621. In females, the uterus is __________.

1. Single
2. Double
3. Triple
4. Four

Option “1” is correct.
In females, the uterus is single.
622. Azadirachata indica is the scientific name of-

1. Neem
2. Teak
3. Silver Oak
4. Tulsi

Option “1” is correct.
Azadirachta indica, commonly known as neem, nimtree or Indian lilac, is a tree in the mahogany family Meliaceae.
623. Octopus belongs to the phylum-

1. Mollusca
2. Cnidaria
3. Echinodermata
4. Chordata

Option “1” is correct.
Octopus belongs to the phylum Mollusca.
624. Which of the following animals does not have nervous system?

1. Leech
2. Tapeworm
3. Sponges
4. Snail

Option “3” is correct.
Sponges doesn’t have nervous system present in their body.
625. In which vertebrate oxygenated and deoxygenated blood gets mixed?

1. Fish
2. Amphibian
3. Bird
4. Mammal

Option “2” is correct.
In amphibian oxygen and deoxygenated blood get mixed.
626. Photosynthesis occurs in-

1. Nucleus
2. Mitochondria
3. Chloroplast `
4. Peroxisome

Option “3” is correct.
Photosynthesis takes place primarily in leaves and partially in stems. It takes place within specialized cell structures called chloroplasts. A leaf has a petiole or the stalk and a lamina, the flat portion of the leaf. As its area is broad, the lamina helps in the absorption of sunlight and carbon dioxide during photosynthesis. Photosynthesis takes place in the chloroplasts that have chlorophyll present in them. It is the chlorophyll that has chlorophyll present in them. It is the chlorophyll that absorbs light energy from the sun. There are tiny pores called stomata that function as roadways for carbon dioxide to enter and oxygen to leave the plant.
627. Which among the following pairs is not correctly matched?

1. Thiamine – Beri-beri
2. Vitamin D – Rickets
3. Vitamin K – Sterility
4. Niacin – Pellagra

Option “3” is correct.
Napthoquinone is the chemical name of Vitamin-K. It is known as anti-hemorrhagic factor. Its sources are green leaves, egg, liver & intestinal bacteria etc. Sterility is related with deficiency of vitamin E.
628. Which of the following converts milk into curd?

1. Bacteria
2. Vitamin
3. Enzyme
4. None of the above

Option “1” is correct.
Milk contains protein casein. This protein gives milk its characteristic the white colour. The curd forms because of the chemical reaction between lactic acid bacteria and casein.
629. Which one of the following cells produces antibodies?

1. Eosinophil
2. Monocyte
3. Basophil
4. Lymphocytes

Option “4” is correct.
Antibodies are produced by specialized white blood cells called lymphocytes.
630. Anemophily’ is pollination by :

1. Birds
2. Wind
3. Ants
4. Bats

Option “2” is correct.
Anemophily or wind pollination is a form of pollination whereby pollen is distributed by wind.
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