretes a hormone that controls ovulation in females?

Biology

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Answer

B

Step-by-step solution

22 steps

Here are the solutions to the questions:

Part 10· 2 steps

  1. Analyze the diagram.

    The arrow labeled "3" shows water moving from the clouds to the Earth's surface.

  2. Identify the process.

    This process is known as precipitation, where water falls from the atmosphere in forms like rain, snow, or hail.
    The correct option is B.

    • B) Precipitation

Part 11· 2 steps

  1. Recall the structure of the heart.

    The right atrium receives deoxygenated blood and pumps it into the right ventricle.

  2. Identify the valve between the right atrium and right ventricle.

    This valve is the tricuspid valve, which prevents the backflow of blood into the right atrium when the right ventricle contracts.
    The correct option is D.

    • D) Tricuspid valve

Part 12· 2 steps

  1. Consider the function of fins in bony fish.

    Different fins serve different purposes.

  2. Identify the fin responsible for propulsion.

    The tail fin (caudal fin) is primarily responsible for generating thrust and enabling forward movement in fish.
    The correct option is D.

    • D) Tail fin

Part 13· 2 steps

  1. Recall the stages of human reproduction.

    After fertilization, the embryo travels to the uterus.

  2. Identify the site of implantation.

    The embryo implants itself in the wall of the uterus, where it continues to develop.
    The correct option is D.

    • D) Uterus

Part 14· 2 steps

  1. Identify the numbered endocrine glands in the diagram.

    1: Pituitary gland
    2: Thyroid gland
    3: Adrenal gland
    4: Pancreas
    5: Ovary

  2. Determine which gland secretes hormones that control ovulation.

    The pituitary gland (1) secretes Follicle-Stimulating Hormone (FSH) and Luteinizing Hormone (LH), which are crucial for controlling the ovarian cycle and triggering ovulation.
    The correct option is A.

    • A) 1

Part 15· 2 steps

  1. Consider the function of structures within a joint.

    The elbow joint involves the articulation of bones.

  2. Identify the structure that reduces friction.

    Cartilage covers the ends of bones in synovial joints, providing a smooth, slippery surface that reduces friction during movement.
    The correct option is A.

    • A) Cartilage

Part 16· 2 steps

  1. Recall the structure of a neuron (nerve cell).

    A neuron consists of a cell body, dendrites, and an axon.

  2. Identify the part that conducts impulses away from the cell body.

    The axon is the long, slender projection that transmits electrical impulses from the cell body to other neurons or effector cells.
    The correct option is A.

    • A) Axon

Part 17· 2 steps

  1. Consider the path of digested food nutrients.

    After absorption from the small intestine, nutrients are transported to the liver for processing.

  2. Identify the blood vessel that carries nutrient-rich blood from the digestive organs to the liver.

    This vessel is the hepatic portal vein.
    The correct option is A.

    • A) Hepatic portal vein

Part 18· 2 steps

  1. Recall the characteristics of Spirogyra.

    Spirogyra is a type of green algae, which means it is photosynthetic and performs autotrophic nutrition.

  2. Identify the organelle responsible for photosynthesis.

    Chloroplasts are the organelles in plant and algal cells where photosynthesis takes place.
    The correct option is B.

    • B) Chloroplast

Part 19· 2 steps

  1. Recall the structures of the respiratory system in the lungs.

    Air travels through the trachea, bronchi, and bronchioles.

  2. Identify the specific site of gaseous exchange.

    The alveoli are tiny air sacs at the end of the bronchioles where oxygen diffuses into the blood and carbon dioxide diffuses out.
    The correct option is D.

    • D) Alveolus

Part 20· 2 steps

  1. Analyze the given food chain

    Sun → maize → goat → lion.

  2. Determine the trophic level of each organism.

    • Maize is a producer (it makes its own food using sunlight).
    • Goat eats maize, so the goat is a primary consumer.
    • Lion eats goat, so the lion is a secondary consumer. The correct option is C.
    • C) Primary consumer
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